Question about 1978 Chevrolet C1500

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I have a missing wire from my altetnator and would like to know if thats why its not holdind a charge . and does the missing wire go to the ground on the battery .

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  • Richard Scordino May 11, 2010

    That depends on what wire is missing. don't connect to ground. likely that is the last place it should go.


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More than likely the wire that excites the regulator on top

Posted on Sep 13, 2009

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Not having a wiring diagram, I can say this sounds very much like a grounding problem to me. Try running ground wires to the headlight buckets,bulbs an Ignition module.

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A good multi meter would do you some justice it sounds like , from new components and statement sounds like a missing ground , if the motor has been swapped out check all the fram to ground connections as well as any moter mount ground bridges , a charging system is rather simple (make a complete circuit) , wire harnesses make this a chore to trace down but provides a factory working condition ,. To just trouble shoot charging is done with the field wire to batt pos , and earth (ground) to alternator case . good luck!

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  1. Check the wiring of the new radio installed as follows..
  2. Disconnect battery ground
  3. verify radio ground wire is grounded to metal
  4. verify radio hot wire (normally red and thick) is connected to a power source that is off when the ignition key is in the "off" position.
  5. verify that the always hot wire is connect to a constant 12v power supply even with the ignition off.
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  10. If it continues running problem solved..

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