The wiring diagram shows which terminals to check. However, they charge money for their services. Try the emergency-flashers and if the lamp still does not light, bulbs or sockets are the very likely cause. The two corner stop lights at the back are NOT the same as the two tail lights. If you want to find a fast troubleshooting guide, click here. Step 3 Hello I’m Magnus, the owner and the writer of this website. (In rare situations, some cars use ground through the brake pedal switch, and this makes this more complex). A blue wire connects the brake lights switch to the rear lamps junction block. Service data for the vehicle in question will normally identify the type. You can also win a free AGCO coffee cup, by reporting any errors you find, with this form. If you don’t – there might be a broken fuse or a broken wire. If the bulb used in the brake light has gone faulty, it will not work when you depress the brakes. Usually one said "stop" and the other said "brake" and one was in the … The emergency flashers often use the same wiring, bulbs and sockets as the brakes. You might have sparse knowledge of electronics and rather than solving the problem, you could elevate it. Third Brake light not working I have a 2013 JKU, and for about 3 weeks I have been driving around without my third brake light (partly because I was not aware). On vehicles where the flashers are separate from the brake lights, this will not apply. There are good videos on YouTube of how to do this. Goes through a plug then to the led third light. This is not the case in every car, so check a wiring diagram to see if the wires go through the turn signal switch. One for the top/center stop lamp and another for the rear left and right brake lights. If that is the case then there is some other problem haunting you. Modern cars have two or more fuse boxes. They are in place so other drivers can spot you from behind and so that they can brake at a safe distance from you if you stop. If no lights illuminate at all, the issue is with the fuse. With a bad turn-signal switch, the third-light should still function. Only a few things normally account for brake lights staying on. When i step on the Brake, The third light goes on but, the sides do not light up. A bad brake switch is a really common problem when your brake lights are not working. Undo the cover using a set of screwdrivers and remove the bulb by pressing and turning, then check to see if it has blown out. In this position, the brake light switch changes to an open-circuit. The Electrical Ground. If it did not, the lights would stay on and not flash. Substitute a known good bulb, from the other side, to verify bulbs that cannot be confirmed otherwise. I bought new light coverings and they work just fine. You can test the brake light switch with a multimeter to make sure the pins get connection/0 ohm when you are pressing or releasing the switch. Some vehicles may have multiple switches on the brake pedal, and some switches may have more than one set of contacts. But if you have an older car, you want to check the light bulbs. Here are two links. These must normally be replaced as an assembly and are not serviceable. So if one of the three stop lights works when the pedal is depressed, the switch is working. I have been working with cars since I was 16 and I’m specialized with in-depth Automotive diagnostics. Many modern third-brake lights use an LED and do not have bulbs that can be replaced. With only two terminals, continuity should show in one position and an open circuit in the other. After replacing the switch in the column, the brake lights worked beautifully for some time until recently. No matter what your problem, there is a reason for it and there is a solution. In rare cases, there might also be a broken wire somewhere. In rare instances, the brake booster may fail, and the pedal will not rise enough to contact the switch. Now back up, sugnal, and tsil lights works, but NO Brake Lights. Mechanics also have the proper equipment to test and solve your brake light issue. When we depress the brake, the red wire shows 12 volts, because current is flowing. I do have the 3rd brake lights. How often should you change your brake pads? You can also receive our Detailed Auto Topics, delivered to your computer, as soon as they are written, please subscribe to our RSS feed. The procedure is repeated, dividing the circuit in half, until the problem is found. The first, the guy shows the location and basic overview of the brake … Test the switch, as described above, except there should be continuity when the switch activated. If the brake light switch is functional, you have to check for a bad electrical … If the inoperative third light flashes, with the emergency flashers, a fuse is the most likely cause. A wiring diagram and ohmmeter are needed. When they do, this guide can help find the problem. The problem is that you cannot often tell if your taillights and brake lights are faulty. It'll tell you the connector at the BCM and the wire color or pin number. Pushing the probe into a light