88 c10 no brake lights or turn signals?

Discussion in 'Chevy Truck Forum' started by ludude1975, Sep 2, 2009.

  1. ludude1975

    ludude1975 New Member

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    Helping a friend troubleshoot his 88 chevy c10 pickup truck.

    1st off the headlights and parking lights work which includes the tail light parking lights. The Brake lights don't work at all and have no affect with driving lights on or off. Same goes with the turn signals & hazzard lights. Flick the switch nothing happens not even the solid dash turn light.

    Both were working fine and suddenly quit. Fuses & bulbs have been checked. I checked both switches on brake petal and both check fine. Checked for pinches etc in wiring all seems ok from back clear up to firewall behind fuse block. Only thing I couldn't check is some kind of black box with a circuit board in it up under the dash behind the radio. took it out nothing looks burnt? What is this box? It looks as the brake switch & possibly rear lights may connect to it.

    Anyone have any idea what to look for? I think he would greatly appreciate it.

    Chad
     
  2. silverhairdeere

    silverhairdeere Senior Member

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    try adjusting your brake pedal switch .

    shd
     
  3. crabtruck

    crabtruck Senior Member

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    Welcome to the forum Chad.

    Don't know how you determined the fuses were good,
    but I think you need to check the fuse again.
    It is the "common to both" point. Think the fuse
    is the one 3 up from flasher unit in fuse block, not sure.

    Test with voltmeter or testlite at fuse, and if ok,
    pull flasher for haz (not turn) and check for hot at socket there.

    Be sure to post back what you find.
     
  4. ludude1975

    ludude1975 New Member

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    Of all things the turn signal switch was bad. He changed it all is working fine again.
     
  5. crabtruck

    crabtruck Senior Member

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    Glad to hear it. Thanks for posting that back.
     
  6. Crmzendrgone

    Crmzendrgone Senior Member

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    Dang read it to late I was going to suggest the turn signal switch. Sucks being a slow reader.
     
  7. autoshopazn

    autoshopazn Senior Member

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    im with him on that. Fuses are cheap and it wouldnt hurt to change them since you are in a older truck. I know that on my truck there are separate circuit boards on the tail lights but i don't see how it would affect the whole system. check the fuses
     

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