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Thread: Charging troubles

  1. #1
    Registered Member
    Join Date
    Jul 2020

    Member #:4460
    Posts
    231

    Charging troubles

    I have lc9 engine from 09 truck with 5.3ls. It has 4 wire pigtail but only two wires go there,Grey and Brown. How does it has to be wired to get it chargin? I know the ecu controls the charge i think but mine does not charge at all. I also connected my fan positive wires straight to the alternator, is that bad or ok?

  2. #2
    Registered Member
    Join Date
    Jul 2020

    Member #:4460
    Posts
    231
    Alternator was bad even it was new. I bought new one and wired it thru ignition switch yo alt light and then to L port in alternator and it started charging..this is a new 105A truck alternator

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