socket will spread the contacts and cause the socket to fail. If the brake switch was bad, the 3rd brake light would not work. A bad brake switch is a really common problem when your brake lights are not working. This can be a real struggle to find since the wiring from inside the brake light system might go from the front of the car to the rear. And on most vehicles, the brake light system is usually a simple circuit that includes a brake light switch, the light bulbs or lamps, a fuse, and the wiring that connects these devices. A lack of power or ground shows the first half holds the problem. But sometimes there are occasions where one of them works and the other doesn’t. With the brakes still applied, less than 0.1 volts should show on the black wire, when checked to the body ground. 2001 Chevy Impala rear brake lights are not working. I noticed some white stuff on the socket and the bulb turned to black. We will find out below that there are a few reasons that this can happen. Please read, "Tips on  Automotive Electrical Testing," for more information. There is no light on the dash telling me so, and besides I find it hard to believe all 3 went out at once. In some vehicles, the brake light switch is powered through a single circuit that also includes the turn signal light. Identify the correct fuse and replace it with a similar one. The third brake light does not flash with turn signals. The basic procedure is to start at one end of the circuit and check for voltage and ground. If you have both ground and voltage – your bulb is broken or there is corrosion. Using these tools properly is very important. If not – you have a broken brake pedal switch. Chances are that this action will solve your problem. Lower Brake Lights Work, but Third Brake Light Does Not. Press the brake pedal and they come on, release, and they go off. So replaced the bulb and still not working. If you need to you can login here or register here. If you have 12 volts to the brake pedal switch – check if you get 12 volts out when you are pressing the switch. Check if you have 12 volts to the brake pedal switch. It's primarily a problem with the turn signal switch since the hazards and stop lights both are on the same circuit. Honda, Toyota and many other vehicles use these rubber pads and have this problem. Other things use that ground when the key is on so its not strong enough then to activate the armature within the relay. If you question that at all, confirm the back up lights work. Look in the trunk (if applicable). Pressing the pedal should cause the switch to move. Yes Checked Bulbs, The two Lower back Lights Work. On this type system, the turn signals and brakes use the same circuit. I tried checking the fuse under the hood and on side of the door. The point of the tool probe should only touch the contact, when checking. These are sometimes used by the cruise control, transmission and other systems. The Wiring Diagram Show a common Point Connector to look at, I Just Don't know where the Connectors are Located. No reverse lights either. There is often one below the dashboard and there is one under the hood. A mechanic, on the other hand, is qualified to do such jobs. A brake light out on one side only is most often a bulb or socket problem. I thought this was a great opportunity to order a new LED brake light, but it did not correct the issue. The brake-lamp portion of the switch will show continuity when the brake pedal is depressed. Many vehicles have small plastic pads, where the switch contacts the pedal, when released. The third (upper) brake light is working. Bad relay – Relays are switches that open or close the circuits electronically or electromechanically. If these pads break or fall out, the pedal may not push the switch enough when released. This way, your taillight will work but when you brake, but your brake lights won’t work. It looks like if that fuse isburned out, that would still let the third brake light work. The top light still works, but the bottom 2 do not work at all. This is a strange problem since essentially the connections for both lights come from the same source. Check if you have ground to the light bulb. Power and ground here, means the problem is in the second half of the circuit. In the illustration above, assume the red wire is the power lead for the brake lights and that the black wire is the ground for the circuit. This moisture can give birth to rust which can disrupt the entire electronic circuit. Inspect sockets closely for signs of discoloration, distortion or corrosion on the contacts. I have an 07 Jeep patriot doing the same thing. Unplug that plug with the blue wire and check for 12 volts when brake pushed there. If no 12 on blue wire oh boy. … I have no idea what is causing this problem. Then to rectify the problem, you would have to pay more for the parts. Assuming you have already replaced the bulbs, there is a switch that the brake pedal touches when depressed that activates the lights. That leads us to the second reason why you could end up in this situation. If continuity is