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CUMMINGS 370 PRE HEAT-gctid823826

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    CUMMINGS 370 PRE HEAT-gctid823826

    I replaced a dead alternator and the preheat light will not shut off and the preheat itself appears to not be working at all. Any suggestions?

    #2
    The preheat circuits and the alternator circuits are separate. check the plug in on top of the Alternator if it is a Delco.

    check the 2 contactors on the preheat system as they are prone to failure and check that there is power to the preheat ECM.

    https://www.sbmar.com/wp-content/upl...-C-wiring1.pdf

    Note the several alternator wiring options by brand.

    Here is the Air Heater diagram

    https://www.sbmar.com/wp-content/upl...B-C-wiring.pdf
    "Adios Dinero"
    1997 3988 with new 330 Cummins
    Photo Credit: Whiskywizard

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