Replacing Excitor wire with Copper & Resistor

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  • Beach_Dude
    327 Rambler
    • Mar 03, 2011
    • 583
    #1

    Replacing Excitor wire with Copper & Resistor

    Beating this dead horse but no actual diagrams to demonstrate placement.

    1977 Jeep Cherokee w/Motorcraft Alternator and Regulator

    All new and custom wiring harness with original placement, except for slight modifications and I really want to nip this pulse in the keister.

    Which line was the original exciter wire, which is now going to be copper with proper resistance?

    Point A, B, or C?



    Point A seems that it would lower the charge to the battery.

    Point B seems that it would be proper placement given that it bypasses the battery charge and adds resistance to the regulator, which would excite the alternator.

    Point C Seems to lower the overall power to the entire system, which could benefit the system to not overcharge, blow fuses/burn out bulbs, etc.

    Anyone familiar?
    Last edited by Beach_Dude; 06-18-2016, 12:47 PM.
    1977 Jeep Cherokee Chief
    360 w/ MC 4350
    All stock but ignition and slightly modified suspection
    Original paint, garaged/non-op for over 15 years
    Tags: None
  • JeepJeepster
    350 Buick
    • Sep 04, 2014
    • 835
    #2
    I shouldnt reply since idk the in's and out's of the 77. Its certainly NOT C.

    It may be the wire coming right out of the alternator field terminal.

    You dont need the resistor wire. You could just put a diode in.
    2004 Jeep Liberty
    1998 Jeep ZJ 5.9
    1994 Jeep ZJ I6
    1989 Jeep Grand Wagoneer 360

    Comment

    • Beach_Dude
      327 Rambler
      • Mar 03, 2011
      • 583
      #3
      Spoke with a knowledgeable guy that's redone a few broncos and has knowledge on the Motorcraft alternator and charging systems.

      Obviously the Jeep system is WAY off, but after going through the wiring diagrams with him, he said Point B seems to be the most logical, giving the battery the higher boost while engaging the alt.

      And the verdict is I don't know if it's really charging or not now... LMAO

      So, it's steady, and at 0, unless I turn everything on, then it drops to about -10. Also, an old problem of lowering the tailgate window now shuts off the stereo meaning there isn't enough juice to keep the stereo on. It appears as if Point B actually dropped the entire system down to like 5V... crazy!!!

      I ended up trying a 3Ohm resistor now, and everything seems pretty stable. Also, I bought a bunch of new connectors, including the voltage regulator connector. Tomorrow I'm going to add a bunch of disconnects to the leads and experiment with connecting the black wire (43 Black 16).

      Will keep ya guys posted!
      Last edited by Beach_Dude; 06-18-2016, 08:10 PM.
      1977 Jeep Cherokee Chief
      360 w/ MC 4350
      All stock but ignition and slightly modified suspection
      Original paint, garaged/non-op for over 15 years

      Comment

      • tgreese
        approaching Ristows' level of B.S
        • May 29, 2003
        • 11682
        #4
        The Motorcraft alternator does not use a resistance wire, according to the wiring diagram. The field connection where the exciter current goes comes from and is under the control of the regulator. The resistance wire is a design feature of the Delco alternator. The Delco needs this extra component since it uses a single wire to provide on/off and exciter current.

        If I were going with a new harness, I would get rid of the unreliable and less common Motorcraft alternator and regulator and use a Delco 10SI. The Delco app is shown on your '77 diagram, since the 232s and 258s got the superior Delco alternator in 1977. The resistor is clearly seen in the Delco part of the diagram.
        Last edited by tgreese; 06-19-2016, 01:41 PM.
        Tim Reese
        Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
        Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
        Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
        GTI without the badges: '95 VW Golf Sport 2000cc 2D
        ECO Green: '15 FCA Jeep Cherokee KL Trailhawk

        Comment

        • serehill
          Gone,Never Forgotten.
          • Nov 22, 2009
          • 8619
          #5
          Dotto

          Originally posted by tgreese
          The Motorcraft alternator does not use a resistance wire, according to the wiring diagram. The field connection where the exciter current goes comes from and is under the control of the regulator. The resistance wire is a design feature of the Delco alternator. The Delco needs this extra component since it uses a single wire to provide on/off and exciter current.

          If I were going with a new harness, I would get rid of the unreliable and less common Motorcraft alternator and regulator and use a Delco 10SI. The Delco app is shown on your '77 diagram, since the 232s and 258s got the superior Delco alternator in 1977. The resistor is clearly seen in the Delco part of the diagram.
          Couldn't have said it better.

          80 Cherokee
          360 ci 727 with
          Comp cams 270 h
          NP208
          Edlebrock performer intake
          Holley 4180
          Msd total multi spark.
          4" rusty's springs
          Member, FSJ Prissy Restoration Association

          If you can't make it better why waste your time. No use repeating the orignal mistakes. I'm to old to push it that's why.

          Comment

          • Beach_Dude
            327 Rambler
            • Mar 03, 2011
            • 583
            #6
            The thing is that I want to leave it pretty original.

            However, I've found the culprit!!!!

            I ended up ordering an original Motorcraft regulator: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

            Over the last fifteen years I've replaced the voltage regulator at least a dozen times in hopes of resolving this problem, and every time ended in FAILURE!!!

            Amazon has the original Ford Motorcraft part and IT WORKS!!!! YAY!!!

            Do not buy any aftermarket parts is the huge lesson.
            Last edited by Beach_Dude; 06-24-2016, 10:19 AM.
            1977 Jeep Cherokee Chief
            360 w/ MC 4350
            All stock but ignition and slightly modified suspection
            Original paint, garaged/non-op for over 15 years

            Comment

            • serehill
              Gone,Never Forgotten.
              • Nov 22, 2009
              • 8619
              #7
              Glad to see you got it

              Yeah those system really have a Vacuum to them.


              Good luck.

              80 Cherokee
              360 ci 727 with
              Comp cams 270 h
              NP208
              Edlebrock performer intake
              Holley 4180
              Msd total multi spark.
              4" rusty's springs
              Member, FSJ Prissy Restoration Association

              If you can't make it better why waste your time. No use repeating the orignal mistakes. I'm to old to push it that's why.

              Comment

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