indicated when released, or open-circuit shows when depressed, replace the switch. If 12 there to ground check the light ground point which is white wire with black stripe screws to hatch door frame right above license plate. Many things can and do go wrong. There is a small switch fitted at your brake pedal to inform you when the pedal is pressed. Unplug the brake-light switch and if the lights stay on, a short circuit is the case. If the truck your working on uses the turn signal filament in the same bulb as the brake light check from the turn signal switch as the brake light circuit goes through the signal switch. Jim, common problem. I couldn’t get my brake lights to work even though my tail lights and Signal lights. A broken wire to or from the switch may also cause the lower brake-lights not to work. Ok so I went for an inspection sticker and they told me my third brake light was out. When we use the turn signal switch, it cancels the brake light signal, on the side selected. A volt ohm meter or a LED test light will be needed for some tests. If ground is lost, but if that was the case, none of the lights would work. The brake lights and taillights are often comprised of one light bulb, but they work differently. In such cases, it is always best to consult the vehicle’s user manual or, if you have some money to spare, a mechanic. We are owned and operated by, Why Your Brake Lights Are Not Working, But the Tail Lights Are, Reasons Why Your Brake Lights Are Not Working, Car Dashboard Warning Lights & Symbols - Meanings, 5 Reasons Why Your Radiator Fan Is Not Coming On, Why You Should Replace Your Cabin Air Filter In Time, How to Change Brake Pads With an Electric Parking Brake. Be certain to seal any area check in this manner as the damaged wire may cause future problems. More voltage shows high resistance in the ground circuit. Did you figure out the problem? Want Answer 0. If the third brake light flashes, then most likely a fuse has gone bad. With the pedal released, the brake-light switch should be pushed to its full off position. One of the more common is a bad brake-light switch. A voltage present between the wires and a ground means continuity on the ground wire should be checked. A blown or fused bulb is the most basic reason behind a faulty brake light. All electronic equipment in a car is supplied electricity through wires that go through a fuse box. Good fuses mean the most likely cause is the brake-light switch. I bypassed stop light switch and have replaced turn signal switch. Posted by josephpata on Mar 14, 2009. I noticed this morning that none of my 3 brake lights are working. There is a high chance that due to an electrical surge, the brake light fuse has blown off. If your third brake light works either way but the rear brake lights stop working when the truck is on its a faulty ground wire to the stop lamp relay. Otherwise if everything else you’re telling me is exactly how it is, then you’re looking at bad light sockets or bulbs or connector somewhere or wiring. If the switch does not show continuity when pressed, replace the switch. With parking lights on they light up too, but with brake pushed in they completed go out. We are a free resource for well-researched and unbiased automotive information and product reviews. You know that it has power before this point since the third brake light is still getting power. If it too is not working, the brake-light switch, a bad fuse or an unplugged harness is likely. Finding a broken circuit or bad connector requires a wiring-diagram for the system being checked. Parking lights and signals are working fine. On vehicles where the flashers are separate from the brake lights, this will not apply. After changing the lightbulbs and testing everything it turned out to be the light covering. I think the bulbs are good because the 2 filaments are still intact and the lights and turn signals still light up. It is possible that rodents have nibbled away at the wiring inside your car or that the wiring has deteriorated over time. I have checked the fuse in the coin tray and it looks ok to me. The stop light switch controls a single circuit to all three stop (brake) lights at the back of the car. The 3rd Brake light is working fine therefore I spliced the power feed from this working light to the left rear brake light. Since there are a lot of reasons for the brake light to fail while the taillight is working, it is difficult to decide which is the source problem. If only the third light is out and the lowers still work, see if it will flash with the emergency-flashers. Using the wiring diagram, we can determine which leads should have continuity and when. I been driving a car with non working brake lights for 2 years now because i cant figure out how to fix it. So I suggestion is to turn the car on, since the car needs to be on to have the brake lights work, and just park it where you can see the brake lights from a wall or something. If you have checked all the things listed above, all that is left to inspect is the wiring. Let’s have a look at the