TriPac Apu

Discussion in 'Trucks [ Eighteen Wheelers ]' started by mitmaks, Jan 7, 2017.

  1. earnies2

    earnies2 Medium Load Member

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    May 17, 2012
    Dedham, MA.
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    Can you take a picture of the wire? What amp fuse is in it? what location is it?
    What was the problem that you started looking?
     
    mitmaks Thanks this.
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  3. Donny_0920

    Donny_0920 Bobtail Member

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    1
    Jan 23, 2022
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    4amp in line fuse located inside the apu engine compartment, wire looks to have had a connector on the end of it. Apu motor did not run for 2 years because of broken motor mounts. It’s the only other fuse in the apu engine compartment besides the big fuse. continuity test of wire says it’s the SEN wire in control board box. apu would not shut off automatically, just kept running, no artic package, new batteries, SEN test point in control box tested 0 volts, should see battery voltage. When I hooked the end of the wire in the engine compartment to a 12v source it shows battery voltage in control box and apu shut off like it should. Just wondering where that wire in the engine compartment should go
     
  4. Donny_0920

    Donny_0920 Bobtail Member

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    Jan 23, 2022
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    Thank you all for your input as well, good to know there are people that will help! I can post a picture tomm when I get to the shop
     
  5. 062

    062 Road Train Member

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    Oct 20, 2013
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    Should be able to hook it to the B+ on the alternator.
    @reeferwrencher
     
    reeferwrencher Thanks this.
  6. Donny_0920

    Donny_0920 Bobtail Member

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    Jan 23, 2022
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    Thank you, seems like perfect length to go there, appreciate it
     
  7. mitmaks

    mitmaks Road Train Member

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    May 16, 2014
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    On mine it looks like it goes to starter maybe alternator
     

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  8. Donny_0920

    Donny_0920 Bobtail Member

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    Jan 23, 2022
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    Thank you sir! Think I found it, on my alternator the blade terminal still had the connector attached, works as it should now
     
    shatteredsquare Thanks this.
  9. reeferwrencher

    reeferwrencher Medium Load Member

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    Aug 4, 2018
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    Just leave it hooked to 12 volts in the box.If I remember right the factory wiring was to the starter.As usually with tripac it was a bad idea as the wire and fuse were exposed to the weather.The logic I guess was to have it hooked directly to battery voltage for a more accurate reading.Tripac is a classic example of why mechanics tend to dislike engineers.
     
    lilillill and 062 Thank this.
  10. lilillill

    lilillill Sarcasm... it's not just for breakfast

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    Nov 7, 2007
    Possum Booger, Alabama
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    I disconnected that wire on my old truck and ran it directly from the controller to the batteries. Much shorter run, eliminated about 10 feet of wire.
     
    reeferwrencher Thanks this.
  11. reeferwrencher

    reeferwrencher Medium Load Member

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    Aug 4, 2018
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    Yeah I just used to hook to 12 volts in the box and leave it.Sometimes when truck batteries get changed or disconnected mechanics miss some of these smaller wires when they reconnect the cables.Seen it many a time but if you re working on your own equipment you re more likely to make sure it s done right.
     
    lilillill Thanks this.
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