My tail lights went out. I have changed the fuse and also the brake relay fuse. They both quit working at the same time. What else could it be??


Asked by Jul 14, 2007 at 06:46 PM about the 1997 Chevrolet C/K 1500

Question type: Maintenance & Repair

I have also checked the bulbs and they are all fine.  Couldnt find any damaged wiring as well.

32 Answers


Did you replace the fuse with one of the same amperage as original? A higher or lower amperage fuse will cause the lights to not operate. Also remove the rear taillight assemblies and the covers over the "computer" assembly, basically a small circuit board behind each taillight, and check for shorts, breaks, or loose wires. These circuit boards are known to go bad.

13 of 13 people found this helpful.

Yes we used the amp and we have looked at the ciruit boards and they look fine but we are going to take it to a professional. thanks for your suggestions.

4 of 4 people found this helpful.

not sure if it helps but my 89 C1500 had the same problem turns out it was something to sdo with the turnsignal switch and the relay and sensors. in the steering colum

11 of 11 people found this helpful.

the wiring harness did it to me try that

5 of 5 people found this helpful.

check the wiring on the back right where it goes from the frame to the box it might have corroded wires this is very common on these trucks

9 of 9 people found this helpful.

have you checked to see if you have a good ground, sometimes if you just reconnect the ground wire somewhere else that can help

2 of 2 people found this helpful.

sounds like your break light switch has gone bad is located on bottom of stering collum,right behind the break peddle.

4 of 4 people found this helpful.

Run a wire from the negative post on your battery to your frame and then run another wire from your frame to your bed and that might fix it. That's what happened to mine

5 of 5 people found this helpful.


3 of 3 people found this helpful.

i have a 93 and i have done changed all that in my case it was the turn signal switch but you best bet is to take it to a shop so they can trace down all the wiring and check it then go from there.

1 of 1 people found this helpful.

There's a switch under the brake pedal also. Try that. It went bad on my Dad's '94 a couple times.

1 of 1 people found this helpful.

I have the same truck, and had the same problem in a two week span. Chevy is great, but they have problems with the contact plates. That fixed my problem, try changing those...

9 of 9 people found this helpful.

connector plates... sorry.

1 of 1 people found this helpful.

do you have a third brake light if so does it light up if so its your turn signal switch

11 of 11 people found this helpful.

my 89 one ton has problems with the brake lights sticking on. even when every single fuse is out.all of them. have to disconnect the battery to avoid killing it.last time this happened I didn't notice until battery was dead and taillight assembly had partially melted.nice,huh.replaced light switch,brake pedal switch,all new fuses of proper amperage,and still nothing.hooked up to trailer and trailer lights all work properly. replaced taillight assemblies and worked fine for a year and a half. been another year and a half,time to replace again. stock up!

1 of 1 people found this helpful.

At the connector (wires plug into tail light housing) the plug sits down onto pins attached to the "circuit board". If one of those pins are bad or have gotten sloppy in their seat, the connection to the board can/will be compromised. My 98 started losing turn signals if the lights were on

10 of 10 people found this helpful.

but had them wen lights were off. Spliced new wires and plugs, bought new bulbs, lifted tabs under board and flattened out the board strips, and throughout all that they would work sometimes and then they would quit for a while, I'd try the next thing and they would work for a while again . They eventually quit all together and I discovered that particular pin was bad. I pulled pin with needlenose and the one for the backup lights. I put the b/u pin into the t/s pins hole. I don't have b/u lights but have NOT had any probs out of t/s in the 7months since

3 of 3 people found this helpful.

my wire harness to the back lights at the end they all test possitive, what is the problem

14 of 14 people found this helpful.

my 1997 chev c1500 350 vortec 2 wd. All my rear lights went out. Had shop fix it 2 times for same problem. So I installed a new brake light system, using no truck part, now all lights work great, no problem with lights at all. Truck brake lights do not work but my new brake light system does work. Flashers and turn signals work too. --- New problem, if cruise control is on and turn lights on, cruise control turns off. Have been told maybe light switch is bad so will be putting in light switch if I can get dash off.

1 of 1 people found this helpful.

Had same problem. Circuit board WITHIN taillights. $30 at O'Reilly. This was AFTEr spending hours chasing wires, cleaning up trailer hitch wiring, bulbs, downloading schematic, etc.

7 of 7 people found this helpful.

I have a 95 z71 I have no break light or rear turn sig the running lights wrk all fuse are are good do I need to get the brake an turn sig relay or chase down the wireing??????

9 of 9 people found this helpful.

I have new circuit boards fuses

1 of 1 people found this helpful.

77 Chevy Blazer that I replaced the column plate for the turn signal/emgcy flasher, and since then I installed higher amp fuses which made things smoke under the dash, so I changed back to the suggested fuse/s and the brake lights fuse keeps blowing, and running lights don't work at all. Is this the relay, and if so where is that located?

2 of 2 people found this helpful.

I have a 1989 gmc sierra my trail lights won't come on at all. ..I replaced the on of switch and dimmer switch...still nothing , anyone. .

6 of 6 people found this helpful.

My passenger break and turn signal are out changed fuse and bulbs still nothing help :(

3 of 3 people found this helpful.

I guess I'm wondering where should I start

1 of 1 people found this helpful.

I have a 2000 k2500, brake lights would not work. Stupid as it is, replace the burnt out bulb in the 3rd brake light, as in , on the back of the cab , and presto, problem fixed! Leave it to GM. I guess it's better to have no brake lights than no 3rd brake light.


Ya it ended up being the Tail Light Circuit Board cheap and easy fix :)


It was my granddaddy truck. The manuel is missing and the fuse door is missing so I cant read the fuses to see what is not working. Chevy Z71 Model #C1500. I am trying to found the fuse number that goes to the tail lights on the truck

1 of 1 people found this helpful.

it should a 20 amp fuse

I have the same problem going on. Driver side running lights and reverse light don't work. Break and turn lights do. I replaced bulbs, circuit board thing, fuses. Nothing seems to work.


its the 7866 relay in the lower right corner of the stupid fuse box- go figure, what a waste of my time - relay all the time.

1 of 1 people found this helpful.

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