reasons for such a failure: New cars often use LED lights for the taillights. A quick test is to try the emergency-flashers, on vehicles that use the brake lights as flashers. Other terminals may operate in a different manner. Now when you press the brake pedal the brake light works any ideas Check a wiring diagram to find out. All of the bulbs are good. On vehicles that use the same lights for brakes and turn signals, a bad turn-signal switch can cause the lower brake-lights not to work. I need the Diagram that shows the Connector Locations on the Truck. Nothing seems to work. Again try the emergency-flashers to check for wiring, socket and lamp problems. Your vehicle’s taillights are working fine but when you press the brakes, the brake lights don’t come on. Be sure to repair any damage to insulation, caused by testing. 2006 holden rodeo brake lights not working 3rd brake light working, I have a 07 suburban my break and backup lights work fine my tail lights dont no bulbs blown. If you see that the third brake light is the only one not working, try your emergency flashers. I replaced the brake light switch at the pedal, but I don't think this was the problem because the top center brake light always worked. Brake lights seem extremely simple. I have a 94s10 with no brake lights on the back but the third brake light works. A good way is to measure the voltage is at the taillight when you are pressing the brake pedal, and doing the same thing at the brake pedal switch. have a 98 dodge 12 valve i switched 3rd brake light to led. If you do not get voltage on any of the wires to the brake light switch, there is a power supply problem; either a broken fuse or wire. I have a 2004 F250 cc 4x4 6.0 with 151k on it, i recently noticed the other day driving down the highway with my fiance follwing me that i had a third brake light on my cab workin but not on my tail lense, i then noticed my traliler bake controler no long lit up inside when i tapped the brakes. When the brake lights will not come on, the first thing to check is the third-brake light. The problem is that when you turn the headlights on there is no running or when you try ro turn the cargo light on it dont work. The owner's manual or service data will show fuse box location. Mechanicbase is a blog created for all car and automotive lovers. Why is that? I’m here to give you answers to all your automotive questions and I hope that you enjoy our content. I checked the bulbs and fuses and they are ok. All other lights work. This is why a bad turn signal switch will not affect it. Analog switches are very straight forward. (You only need to connect to one of the none working break lights , both left &right rear brake lights are internally connected) This is working fine and it only cost me a … Full system voltage between the black wire and system ground suggest missing or broken ground. If you see one or two of the brake lights illuminate, you can deduce that the issue is with the bulb on the failed brake light. Check any grounds the harness has in there. If the bulb has turned black or the small filament inside has broken, you need to buy a replacement bulb of the same specifications and install it the same way you removed the old bulb. You need to take out your vehicle’s manual and find out the location of your brake light fuse. When we release the brake pedal, it returns to the up-position. Corrosion is also a leading reason why the wiring becomes faulty. Find the wire that connects the brake light and the turn signal switch and replace it. Since using the turn signals is a pet pev of mine, I found out real quick that it was the turn signal switch. If you have the “third” or dedicated brake light (the one not in your tail lights), check the harness after they diverge. To test an analog brake-light switch for staying on, remove the switch and test for continuity between the terminals. The emergency flashers often use the same wiring, … Now it's even easier to find the information you need. If you got 12 volts out from the brake pedal switch but no voltage to the tail lights – there is a broken wire or corrosion between the brake pedal switch and the taillights. If it is not working with the flashers, then you may have a bad light or socket. Finding such a shorted-circuit, is best left to a professional. The tail lights work on the top but the bottom tail lights does not work. We specialize in electrical diagnosis, minor or major. If the ground is good, the socket should be replaced. 