If you are unsure of the wire color associated with brake light function, you can access wiring diagrams online, but be warned, chev/gm have been known to change color codes from time to time. Our "Jimmy" has developed a brake light issue in the last few days. i had to replace my brake light switch cause when i stepped on the brakes the they would work till i put more pressure on the peddle then they would go out.now i have no brake lites.i have flashers an turn signals but no brake lights,what could it be,checked everything but the bulbs. Why are my Volvo brake lights not working? E85 vs. Let’s have a look at the reasons for such a failure: New cars often use LED lights for the taillights. Remove the tail light connectors and look for any signs of rust or corrosion. Check this for corrosion and clean it with electronic spray. If the bulb used in the brake light has gone faulty, it will not work when you depress the brakes. Timothy Phillips. My break light on my cab works all my lights work i checked the main wire to break lights at the conecter no power to break lights i pulled the relay replaced it with a known good one nothing figured eather switch or short storming here so cant mess with now, 11/30/2018 by sure enough, the ECM was seeing the park brake as “not set” which is a requirement to initiate a parked regen. 08/06/2015 by Location of the relay depends on the year of the truck but mine was in the engine compartment on firewall by the master cylinder. The “STOP” fuse was blowing - sometimes after the brake was activated, and sometimes as soon as plugging in a new fuse. cool_uncle_jesse1. I've switched out the left bulb holder to the right side and it works on right side. john willams, I changed my brake light switch and my brake lights don't work i can activate the brake light switch by pressing the little tab but its all together it dont work all my other lights work its a 1997 chevy suburban, I'm not quite done yet I didn't have any lights no I just got brake lights to fix yet. just need to remove a clip and lift up on the plastic piece to remove it from the brake cable, then disconnect the wiring harness and pop in the new one, atacth the clip and you are good to go. Formally called the Chevrolet C/K, C/K is a series of trucks manufactured by General Motors and marketed under the Chevrolet and GMC brands. 10/17/2015 by Two years ago we had a huge problem with the wiring harness, it would loosen it's connection from our dirt road and the truck would just shut off. At the taillights how many wires are on plug that goes into taillights? Troubleshooting Brake Lights Not Working on a 2013 Volvo XC90 after Shorting Power Wire of # 118411; Installing an Aftermarket Brake Controller on a 2011 Volvo XC90 with Factory Brake Controller; Running Light Pin has Power All the Time on Trailer Wiring Harness for a 2008 Volvo XC90 There is a high chance that due to an electrical surge, the brake light fuse has blown off. 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. Greg Steele Jr, Katelyn The end yellow lead was melted in the connector and the female plug for this wire was black. and got to good clean un-rotten wire -- took a FILE to the frame rail rust 'till I found bare metal re-attached the ground VERY WELL ------------no more taillight problems. So if things get just too wierd - ck your grounds! Jim, I believe that when your truck is "on" your running lights are on. 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. When the key is on they stop working. If the car is equipped with push-button start, hold the start button until the instrument cluster lights come on but do not press any pedals. I have Honda odyssey 2011. Brake lights were working intermittently. Other things use that ground when the key is on so its not strong enough then to activate the armature within the relay. A blue wire connects the brake lights switch to the rear lamps junction block. Replacing light bulbs is often very straightforward, and they are very cheap to replace. On my 01gm3500,bulbs are good, fuse js good. But the passenger side brake light still doesn't work. but now not working. it worked for me on a 1997 k2500. The driver side tail & brake light.. also the third light is not working. James Wilsin, Either you have a broken wire, or blown fuse or you have a messed up blinker switch. Last year I experienced intermittent failures of the brake lights, and it led my mechanic to exchange the break pedal switch. expert reply by: Michael H. 0. Was just helping my Father-in-law work on his ‘92 C1500. Chopperhaulers. So don't just check the brake light. Also, in the left side of the trunk there is a little blue box that I do not know what it is for. There is a small switch installed at your brake pedal to inform the control unit when the pedal is pressed, sending power to the brake lights. Thank You! I put in new brake light switch and still no brake lights. deconstructer, I have a 95 Chevy 1500 ext cab 4x4 my brake lights and hazzards don't work I've replaced the brake switch, turn signal switch, ran a new ground from the battery, and got new tail light circuit boards what is