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Large Case Alt Wiring Diagram

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    #1

    Large Case Alt Wiring Diagram

    I'm working with a '91 Vic with the large case alt. It doesn't charge anymore. i'm wondering which wire would be the charge light wire. So I can convert to a 3g. Also, what wiring can I delete? The car had the heated front windshield (de-icer) option at one time. What do I do with the wires coming off of the alternator relay (in front of the battery). Any help is greatly appreciated. Thanks,
    ~John
    Tags: None
    #2
    I'm curious to see how this differs from the small case alt...I didn't think it would be that different but I'm probably wrong
    sigpic


    - 1990 Ford LTD Crown Victoria P72 - the street boat - 5.0 liter EFI - Ported HO intake/TB, 90 TC shroud/overflow, Aero airbox/zip tube, Cobra camshaft, 19lb injectors, dual exhaust w/ Magnaflows, Cat/Smog & AC delete, 3G alternator, MOOG chassis parts & KYB cop shocks, 215/70r/15s on 95-97 Merc rims

    - 2007 Ford Escape XLT - soccer mom lifted station wagon - 3.0 Duratec, auto, rear converter delete w/ Magnaflow dual exhaust

    - 2008 Mercury Grand Marquis Ultimate Edition - Daily driver - 4.6 2 valve Mod motor, 4R75E, 2.73s. Bone stock

    Comment

      #3
      green/red on the I terminal of the voltage regulator is the one you want.


      I think he means the external regulator model. Thats the only large size alternator that came on the Vic.
      86 Lincoln Town Car (Galactica).
      5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

      91 Lincoln Mark VII LSC grandpa spec white and cranberry

      1984 Lincoln Continental TurboDiesel - rolls coal

      Originally posted by phayzer5
      I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

      Comment

        #4
        You'll also want to get familiar with the tsb that covered bypassing the heated windshield option.

        Alex.

        Comment

          #5
          Originally posted by GM_Guy View Post
          You'll also want to get familiar with the tsb that covered bypassing the heated windshield option.

          Alex.
          Got a link for that? I'd be interested in knowing the proper way to do it. I suspect its not just leaving the wires lay in the windshield tray as I've seen done before.
          86 Lincoln Town Car (Galactica).
          5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

          91 Lincoln Mark VII LSC grandpa spec white and cranberry

          1984 Lincoln Continental TurboDiesel - rolls coal

          Originally posted by phayzer5
          I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

          Comment

            #6
            I will check that out tomorrow. I'll look it up and I'll post the TSB mangs. I'll get back to you guys later. Btw Thain, there is no red/green wire on the regulator or the alternator itself. I'm going to assume its somewhere in the windshield module or whatever it's called.

            Comment

              #7
              Its whatever goes to the I terminal. Usually its green/red but maybe it changes color somewhere from the heated windshield stuff. Theres a box for that over by the battery.
              86 Lincoln Town Car (Galactica).
              5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

              91 Lincoln Mark VII LSC grandpa spec white and cranberry

              1984 Lincoln Continental TurboDiesel - rolls coal

              Originally posted by phayzer5
              I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

              Comment

                #8
                That's the alternator relay. The TSB states to locate the heated windshield control module, unplug the connector, remove wire number one, tape it up, and reconnect the connector. Then put the bat, and alt wires on the alternator relay on the alt stud on the relay. And basically, that's the proper way to disable it. Found my fuck up. And I fixed it, the alternator charges fine now.

                Comment

                  #9
                  is there any way to keep the heated windshield
                  sigpic
                  1986 Crown Victoria 302 Cold Air,Mac Shorty headers, Full Dual Exhaust with Super Forty Flows, Wagon Suspension with a Full Sound System Replacement 1/4 time 17.486 @ 77.43mph

                  Comment

                    #10
                    If the heated windshield is not cracked, yes. You can also replace it with a new heated windshield for probably way more than the car is worth. 2000 or so.

                    Comment

                      #11
                      heated windshileds are the one with yellowish tint right?
                      sigpic
                      1986 Crown Victoria 302 Cold Air,Mac Shorty headers, Full Dual Exhaust with Super Forty Flows, Wagon Suspension with a Full Sound System Replacement 1/4 time 17.486 @ 77.43mph

                      Comment

                        #12
                        yes. gold almost.
                        sigpic


                        - 1990 Ford LTD Crown Victoria P72 - the street boat - 5.0 liter EFI - Ported HO intake/TB, 90 TC shroud/overflow, Aero airbox/zip tube, Cobra camshaft, 19lb injectors, dual exhaust w/ Magnaflows, Cat/Smog & AC delete, 3G alternator, MOOG chassis parts & KYB cop shocks, 215/70r/15s on 95-97 Merc rims

                        - 2007 Ford Escape XLT - soccer mom lifted station wagon - 3.0 Duratec, auto, rear converter delete w/ Magnaflow dual exhaust

                        - 2008 Mercury Grand Marquis Ultimate Edition - Daily driver - 4.6 2 valve Mod motor, 4R75E, 2.73s. Bone stock

                        Comment

                          #13
                          Funny, it seems to me somehow that we have a sticky on just this topic .... :waiting:
                          2012 Mazda5 Touring | Finally working on the LTD again!

                          Comment

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