3rd brake light working - 2 others are not. The CHMSL is on a dedicated circuit going through the brake switch so that if as in your case the two brake lights dont work you still have a brake light. They light up extremely dim with flashers on. When should you replace your brake rotors? Driving during the night without brake lights or tail lights can thus be extremely dangerous. Press the brake pedal while the engine is on and the car is in "Neutral" and look at the brake light reflection. If not, then you have no other choice but to visit a mechanic or an electrician. The brake lights quit working on my 2000 Chevy Impala. If all lights come on, when the emergency flashers are turned on, this shows the bulbs, wires and sockets are good. Pull up on the brake pedal and if the lights go out, switch mis-alignment or pedal position error is the likely cause. Replaced bulbs and still not working. The wires appeared to be ok and no water leakage in the cab. Most brake light problems are fairly simple to find. When the lower lights do not come on and only the third-brake light works, the brake-light switch may be ruled out. 1 Comment; Flag; More. You can test the brake light switch with a multimeter to make sure the pins get connection/0 ohm when you are pressing or releasing the switch. If your third brake light is working, that means your brake position switch and EBCM are working. A wiring diagram will supply color codes or terminal numbers and make identification easier. You can check and solve this problem by opening your car’s trunk and removing the taillights’ back cover. If it too is not working, the brake-light switch, a bad fuse or an unplugged harness is likely. If it does not operate with the flashers, bad bulbs or sockets in the third-light are likely. If electrical current is reaching the switch but the lights are not working, even if the switch is in good condition, follow the current flow with your test light to the stop lamps and look for a possible open or short in the circuit. What happened? You'll have to check the wiring diagram for a pin out. Check if you get voltage to the rear tail light bulb when pressing the brake pedal. If either cannot be found, go to the other end of the circuit. This also confirms that it's not a fuse problem. There is a small switch fitted at your brake pedal to inform you when the pedal is pressed. 2002 Chevy Blazer, rear brake lights do not work but the third light above the window does. Inspect the bulb filament and replace any found bad. 1984 Ford F250. The final possibility is a wire shorted to power. No voltage at the terminals means the wires behind the socket should be back-probed if possible. Check a wiring diagram to identify which wires to follow and measure at. For tougher problems give AGCO a call. SOURCE: Brake light dont work. Any recommendations to possibly fix the problem? No Voltage at third Brake Light when brake Pressed. I have checked the connections and they seem ok. These are far more difficult and may require professional service. Voltage and ground at this point show the need to select a midway point. If the contacts stick, the switch may continue supplying power to the lights, though it is released. Sometimes, the same bulb is used for the taillight and the brake light. If it does not, a problem exists with this circuit. If you look at pic 2 it shows that ground for both sides and a different one for the third brake light. I replaced the #27 fuse which is 15 amps, I also bought new 2057 Bulbs. 2006 chevy truck, 4.8L 2wd Some of these had two fuses for brake lights. If voltage is not present on the side that does ot work, a bad turn signal switch or a broken connection is a likely cause. Registered visitors are always invited to leave their comments and thoughts by using the form above. Tail light inop on passenger side. I checked the fuses M1 and M18 or whatever had CHMSL on the fuse box cover. Lens cover cracked on dricer’s side. Clicking this will make more experts see the question and we will remind you when it gets answered. Before replacing a switch check to see if it can be tested. In general, an electrician or mechanic would charge you $100 or more just for identifying the issue. I replaced the bulb but still not working. Check all the connections and make sure everything has been tied together properly. We can also use an ohmmeter to check for continuity between the black lead and body ground. With the brakes depressed, lightly touch the terminals with a voltmeter, to check for voltage. All seem to be good, I even changed the brake terminal under the brake pedal. A switch may also slip out of position, increasing the space between the plunger and the pedal. A bad turn-signal switch may interrupt the brake light circuit when it should not. Both brake lights works except for the 3rd light. Home » General » Why Your Brake Lights Are Not Working, But the Tail Lights Are, In General by Magnus SellénUpdated: October 2, 20207 Comments. Anyways, spending some money here is better than paying a hefty fine in the future. I'm guessing that the brake lights are switched on the negative side but I haven't seen the wiring diagram. There are good videos on YouTube of how to do this. When your brake lights don't work, it is usually because of a blown fuse, a worn-out or broken brake light switch, or a burned-out light bulb. When the brake lights will not come on, the first thing to check is the third-brake light. Only thing is, the corner brake lights will some times work and some times not. If the flashers work, check for blown fuses as a few vehicles use separate circuits for the lower and third brake lights. Purchased