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Arc when connecting alternator. Anyone can help me with this?

Discussion in 'Medium-duty Truck Forum' started by Alan Brady, Jun 18, 2013.

  1. Alan Brady

    Alan Brady New Member

    I have recently purchased a 1995 Chevrolet Kodiak with the CAT Powered Diesel, this truck had alot of relays missing and wiring headaches, i fixed 95% of the wiring and now have to work on the instrument panel and the alternator. Everytime I connect the positive to the alternator it arcs really bad so I'm suspecting a short in the positive cable or a faulty alternator.
  2. ChevyFan

    ChevyFan November Beard Grower - Cancer Fighter Staff Member 5+ Years 5000 Posts

    You're shorting out somewhere. What's the history of the truck. Have you recently started to repair this and you started with the wiring?
  3. RayVoy

    RayVoy Well-Known Member 2 Years 1000 Posts

    In a car, or smaller truck, that would indicate a blown diode in the alternator. The larger trucks probably use a similar alternator.

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