65 dart not charging with new alternator

Early A-Body Discussions

  1. Shaun65dart

    Shaun65dart Well-Known Member

    Messages:
    150
    Likes Received:
    67
    Joined:
    Oct 14, 2017
    Location:
    Lomita, ca
    Local Time:
    11:49 PM
    Hey guys. Frustrated because I’m having trouble figuring this out. 65 dart gt slant 225. All stock besides Petronix ignition. My bearing went bad in my square back alternator. I have two wires in addition to the battery wire. The two wires are green and other is white. On the replacement alternator, looks like there is one terminal for a field wire, and the battery post. When I hook up the alternator with the green field and battery post wire, it’s not charging. The other field wire is just hanging there. I read if you ground the other field to the casing, that should do the trick but it does not. How can I wire this alternator to work correctly? Here’s a picture of the back of my new alternator and the one I took out

    3C747F4D-4AC6-4A8D-B5BF-EE6724AFDE7F.jpeg

    EE65BA93-33BD-4320-B7BC-3333F53920A1.jpeg
     
  2. 66Valiant528

    66Valiant528 Well-Known Member

    Messages:
    482
    Likes Received:
    280
    Joined:
    Aug 20, 2019
    Location:
    Medway Ma
    Local Time:
    2:49 AM
    Someone put a later 2 field alternator in the car . Get a 72 up squarback.
     
    • Agree Agree x 2
    • Professor Fate

      Professor Fate Push the button, Max...

      Messages:
      3,564
      Likes Received:
      5209
      Joined:
      Jan 13, 2020
      Location:
      Wisconsin
      Local Time:
      1:49 AM
      ...And when you get the new alternator, have them test it right away before you even leave the store. Some things you learn the hard way!
       
    • 67Dart273

      67Dart273 FABO Gold Member FABO Gold Member

      Messages:
      54,791
      Likes Received:
      24765
      Joined:
      Oct 14, 2010
      Location:
      Idaho
      Local Time:
      11:49 PM
      Shaun what kind of regulator do you have? 70/ earlier which belongs on the car, and ONLY can be used with the alternator you bought, or the 70/ later "flat" electronic one which has a one piece triangular connector on the alternator. If so you need a 70/ later alternator and I (as mentioned above) would aske for a 73/ later to get "square back"

      YOU CAN EASILY test it right on the car. Jumper 12V to the single field terminal and it should charge "full blast." The one you removed, can be tested same way, just ground either field terminal and feed power into the other one.

      LOOKING at the photo, I am guessing it has been converted to the later 70/ later (which was a roundback with two field terminals) or 72/ later (which is squareback with two field terminals)
       
    • Dana67Dart

      Dana67Dart The parts you don't add don't cause you no trouble FABO Gold Member

      Messages:
      9,585
      Likes Received:
      6932
      Joined:
      Jul 16, 2017
      Location:
      Northern Colorado
      Local Time:
      12:49 AM
      Assumptions...

      1. Your current bad alternator is the square back one in post #1
      2. The round back photo is a stock photo of a single field wire round back alternator
      3. The parts store gave you an alternator based on the car not the current alternator setup.
      4. You have done some testing by shorting to ground some of the field wires ( you may have damaged the voltage regulator)
      At this point you need to post photos of your voltage regulator
      Your current alternator and wiring
      And the replacement alternator.

      That way we all are on the same.

      My best guess as was noted in earlier posts...

      Your alternator and charging system was changed at some time to the newer style that uses an electronic voltage regulator and two field wires on your alternator.

      You purchased an alternator for the origional car which would have been a mechanical regulator and only one field wire.

      After we see photos we can advise, but I would unhook the field wires till we know what you are working with
       
    • Mattax

      Mattax Just the facts, ma'am FABO Gold Member

      Messages:
      14,296
      Likes Received:
      9929
      Joined:
      Feb 7, 2013
      Location:
      Phila. Pa
      Local Time:
      2:49 AM
      Well you may call it stock but that's confusing those who are trying to help here, and maybe you too.

      You've discovered and shown us in previous threads that this car's wiring has been through various alterations and repairs.
      Recently you discovered the previous owner made some changes between the time of the sales ad and actually selling you the car.
      None of my factory gauges work 65 dart gt

      Hard to forget the thread with the damaged battery wire on the ammeter, the push button switch, and some extra sqreeze terminals on the starter relay junction.
      Can someone help? I need to drive my dart tomorrow
      In that final photo it looks like a grounded field alternator and an electronic version of the matching regulator.