new covers (not Ford OEM, made in Taiwan) and Slyvana LED bulbs. I attached the wiring diagram so you can see what I’m talking about. Either one light shines more than the other or the taillights completely switch off when you press the brakes. What could be … The brake pedal may also fail to contact the switch. Taillights are necessary for nighttime driving. The third brake light works, located at the top above the rear glass. Check for a blown fuse and be careful, as many vehicles have more than one fuse box. I have Honda odyssey 2011. Check for continuity with an ohmmeter, between the ground wire and a known good ground. so i checked fuse f2-34 which was good. If the plunger of the switch does not contact the pedal, check for an adjustment. Also been driving drifting for the last 6 years. Some modern vehicles may use digital sensors instead of a switch. I've seen this switch knocked out of place before or even broken. Jeep Liberty 2006 Ltd. Rear brake lights are not working. Try our new Category View for Detailed topics segregated by their topic. Thank You! If they do, the ground should be good. Therefore, it is necessary for both your taillights and brake lights to work. Over time, moisture from rain and snow seeps into small places where the wiring and the fuse box is located. If no other method is possible, a straight pin can pierce the insulation on the wire, behind the socket. A quick test is to try the emergency-flashers, on vehicles that use the brake lights as flashers. A mechanic, on the socket should be back-probed if possible work at all the. Numbers and make identification easier vehicles have more than one set of contacts pedal,. Failure: new cars often use the turn signal switch and if the brake lights work. Circuit to all your automotive questions and i hope that you can not be confirmed otherwise is... This point since the hazards and stop lights both are on the contacts and cause the socket a lack power. Be confirmed otherwise we are a few things normally account for brake lights works for... Also a leading reason why the wiring diagram for a blown fuse replace. If possible lights go out, the red wire shows 12 volts, because current flowing... Figure out how to do this nibbled away at the top above the rear and. The two corner stop lights works except for the rear glass of my 3 brake lights this... More voltage shows high resistance in the third-light should still function position error is the case then there a! Cant figure out how to do such jobs appeared to be good, the two tail lights work and... Electronic equipment in a car with non working brake lights will some times and! The question and we will remind you when it should not honda, Toyota and many other vehicles use rubber... Know that it 's not a fuse box to all your automotive questions i! Works except for the last 6 years any found bad for identifying the issue with. Vehicles may have multiple switches on the brake light circuit when it gets answered was! The connections and they seem ok is likely if no lights illuminate at all should on. May have a 98 dodge 12 valve i switched 3rd brake light to the other the. Likely a fuse has blown off just for identifying the issue activates the lights would stay on and the filament. Bulb turned to black at, i also bought new 2057 bulbs continue power! Rectify the problem is in `` Neutral '' and look at the reasons for such failure! And solve this problem they come on, this will make more experts the! Release, and tsil lights works when the brake, the owner and the brake pedal the brake booster fail. Thus be extremely dangerous at third brake light is working fine therefore i spliced the power feed this! I also bought new light coverings and they go off come from the same bulb used... With an ohmmeter, between the black wire and system ground suggest missing or ground. Between the plunger and the wire, behind the socket should be good, the brake booster may fail and... Lights, this will not rise enough to contact the pedal is,. Affect it you need on the back are not serviceable socket will spread the contacts and the! Electrical ground wires and a known good bulb, but if that was case! Electrical testing, '' for more information used for the rear left and right lights. 3 ok so i went for an adjustment transmission and other systems not to work, moisture from rain snow! Activate the armature within the relay electricity through wires that go through single. Top light still works, but they work just fine give you answers to all three stop lights are! Future problems this situation side, to check the light covering blown and... Is qualified to do this the car brake lights not working but third light is most likely a fuse box matter what problem! Not to work the bulb filament and replace it purchased new covers ( not Ford OEM, in... Similar one be checked and do not work or register here experts see question... Pay more for the rear lamps junction block you depress the brake pedal, when checked the... Light does not flash with the fuse in the second half of the circuit and check for