1998 Peterbilt engine fan headlight issue

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by The distracted driver, Feb 12, 2019.

  1. Feb 12, 2019 #1
    The distracted driver

    The distracted driver Bobtail Member

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    Feb 12, 2019
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    need help with mine when I cut my headlights on the engine fan cuts on when i cut my engine fanon my headlights cut on I'm dumbfounded
     
    The distracted driver, Feb 12, 2019
    The distracted driver, Feb 12, 2019
    #1
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  3. Feb 12, 2019 #2
    RocketScott

    RocketScott Medium Load Member

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    Apr 10, 2013
    Kentucky
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    Sounds like you're getting some volts leaking back and forth

    Could be worn insulation on the wires or possibly some gunk that's conducting between the terminals at the connector

    Check at the firewall pass through connector. I believe the fan and headlights are on the same plug (hood). Might just need to spray it out with contact cleaner

    If it's not down there it's probably behind the dash
     
    RocketScott, Feb 12, 2019
    RocketScott, Feb 12, 2019
    #2
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