Hemi Alternator Wiring

New Hemi Engine Swaps

  1. thedartsport

    thedartsport Well-Known Member

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    Hey all, trying to figure out what I’m doing wrong with my alternator on my Hemi swapped Challenger. I used the old style external regulator and wired my exciter to it and one of the two wires coming from the plug on the alternator. 12 volts when the key is on. Then I wired the output to the battery, but it will not charge while running. Is there something about the new alternators I’m missing? I have a good ground at the regulator. I used the diagram attached in the pictures. Thanks!
     
  2. thedartsport

    thedartsport Well-Known Member

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    3B285019-3397-4356-8661-A4CA03D2F7BF.jpeg 66658C64-573C-4499-96EF-AAF5CA942C33.jpeg B92B1978-DB82-4550-A725-3A32C9D0C014.jpeg 289D977F-5E2C-48BE-AA7C-20BC3C8F72ED.jpeg 3B285019-3397-4356-8661-A4CA03D2F7BF.jpeg 66658C64-573C-4499-96EF-AAF5CA942C33.jpeg B92B1978-DB82-4550-A725-3A32C9D0C014.jpeg 289D977F-5E2C-48BE-AA7C-20BC3C8F72ED.jpeg
     
  3. tonysrt

    tonysrt FABO Gold Member FABO Gold Member

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    Doesn't that alt. have a built in regulator?
     
  4. thedartsport

    thedartsport Well-Known Member

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    Negative. These were regulated by the computer from the factory.
     
  5. 408 swinger

    408 swinger FABO Gold Member FABO Gold Member

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    Pre-Eagle or Eagle? The 08 older alternators will work. The Eagle alternators won't work that way. They are controlled Waaaay different than the early ones. They are both regulated through the PCM, but, the early ones you can control via the old regulator. Bouchillon has a write up on their site.
     
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    • 67Dart273

      67Dart273 FABO Gold Member FABO Gold Member

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      You are going to have to send a link because I see nothing over there. I was under the impression that the newer Magnum/ hemi alternators were still isolated field just like 70/ later Mopar back in the day
       
    • 408 swinger

      408 swinger FABO Gold Member FABO Gold Member

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      • thedartsport

        thedartsport Well-Known Member

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        Pre Eagle. It’s a 2006. I put a ground to the green field wire and the alternator started charging, so I’m thinking it’s a bad regulator now.
         
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        • 67Dart273

          67Dart273 FABO Gold Member FABO Gold Member

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          Is the regulator FOR SURE grounded? That mount looks a bit rusty.
           
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          • thedartsport

            thedartsport Well-Known Member

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            Yes it’s got a good ground. Even ran a jumper wire straight from the negative battery post to ground it and nothing changed.
             
          • loganscuda

            loganscuda DON’T reMember

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            I have an 05 and do not use a regulator.
             
          • 408 swinger

            408 swinger FABO Gold Member FABO Gold Member

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            I wonder if the op has carb'd his.
             
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            • Kiddart1

              Kiddart1 Well-Known Member

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              I had to swap the wires on the plug for mine to charge, it was weird but she charges great now.
               
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              • thedartsport

                thedartsport Well-Known Member

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                Ended up being a bad voltage regulator out of the box. Tried another one I knew worked, and it’s been charging ever since. Thanks all.
                 
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                • tonysrt

                  tonysrt FABO Gold Member FABO Gold Member

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                  Could it be your 05 Alt. came from a different vehicle? At this point in time with things changing so rapidly who knows what works and what doesn't work.
                   
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