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Headlight trouble

Discussion in 'Chevy Trucks' started by bajaman, Feb 23, 2005.

  1. bajaman

    bajaman Junior Member
    Messages: 3

    I have a 1990 ext cab Z71. While driving home I hit the high beam switch and all of the running lights, courtesy lights and the radio went out. I took it to a local garage and they were unable to find the problem but they did run power from the junction box to the headlight switch and every thing works. But when driving with the headlights on the voltmeter slowly drops and after about 10-15 minutes the engine starts surging. Any suggestions?
  2. repo_man62

    repo_man62 Senior Member
    Messages: 502

    Check the dimmer switch...if it's on the turn signal switch...I would almost bet you need to replace it. Check your grounds too!
    Last edited: Feb 23, 2005
  3. bajaman

    bajaman Junior Member
    Messages: 3

    I Removed the dimmer switch and rang it out, it worked fine. I suspected bad grounds though I check and get back. Thanks
  4. NJBuickRacer

    NJBuickRacer Member
    Messages: 59

    I agree...check the grounds. If the small wire from the terminal to the fender has a bad connection or a break it can cause the symptoms you describe. If it's melted, then the connection at the block is weak and your whole truck is trying to ground through the one little wire. I usually add a ground strap from the frame to the engine just for a little more peace of mind.
  5. TLS

    TLS PlowSite.com Addict
    Messages: 1,425

    You should go out and buy a new headlight switch from GM.

    Most of the C/K models (yours definately) used the switch to actually start/stop current to your headlights. Later models used relays and the switch simply activates the relay.

    Anyway, since all this load is on this little switch, they get worn out quickly.

    Replace that, and see if it helps. If it doesn't, you haven't wasted any money, as it would have shortly failed anyway!
  6. bajaman

    bajaman Junior Member
    Messages: 3

    Bad grounds it was!!!! I cleaned all I could find and added one from the engine to the frame, it did the trick!!! Thanks for the advise. :drinkup: