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Thread: Brake Lights

  1. #1

    Default Brake Lights

    On my 1978 c-20 the brake lights wont work. Ive checked and double checked the fuses. Strange is that the tail lights will work but when you press the brakes the brake lights wont come on. Im not sure if its maybe the wire that runs back or maybe its a problem with the taillights?
    1978 Chevy C-20 3/4 ton
    Still a work in progress

    !986 Pontiac Firebird
    350 with glasspacks
    Disturbing the peace

  2. #2
    Jr. Apprentice
    Join Date
    Sep 2009
    Moses Lake, Wa


    Have you tried a brake lamp switch?
    BowTies are back baby!!!

  3. #3


    also the brake lights run through the turn signal switch. Power comes from the fuse to the brakelight switch on the brake pedal(believe orange wire) then out of the brakelight switch to the turn signal switch plug(should be white wire) and it gets split up inside the switch. you could test to make sure you have power going into the turn signal switch at the white wire whe the brake pedal is depressed, if you do, and the turn signals work in the rear then it has to be in the turn signal switch. If the turn signals dont work at the rear it still could be the switch or wiring but if they work out back its not wiring since the turn signals and brakelights are on same wire. Also if no power going from brakelight switch to turn signal switch, check power going into the brakelight switch, if you have power going in but not out its the brakelight switch. the brakelight switch will be an easy part to replace, and the turn signal switch will be a littke work( removing steering wheel, lock plate, and the colum support) but its not impossible. The parts are readily available at most parts stores and are relatively cheap. Also if the turn signal switch is the problem, some parts stores also loan out the steering wheel remover and lock plate tool for a deposit.
    77 GMC Crew Cab long bed, converted to lowered 1/2ton, soon to have a 5.3L/4L60E and 2000 silverado interior "project identity crisis"
    89 Chevy short bed 1/2t lowered 350 5spd

    49 studebaker rat rod truck, chopped 4", S10 frame, Caddy 425 powered

    81 Camaro Phantom Z

    91 miata "street legal gokart"

    07 YFZ450

  4. #4


    Turns out to be two things. It WAS the brakelight switch AND the fuses. The original fuses i bought must have been dropped or for whatever reason were defective. So i ended up replacing the brakelight switch but still no brake lights, after a day of cursing i decided to retry a new set of fuses and they worked. Out of curiosity i decided to reinstall the old brakelight switch and they didnt work so it was both the switch and fuses. Thank you for the help.

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