77 ChevPU 350ci Electrical system shutdown.,

Discussion in 'Trucks and Trailers' started by ray1941, Aug 13, 2000.

  1. ray1941

    ray1941 LawnSite Member
    Messages: 8

    1977 Chev PU 350CI. I have experienced complete electrical shutdown. Truck was running great 3 days ago. Applied booster battery.Battery in truck checks good. Not even a peep or groan was heard. None of the insruments are working. Checked all accessible wire connections.Please advise where I should start to look. Thanks to all that reply. Much appreciated.
  2. plowking35

    plowking35 LawnSite Bronze Member
    from S.E. CT
    Messages: 1,687

    Up under dash behind steering colum look for a large ground buss. If that isnt it look for the large electrical connection on the firewall. My bet is a ground somewhere.
  3. Chuck Smith

    Chuck Smith LawnSite Senior Member
    Messages: 849

    There is a fuseable link inline in the power supply wire. It sounds like it fried. This can happen easily if jumper cables are hooked up wrong, even for only a second. That's why the fusable link is there, to protect the other wiring. They also just can go bad for no apparent reason, though it's rare.

    The fusable link is usually located under the hood, on the firewall, just above the distributor. It's inside a small piece of braided nylon covering.

    Also, use a test light, and see just how good the ground point is on the alternator bracket where the ground wire from the batery attaches.

    As Dino mentioned, grounds are very important, and are responsible for about 80% of all electrical troubles.

  4. ray1941

    ray1941 LawnSite Member
    Messages: 8

    Thanks Chuck
    Your suggestion to check the fusible link was right on. I by passed the link with a jumper. The truck sprang back to life. Will replace the link.

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