Question about 1994 Chevrolet C1500

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Brake light problem

Did you fix your problem? i am having the same exact problem. i replaced the brake pedal switch, all the bulbs, fuses ok, even changed the taillight assemblies.
was wondering if you had any luck with the relays, as the person suggested? you can answer me here or
thanks in advance!

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  • topdown63 Dec 16, 2008

    I'm still working on this problem.

    The turn signals do work.

    Running lights work.

    Reverse Lights work.

    License plate lights work.

    This all started with my license plate lights going out. Then my brake lights went out. Then my headlights went out.

    Just replaced the License plate lights. I had replaced the Brake light bulbs, even the Brake light assembly. I replaced the Headlight switch, now the headlights work again. Just installed a new battery too.

    My center high mount stop light (top of cab), had all the bulbs burnt out. I bought all new bulbs, installed but still no brake lights. Even the cargo lights on the same assembly don't work.

    There IS power going to the plug there, but nothing from the brake switch.

    I now have a schematic that shows there is a Relay that powers the High Mount Brake Light. I've seen on another forum that this Relay is either located in the Engine Compartment on the firewall, or in the glovebox. I only have a Fuel Pump Relay in the Engine Compartment, so I took apart the glovebox and there were 4 Relays there. As I jumped from 30 to 87 on each Relay, it turned on the Load Component. All 4 were for the AC system. No other Relays in that area.

    Someone stated the Relay could be located on the left side of steering wheel on the side of the dash but no such luck.

    Below the fuse panel I found the Horn Relay and the Starter Relay.

    I read on another forum the problem was the ground for the High Mount Stop light Relay. It also said that the ground comes from the block and I checked the ground, on the back of the engine block and it's good.

    Any suggestions would be greatly appreciated!

  • topdown63 Dec 26, 2008

    Thank you for your reply.
    I have since fixed the problem.
    I took the dash apart and took the Headlight switch out. It was partially melted. I replaced it.
    That WAS the problem, only thing is that one of the first things I replaced was the brake switch. The NEW brake switch came broken, so switching the Headlight switch did not resolve my problem right away. I decided to test the power coming out of the brake switch and found it wasn't sending power when the pedal was pressed.
    Luckily I kept my old switch in the truck, and just swapped it out. Problem fixed.

    This problem was almost a year long in length to fix! I hope this information helps the next person who may encounter this problem!

  • jr0353 May 11, 2010

    does your turn signals work? could be your turn signal switch



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SOURCE: Have you fixed this problem?? Brake lights....

that is your problem gm had a big problem w/headlight switches mealting hopefully the connector is alright. if not dealer should have a conn. kit

Posted on Dec 03, 2008


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(American Car) All Brake Lights Not Working
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