2006 Thermoking Tripac Issue

Discussion in 'Ask An Owner Operator' started by MyLotion, Oct 10, 2021.

  1. MyLotion

    MyLotion Bobtail Member

    10
    5
    Aug 20, 2019
    0
    Hello! I have an issue concerning a ThermoKing tripac apu (don't we all) and I can't quite figure out the solution to it.

    When I first power on the apu, it runs for about 3-4 minutes and then shuts off and throws an 'alt' code. When I clear the code and run it again, it runs for only 2 minutes, shuts off, then throws the exact same code. The alternator gets very hot, so I am wondering if this has something to do with it overheating.

    However, this is a brand new alternator. My old alternator had a battery overcharge issue, so I went ahead and purchased a new one. After installing the new alternator, I got this issue that I am describing here. (I actually ended up using my warranty and returning the new alternator, after installing and seeing the issue, with another brand new one, but the exact same issue was occurring.

    I also have a brand new ECM, fuel pump and fuel filters. I am absolutely lost as to what this issue could be. The alternator that I am using is a 14.5V 65A.

    Any help is appreciated, thank you.
     
    truckdriver31 Thanks this.
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Snailexpress

    Snailexpress Road Train Member

    2,443
    5,155
    Apr 28, 2014
    Rocky
    0
    I have strong feeling alternator connected in reverse polarity.
     
    truckdriver31 and MyLotion Thank this.
  4. MyLotion

    MyLotion Bobtail Member

    10
    5
    Aug 20, 2019
    0
    Hm... reasoning behind it? I'm confused as to how that would even be possible. The plug can only be inserted one way and I haven't tinkered with the harness at all.
     
    truckdriver31 Thanks this.
  5. 062

    062 Road Train Member

    4,763
    9,752
    Oct 20, 2013
    0
    You also should have a wire to the B+ on the alternator and a ground.
    Use a multimeter and check voltage at battery and B+. If more than a couple tenths difference check all connections and wiring from there to battery for damage. There’s a wire in the harness you mentioned that goes to the B+. It should be the same voltage as the B+.
     
    truckdriver31 Thanks this.
  6. truckdriver31

    truckdriver31 Road Train Member

    6,509
    7,607
    Sep 18, 2013
    0
    did you put it on yourself. if so then my money is on the belt is to tight
     
  7. RedForeman

    RedForeman Momentum Conservationist

    4,347
    19,819
    Jan 30, 2011
    Johns Creek, GA.
    0
    Check the alternator fuse. On the old ones there is a maxi-fuse holder (50A) in the main battery lead to the alternator that gets crusty and burnt up. Originally it's located in a hard to access location down low inside the case. The service kit relocates it to the top of the case, and comes with the necessary pieces to mount it.

    Also check your battery cable terminals on both ends. There are 6 ends to check (3 cables, either 1 or 0 AWG so big ones). Battery + to starter solenoid, starter solenoid to alt B+ (has 50A fuse), and battery neg to engine ground. Don't just "look" at them, take them off, clean them, if you see any moss growing where the crimp is, replace the terminal.
     
  8. truckdriver31

    truckdriver31 Road Train Member

    6,509
    7,607
    Sep 18, 2013
    0
    also check the battery cable going to the main battery on the truck. if this battery is going bad or has issues. then apu can throw Alt code too.
     
  9. Spyro2112

    Spyro2112 Medium Load Member

    505
    320
    Mar 17, 2018
    0
  10. Ridgeline

    Ridgeline Road Train Member

    17,944
    76,328
    Dec 18, 2011
    Michigan
    0
    Yeah what you say is missed all the time.

    if there is a voltage issue, especially with an alternator …

    the very first thing is to confirm there is an actual voltage problem AT THE BATTERIES


    AND


    CHECK YOUR GROUNDS, ALL OF THEM!
     
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  • Draft saved Draft deleted