Question about 1985 Chevrolet C1500

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Electrical Gremlin Suspect vehicle is a 1985 Chev 1/2 ton 4x4, ugly beyond description. Problem is amp draw on battery with ignition off and all switches off. Clue, or maybe red herring, is that the idjut lite for alternator is always illuminated to some degree with engine running at any rpm though charging of battery is normal. And...with the ignition off the alt light will illuminate brightly if the heat control is moved from the off position. Fan operates normally. Disconnecting fan puts out the alt light but draw is still present. Been at this 30 years but stumped on this one. Either I am missing the obvious or too old to reach simple conclusions anymore.

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How about if you disconnect the battery negative, disconnect the main power lead from the alternator, insulate it and tuck it safely away, and then reconnect the battery negative. Is the draw still there? If not then I would say the diodes in the alternator are at fault.

Very best regards


Posted on Jun 09, 2008

  • Steven Adams
    Steven Adams Jun 24, 2008

    Thankyou for the rating, and I'm glad I could help. Any more problems then just click the ASK ME button under my round white faced strange looking picture.





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