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1988 Peterbilt 377 Wiring Schematics

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Wrecker1, Jul 22, 2022.

  1. Jul 22, 2022 #1
    Wrecker1

    Wrecker1 Bobtail Member

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    Oct 13, 2021
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    Looking for alarm circuit schematics for low oil pressure, low air pressure, engine shutdown, etc. Have absolutely no troubleshooting documentation, and really killing myself to determine why this alarm won't quit. Thank you for any help you can give.
     
    Wrecker1, Jul 22, 2022
    Wrecker1, Jul 22, 2022
    #1
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  3. Jul 23, 2022 #2
    kranky1

    kranky1 Road Train Member

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    Sep 16, 2015
    Ontario, Canada
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    First place I’d look would be the low water level sensor. Look and see if the jumper that’s probably there fell out or rotted off. That would be the most obvious. From there run it and jump all the sensor wires one at a time. When you jump one and the alarm stops you found it, if not you need to check continuity in the wiring. You may be hunting a broken wire.
     
    kranky1, Jul 23, 2022
    kranky1, Jul 23, 2022
    #2
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