      All square backs were isolated field alternators, although you can always ground one of the brushes.
      That's shown here: Identifying Chrysler Alternators (1960-1976)
       
      • Agree Agree x 1
      • Shaun65dart

        Shaun65dart Well-Known Member

        Messages:
        150
        Likes Received:
        67
        Joined:
        Oct 14, 2017
        Location:
        Lomita, ca
        Local Time:
        11:49 PM

        Appreciate the reply. From what I can tell,
        My dart engine is stock besides the pertronix ignition. The PO added a fuel level guage since the original wasn’t working. I’m still learning what’s been done to this car so just trying to work thru it. You referenced a thread posted by me about a previous 65 dart which doesn’t apply in this case since it was a different car. I had a square back alternator that was charging the car just fine. So I’m going to take the advice on here and replace with the newer model alternator that I seemed to have instead of the one that supposedly fits my 65 originally that I basically made a mistake in buying. I’ll let you guys know how it goes thanks
         
      • Dana67Dart

        Dana67Dart The parts you don't add don't cause you no trouble FABO Gold Member

        Messages:
        9,585
        Likes Received:
        6932
        Joined:
        Jul 16, 2017
        Location:
        Northern Colorado
        Local Time:
        12:49 AM
        Rather than throwing more money, post photos so we all can help you understand what is really going on.

        All advice you have been given here is pure speculation since you have not provided photos.

        I don't understand your reluctance to post photos.
         
        • Like Like x 1
        • Mattax

          Mattax Just the facts, ma'am FABO Gold Member

          Messages:
          14,296
          Likes Received:
          9929
          Joined:
          Feb 7, 2013
          Location:
          Phila. Pa
          Local Time:
          2:49 AM
          an isolated field alternator, regulator and wiring is not stock for 1965
          you need to determine what that white wire connects to; ground, the regulator, or ???
           
          • Agree Agree x 1
          • 67Dart273

            67Dart273 FABO Gold Member FABO Gold Member

            Messages:
            54,791
            Likes Received:
            24765
            Joined:
            Oct 14, 2010
            Location:
            Idaho
            Local Time:
            11:49 PM
            Have you actually READ anything that I posted?
             
          • pishta

            pishta I know I'm right....

            Messages:
            23,086
            Likes Received:
            12566
            Joined:
            Oct 13, 2004
            Location:
            Tustin, CA
            Local Time:
            11:49 PM
            IIRC the dual field required a hot ignition to one field and a ground to the second for full boogie output. There were a few round backs that had isolated fields, maybe the first year of the electronic voltage regulator? The old regulators were duty switched with points, on-off-on-off to regulate an average of 14.5V or whatever it was designed to run on. the new electronic regulators used a variable resistance ground to output a constant 14.5V (or whatever they were designed to) to work the new electronic ignition. The square backs were modular in the diodes could be serviced without pressing anything out. If you had a squareback in there and it was charging, you need another isolated field alternator (square or late round) and match it up wire for wire. You may just need a brush or 2 in your old squareback. they are $2.99 a set at a better auto parts store and about 5 minutes of work. And DITTO on testing the 'rebuilt' alternator you buy at a parts store, Many rebuilds wont even pass the machines test procedure. If you were closer to Tustin, Id give you one (oops, I gave them away already)
            ZNyp99iiRygka3RosIkKwk-iIPd_so_FZi1Y6wqLu3FTBoRsG_ISrw7A48qVUVlr6nLre1Nl4IA=w1200-h630-p-k-no-nu.jpg
            upload_2020-10-16_10-1-5-png-png.png
            ?u=https%3A%2F%2Fi.pinimg.com%2Foriginals%2Fa4%2F88%2Fc5%2Fa488c5c6484271dc6a86edcdc66be2b1.gif
             
            Last edited: May 15, 2022
          • pishta

            pishta I know I'm right....

            Messages:
            23,086
            Likes Received:
            12566
            Joined:
            Oct 13, 2004
            Location:
            Tustin, CA
            Local Time:
            11:49 PM
            #3 is an isolated field 70-71 roundback

            back of alt to upgrade1a.jpg
             
          • RustyRatRod

            RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

            Messages:
            86,761
            Likes Received:
            69233
            Joined:
            Jun 7, 2010
            Location:
            Georgia
            Local Time:
            2:49 AM
            Now why would he do a FOOL thing like that? He might actually fix somethin.
            :BangHead:
             
          1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
            By continuing to use this site, you are consenting to our use of cookies.