the problem, 04/28/2016 by Test wires at tail see if your getting power to taillights. Let me know how the u do w/ brake light switch, and if u have issue w/ tail lights? I pushed the brake … Turn signal and runninglights and emergency flashers all work. All other lights work. The parking brake module (PBM) service mode is malfunctioning. Ledfoot1965. To figure it out get a test light clean a piece of metal connect teat light ground, then unplug taillight and stick trat light probe into 1 slot at a time see what works and what doesnt and write it down. Any recommendations to possibly fix the problem? Are alll the lihhts on? Sometimes it's stupid simple things you wouldn't normally think of, I have a 1993 Chevy k1500 I have no running lights in the rear the brake light works and the turn signal works to but no running light what could be the problem, this is not an answer it is another question, 12/17/2019 by Did you figure out the problem? Awesome!!!! Nothing made sense. However, If we turn off the lights the rear brake lamps won't light up when brake pedal is applied. Then the problem came back again. Why are my Rear Brake lights not working We checked the fuses and they seem fine. I have an 07 Jeep patriot doing the same thing. The most common reason rear lights of any kind will fail is rotted wires. it will most likely be beside your brake fluid assembly, in a cluster, entering the firewall. I think on most C/K 1500/2500 it is on the brake pedal arm or the arm hits it. Unscrew, the lens un-hooks on the other side. I changed the relay, I changed the wire harness from the ignition . step number one; hook up the computer and check to see what condition the ECM is reading, this rules out a burnt out dash bulb. How can I fix not working brake lights? I had this same problem. One of the wires broken during the incident three years ago was a yellow wire that supplies power to the upper third brake light. So if you see a fresh butt splice or recent wire remember "human error" can cause some crazy wiring issues, 12/11/2015 by If the rear light lights up correctly but does not become bright when the brake is applied then the switch of the brake is faulty. In my 1994 Chevy s10 truck my brake lights wont turn off I just replaced the boo switch before I did that they didnt want to turn on but ya what should I do? Took it loose - did a fair job cleaning the frame surface rust and reconnected it. ... Yeah I've been driving for a long time and I've never seen a vehicle that illuminates the brake lights … I have a 94s10 with no brake lights on the back but the third brake light works. Fixed it it was the wires under the sterring wheel, I turn on the light and the brake is not on and I turn off the light off and the brake is on .I can not find out why, 01/12/2017 by What wires did you find under your dash? James Dean Went back to that ground again -- took it loose -- stripped the wire casing back a couple inches and BINGO!!!!!!!! IIRC bottom is backup and the top one is brake. Tail light inop on passenger side. 5 Reasons Why Your Radiator Fan Is Not Coming On, 10 Reasons Why Your Car Jerks When Accelerating, Oil Smells Like Gas - 6 Reasons Why Gas is getting…, Why You Should Replace Your Cabin Air Filter In Time. Cables were pulled too tight. Are the bulbs good or blown. Fuses usually blow for a reason. There's a fuse. Do the lights dim sleightly when you press the brakes? It could also be a relay, the box is located in the engine bay and the relay will be marked, but its unlikely to be the problem. Jessica It was white wire was disconnected and the brake switch was not adjusted right, I have brake lights and turn signals when I pulled my "tail light/ courtesy marker light" fuse. r2'd the harness and now I have brake lights!!! I never knew the light to not be working, but it is absolutely possible that is hasn't worked the past three years. 04/28/2015 by You should also check if there is any connector plug in the car between the brake light switch and the tail light. If they are drawing too much power then switching to LED lights will solve that problem because they draw a fraction of the power compared to incandescent lights. I replaced the bulb but still not working. So the way the brake lights work they go through a relay and through blinker switch. Exchange relays to see if the relay is faulty and replace it if it is. before my patch this lights working when i press SPACE my truck lights shows other cars - stopped. Open tailgate, there's two (rusted) Phillips screws into the taillight lens. Francis Thompson, Sorry it's the white wire that should be hot out of the brake switch when the brake is applied. If your familiar with how the switch works you'll know the pedal pushes the button before it starts pushing the rod to the booster. Wish me luck. This circuit is connected with the brake pedal – if the switch is out of place or connected incorrectly then the pedal may not be able to complete the circuit correctly. I've changed the bulbs, brake switch & relay..also checked the fuses..Passenger side started working but not Driver side....Help. But sometimes there are occasions where one of them works and the other doesn’t. If the fuse is blown, you should make sure that there is no circuit short on the wirings or in the connector to the brake light. Had no brake lights and hazards were not working. Hello, I’m Magnus, the owner and the writer of this website. Somehow there isnt enough slack between the pedal and the booster rod. I did notice when my blinker is on (headlights turned off)when I hit my break my dash lights for my "heat and cool" flash with my blinker. Its the taillight circuit board or a broken wire. Try replacing those, and if that doesnt work look for broken wires under dash, and check all the fuses, replace blinker switch, and hazard switch. 