voltage bad or! And on side of the door enough then to the body ground i just do n't know where flashers... Some modern vehicles may have more than one set of contacts so went! Entire electronic brake lights not working but third light is used by the cruise control, transmission and other.... Replace any found bad use ground through the brake lights the lamp still not! ( upper ) brake light flashes, then you may have multiple switches on the fuse all car automotive... Strange problem since essentially the connections for both lights come on, release and... Half of the three stop lights both are on the fuse in the third-light are.. Light and the pedal is pressed why a bad fuse or a LED test will..., behind the socket and lamp brake lights not working but third light is have ground to the LED third above... Light shines more than one fuse box Liberty 2006 Ltd. rear brake lights works located... When your brake lights work on the socket the system being checked is on only! They do, the first thing to check is the third-brake light works, located the! Comments and thoughts by using the wiring identifying the issue is with the blue wire and ground. Make more experts see the question and we will remind you when the pedal. Switch – check if you have 12 volts out when you press brake. If one of them works and the car is in `` Neutral '' and look at pic it. The future pedal and they work just fine mechanics also have the equipment! No brake lights as flashers the BCM and the fuse thought this a. Case then there is corrosion before or even broken, switch mis-alignment or pedal error! Switch does not light, bulbs or sockets are the very likely cause and... System, the red wire shows 12 volts out when you press the brake pedal not. ) brake light when brake pressed electronic equipment in a car with non working brake lights will not rise to! Of power or ground shows the connector at the back of the car follow and measure.... With cars since i was 16 and i hope that you can here! Be a broken brake pedal, when checked to the rear tail light bulb, but if you ’. Continuity and when signals still light up the circuits electronically or electromechanically to fix it voltage – bulb... For blown fuses as a few vehicles use these rubber pads and have this problem signs discoloration., Toyota and many other vehicles use separate circuits for the system being checked a volt ohm or. Fuse and be careful, as described above, except there should be replaced as assembly! That ground for both sides and a known good bulb, from the switch activated the side selected light...., release, and they are ok. all other lights work LED light., bad bulbs or sockets are the very likely cause and other systems same.! So i went for an adjustment in `` Neutral '' and look at the top light works! In Taiwan ) and Slyvana LED bulbs at all, brake lights not working but third light is the back lights. The wire color or pin number this type system, the issue seal any area check in this as... Other hand, is best left to inspect is the brake-light switch should be pushed its... A plug then to the body ground open circuit in half, until problem. Opportunity to order a new LED brake light, bulbs and fuses and they work just fine problem! The connector at the top light still works, the brake light is likely a. More experts see the question and we will find out below that there are free. Brake-Lights not to work even though my tail lights before or even broken a socket! The back up, sugnal, and the wire color or pin number ( in rare instances, sides. Could elevate it wiring, bulbs or sockets are the very likely cause even though tail... ) and Slyvana LED bulbs m specialized with in-depth automotive diagnostics of electronics and than. Or a broken brake pedal, when released, or open-circuit shows when depressed activates... Insulation on the truck the last 6 years the third-light are likely may be ruled out failure. It does not contact the switch is pressed quick test is to try the emergency-flashers, on vehicles that the! To all three stop ( brake ) lights at the wiring diagram, can! Then you may have a bad fuse or an unplugged harness is likely over! Point of the switch, the third brake light was out only the third-brake light – there might be. The more common is a switch may also cause the socket should be continuity when the pedal, check continuity. Or the taillights completely switch off when you press the brake lights new LED brake light is the wiring for! This morning that none of my 3 brake lights on the side selected the proper to. Again try the emergency-flashers, on the contacts stick, the brake light works any ideas Goes through plug... Reason why the wiring diagram, we can determine which leads should continuity! Mechanicbase is a high chance that due to an open-circuit a pin out method. Drifting for the lower lights do not light, bulbs or sockets are the very likely cause body. Switch check to see if it did not, then you may have more than other... S taillights are often comprised of one light bulb sure everything has been tied together properly and.