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Thermoking evo APU alternator not charging

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by D.Tibbitt, Sep 7, 2020.

  1. Sep 7, 2020 #1
    D.Tibbitt

    D.Tibbitt Road Train Member

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    Went and put a new alternator on my apu ... turned it on and it went straight to like 15.5 volts. And higher... So i immediatly turned it off and unhooked all the ground wires thinking it was not grounding well, cleaned all the terminals....

    Hook everything back up and now it is not charging, wont go past 12.3 volts....

    Think i fried the alternator when it went to 15.5 ? Short in wiring ? Batteries? Any idea ?

    Have taken it apart and put it back together like 4 times already .. Cant figure it out..
     
    D.Tibbitt, Sep 7, 2020
    D.Tibbitt, Sep 7, 2020
    #1
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  3. Sep 7, 2020 #2
    Dave_in_AZ

    Dave_in_AZ Road Train Member

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    Should have taken it to Arizona Laser Alignment when you were home.

    They work on tri pacs.

    Sounds like a wire rubbing.

    They are really good and tracking that stuff down.

    They'll get you a reman alternator too for less than your $540 paper weight.
     
    Dave_in_AZ, Sep 7, 2020
    Dave_in_AZ, Sep 7, 2020
    #2
    D.Tibbitt Thanks this.
  4. Sep 7, 2020 #3
    tiddlytanker

    tiddlytanker Light Load Member

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    Memory is fuzzy but when we had to change our evolution alternator, it was a different amperage and therefore to the belt size had to change. I think it was due to different pulley sizes.

    Not sure if this is your issue but it is something to keep in mind.
     
    tiddlytanker, Sep 7, 2020
    tiddlytanker, Sep 7, 2020
    #3
    D.Tibbitt Thanks this.
  5. Sep 7, 2020 #4
    D.Tibbitt

    D.Tibbitt Road Train Member

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    Thank u i will check that out. , i should have never taken it apart , the other alternator was charging but i kept getting alt codes all the time , and it would never turn off if i left it on standby mode. Would run all day long. I figured it was a bad ground and was shorting out, but i think i just opened up a whole new can of worms
     
    D.Tibbitt, Sep 7, 2020
    D.Tibbitt, Sep 7, 2020
    #4
  7. Sep 7, 2020 #5
    D.Tibbitt

    D.Tibbitt Road Train Member

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    That is what i get for thinking i was gonna knock out an easy apu job today.... Lol
     
    D.Tibbitt, Sep 7, 2020
    D.Tibbitt, Sep 7, 2020
    #5
    Brettj3876 and Dave_in_AZ Thank this.
  8. Sep 7, 2020 #6
    062

    062 Road Train Member

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    It wasn’t picking up the battery voltage is why it went to 15v. Take a good look at the wire from the B+ on the alternator to the voltage regulator and the main power wire all the way to the batteries.
     
    062, Sep 7, 2020
    062, Sep 7, 2020
    #6
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  9. Sep 7, 2020 #7
    Dave_in_AZ

    Dave_in_AZ Road Train Member

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    Don't feel bad. TK warranties stuff for 2 years.

    My compressor was replaced 26 months ago, and I think it may have died.
     
    Dave_in_AZ, Sep 7, 2020
    Dave_in_AZ, Sep 7, 2020
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    D.Tibbitt Thanks this.
  10. Sep 7, 2020 #8
    tiddlytanker

    tiddlytanker Light Load Member

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    I had the wiring harness and alternator fail on my APU at the same time. The wiring harness was corroded and was replaced by thermoking $900 parts and labor.
     
    tiddlytanker, Sep 7, 2020
    tiddlytanker, Sep 7, 2020
    #8
    Dave_in_AZ and D.Tibbitt Thank this.
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