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2001 Peterbilt 379 ac help please

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Trevor19, Jun 16, 2025 at 6:23 PM.

Page 4 of 4
  1. Jun 20, 2025 at 12:42 PM #31
    Trevor19

    Trevor19 Bobtail Member

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    I don’t hear any sounds when jumping those pins
     
    Trevor19, Jun 20, 2025 at 12:42 PM
    Trevor19, Jun 20, 2025 at 12:42 PM
    #31
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  3. Jun 20, 2025 at 12:44 PM #32
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    If that works, see if any of those pins are grounded. @Star Rider mentioned petes working on a ground. They did on the earlier trucks.

    Key on, A/C switch on, you should a ground. A/C switch off, yoy should lose that ground
     
    Big Road Skateboard, Jun 20, 2025 at 12:44 PM
    Big Road Skateboard, Jun 20, 2025 at 12:44 PM
    #32
    bjytech Thanks this.
  4. Jun 20, 2025 at 12:48 PM #33
    bjytech

    bjytech Light Load Member

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    Yes petes work on a grounding system.

    Pin 30 on the relay goes straight to the clutch so jump your power on 87 to 30 and it should kick it in.
     
    bjytech, Jun 20, 2025 at 12:48 PM
    bjytech, Jun 20, 2025 at 12:48 PM
    #33
    Big Road Skateboard Thanks this.
  5. Jun 20, 2025 at 12:51 PM #34
    Trevor19

    Trevor19 Bobtail Member

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    No sound from compressor when jumping those two
     
    Trevor19, Jun 20, 2025 at 12:51 PM
    Trevor19, Jun 20, 2025 at 12:51 PM
    #34
  7. Jun 20, 2025 at 12:56 PM #35
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Can you leave the jumper wire in andgo see if the compressor turns?
     
    Big Road Skateboard, Jun 20, 2025 at 12:56 PM
    Big Road Skateboard, Jun 20, 2025 at 12:56 PM
    #35
  8. Jun 20, 2025 at 12:58 PM #36
    Trevor19

    Trevor19 Bobtail Member

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    Feb 1, 2023
    0
    No voltage at the compressor with it being jumped and it takes a bit of strength to spin it
     
    Trevor19, Jun 20, 2025 at 12:58 PM
    Trevor19, Jun 20, 2025 at 12:58 PM
    #36
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