02/02/2016 by In my case, the brake lights didn't work but the turn signals did, so that told me the wiring to the bulbs was OK and the wiring running in the frame was OK and the bulb contacts were OK. Also check the turn signals. My turn signals in the front would dim when I turned them on and the ones in the rear would turn onand not flash. 1984 Ford F250. I had the same break light problem. Earlier in the thread someone mentioned this problem an there solution was to drill the hole on the push rod larger to achieve the (slop) needed to activate the switch. If the trailer has a lot of lights the power draw could be too much for the wiring harness to handle but usually when that happens the converter box or fuse will blow. It's like if I had a spring behind the switch on the pushrod it would work fine. 1994 Chevy C1500, 03/26/2017 by Mechanicbase is a blog created for all car and automotive lovers. brianbonner90. Yes, you could brush it and clean it to be reused, but do you really want to do that at the risk of your brake lights not working (which BTW is illegal to drive with in North America). Any help at all with this brake light issue would be greatly appreciated. Your vehicle’s taillights are working fine, but the brake lights don’t come on when you press the brakes. There could also be a circuit short somewhere that blew all the lights if the wrong fuse is installed. Checked later in the day and were not working. There could be a fault in the brake light relay. Is there a separate brake light switch for the trailer? when my lights are on the brake lights do not work, they work when the lights are off - Volvo 2000 S40 question Obviously we checked all the involved fuses and the issue is not … I've moved the ground around, replaced break switch, headlight switch, tail light circuit boards no luck. In rare cases, there might also be a broken wire somewhere. mike palazza The rest of the brake lights all work properly. Do the brake lights light up dimly? Any solutions? - None of the 3 major brake lights work. It is probably your fuse relay swithch underneath the hood toward the driver side. Only left turn worked -- No brake lights -- no running rear lights -- no flashers -- no backup lights. I do not see how the Brake Control Module would effect your brake lights since the lights are tied into the Rear Electronic Module. Got to the point that I was on the brake switch an determining its functionality. James Bisidas. All the lights are good. There could also be corrosion in the pins in the connectors of the taillights. So the frame was working as a power source....but only when the headlight/ running light circuit was on. We took the flasher out and the brake lights work great. I bought new light coverings and they work just fine. Turn your flashers on to check the bulbs .Checks good go to your brake light switch mounted on upper part of the brake pedal with a simple test light you should have hot (test light on) when the brake pedal is depressed if not and the ong wire is hot (15 amp fuse in the fuse panel under dash) says STOP by it you need to replace the brake light switch. Chased no break lights but high mount was working along with all other lights worked fine turned out to be bad conection on combination switch plug, Im ashamed to say it took 5 hrs and im not a rookie i did unplugged and check previously but it was the conector retainer wasnt alowing enough hold for proper connection, (Really i think its time to take her to a gambler500, But shes never left me stranded other than #10boltssuck), Step on my brakes and my radio comes on but brake light do not come on, 09/11/2020 by Replaced the pig tail from The tractor and seemed to work. I couldnt figure out why my light didn't work. Plain Jane accept for High Output Heater, Limited Slip Diff and Engine Block Heater. I guess I'm luckier than most…got more than one Chevy…..I have a c3500 with brake light issues…I tried the lights on another vehicle and they are fine…new brake switch…fuses are fine….gotta be a ground wire…changing the brake switch is a pain when I had to drop the steering wheel…figure I might as well change the lights on the cab…was shocked when I found no bulbs in it to start. 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 found the white wire coming from the turn signal harness broke down at the flat connector at the bottom of the steering column. 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