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.

24 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.

12 out of 12 people think this is 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.

3 out of 3 people think this is 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

8 out of 8 people think this is helpful.

the wiring harness did it to me try that

5 out of 5 people think this is 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

7 out of 7 people think this is 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 out of 2 people think this is helpful.

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

4 out of 4 people think this is 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

3 out of 3 people think this is helpful.


3 out of 3 people think this is 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 out of 1 people think this is helpful.

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


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...

8 out of 8 people think this is helpful.

connector plates... sorry.

1 out of 1 people think this is helpful.

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

10 out of 10 people think this is 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 out of 1 people think this is 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

7 out of 7 people think this is 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

2 out of 2 people think this is helpful.

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

13 out of 13 people think this is 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 out of 1 people think this is 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.

5 out of 5 people think this is 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??????

6 out of 6 people think this is helpful.

I have new circuit boards fuses


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?

1 out of 1 people think this is 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. .

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