upgrading a Mopar with Ford-parts... 3G Alternator!

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  • BigBlockMopar
    Superhero BangShifter
    • Nov 2007
    • 3498

    #1

    upgrading a Mopar with Ford-parts... 3G Alternator!

    Yeah I know it sounds like something too impossible to believe for some, but I finally found something that could be seen as an upgrade to a Mopar, by using a Ford part...

    I've been annoyed for some time now by the fact that the average '60/70's Mopar alternator stops charging when engine rpm's drop below 600 rpm orso.
    Since my engine runs on LPG, I got it idling around 500 in drive/550 neutral.

    During evening drives, at pretty much at every stopsign the ALT-gauge in the car pegs to almost full discharge. Even more if rains and fan is on.

    To solve this issue (since I don't want to increase the idle-rpms), I wanted to try out a modern alternator and see if these things DO charge at lower rpm's.
    So a friend got me a 90's Ford "3G" alternator to try out. I ordered an electrical connector for it to complete it's 'internal' wiring.

    Another issue was the 3G alternator used a serpentine pulley, while my car still has v-belts.
    I decided to make a double row v-belt pulley on my lathe, with a slightly smaller diameter than the smallest pulley I already had in my stash.

    Mounted the alternator under the hood with a simple curved strip of aluminium, and also decided to run the headlights through a relay, to keep the lightswitch from frying out.

    After everything was connected again I measured the voltage delivered by the alt, and it was still charging, even with the engine in Drive, lights and defrost-blower-fan on...


    Attached Files
    www.BigBlockMopar.com
  • fast Ed
    Superhero BangShifter
    • Dec 2007
    • 2625

    #2
    Which version did you use, the 95A or 130A? (I think there are some other variations as well.) At least the look of the 3G alternator somewhat mimics the old Chryco units as far as the fins go, it certainly doesn't look too out of place. That will now be the best part on the whole car!! LOL I kid ... I love Mopars too.


    cheers
    Ed
    Ed Nicholson - Caledon Ontario - a bit NW of Toronto
    07 Mustang GT with some stuff
    88 T-Bird Turbo Coupe 5-speed

    Comment

    • BigBlockMopar
      Superhero BangShifter
      • Nov 2007
      • 3498

      #3
      Well I thought the 3G's only came in a 130A-version. I'll do some digging to find out how one can recognise one from the other.
      It's from a somewhat early 90s Thunderbird.
      www.BigBlockMopar.com

      Comment

      • BigBlockMopar
        Superhero BangShifter
        • Nov 2007
        • 3498

        #4
        It looks I have a 'small case' alternator, so 95amp version.

        How to tell the difference between large and small case 3G series alternators. A visual guide to the differences.
        www.BigBlockMopar.com

        Comment

        • DanStokes
          Ancient LSR Guy
          • Oct 2007
          • 28450

          #5
          Nice installation! Looks like it came there. Even better that it does the job.

          Dan

          Comment

          • Deaf Bob
            No Life Outside BangShift.com
            • Feb 2012
            • 19255

            #6
            Could it be that the smaller pulley is making the charge, not so much the alt?
            Looks good, job got done!

            Comment

            • TheSilverBuick
              ALMOST Spidey !
              • Nov 2007
              • 22145

              #7
              Nice adaptation!
              Escaped on a technicality.

              Comment

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