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Alternator wiring diagrams: 1G, 2G, and 3G

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  • Johnnymex
    replied
    Hi, Im looking for the wiring diagram for the 81 crown vic and by any chance the wiring diagram for the 88 any one that can help, thanks in advance.

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  • sly
    replied
    keep the 3g's pulley. it works that much better and the lower RPM will save the bearings in the long run.

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  • fmansfield444
    replied
    I'm about to do this to my car tomorrow. I got the 3G and all the wiring and fuse. Only question is should I keep the 3g's pulley or put my 1g's smaller pulley on the 3G? I've read though some threads and couldn't find much info.

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  • L1011tristar17
    replied
    ^ That's what I ended up doing as well.

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  • sly
    replied
    I had to drill out the hole on the one I put on my 88 for the long bolt to fit. I also had to use a nut/bolt setup on the top since the used one was not threaded.

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  • L1011tristar17
    replied
    I'm trying to install the 3G alternator, but the lower bolt from the original doesn't fit the new alternator, it's too big. Has anyone else encountered this problem? I don't know if I need a smaller bolt or to drill out and make the hole bigger.

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  • Piece-it pete
    replied
    Alt conversion done! 1G and external regulator ripped out, 3G in. The minor wire mods were easy but did take a little thought. Not all wire colors on the diagram were correct (I think, my compartment is dirty. White/black looked quite yellow) but heck it's only a couple wires. Used the 98+ F150 wire mentioned. That put the new main fuse right at the brace for the AC compressor, zip tie there, picked up a 32" battery cable, cut off the clamp and ran it over to the battery, main fuse to hose for emmisions crap on fender, ziptie, then to battery. The stock belt was difficult to get on (the 3G doesn't go over to 'loose' as far) but once over the lip was fine. Also I did have to ream out the bottom bolt hole in the casing just a little. As Gadget mentioned, on a CFI you need to tap the choke heater wire into the white/black jumper on the 3G.

    Results? I think the car runs better than it did when the 1G was working. And surprisingly (or maybe not?) the stereo sounds much better particularly at higher levels. Bass is obviously tighter and clearer.

    Many thanks to the fine gentlemen here at GMN.

    Pete

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  • Piece-it pete
    replied
    Originally posted by Piece-it pete View Post
    Oh and I should have to cut and join two wires at the Regulator for 'hot in run' right? Anyone know which ones? And just abandon the other two?

    Pete
    Oh I see, I can just pick a wire

    Pete

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  • Piece-it pete
    replied
    Oh and I should have to cut and join two wires at the Regulator for 'hot in run' right? Anyone know which ones? And just abandon the other two?

    Pete

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  • Piece-it pete
    replied
    I've got an 85 which is I believe a 1G. There is still no difference in the swap, and I cut out the external regulator, correct? Also Gadget mentioned the choke heater which I see is the W/BK wire, I can just splice the heater wire into that?

    Pete

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  • 1987cp
    replied
    Originally posted by BerniniCaCO3 View Post
    As I walk back to the car, planning my next trip to the junkyard but pleased I'd figured it out, I notice something.
    I'd gone ahead and replaced the brushes for good measure.
    To install them, there's a pin that holds back the springs. I'd sworn I'd removed it, but i think I switched regulators from a rebuilt one back to motorcraft at one point.
    Ooooh. No wonder it tested good at the 'yard and then subsequently refused to work! I would never have thought of that, as I've never replaced alternator brushes - I've always just taken a known-working alternator and tossed it on the car.

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  • BerniniCaCO3
    replied
    oh, feel free to. I did-- what else can you do after wasting hours uninstalling, rewiring, reinstalling an alternator only to find out it was a stupid little pin I'd forgotten to pull?

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  • sly
    replied
    rolling on the floor laughing however...

    glad you got it sorted. at least it ended up being simple.

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  • hypostang
    replied
    Glad you got it figured out ..and I promise i did not chuckle

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  • BerniniCaCO3
    replied
    Hahahahahaha, sorry guys for all the posts... figured it out.
    So, once I'd rechecked my wiring for the dozenth time, I mean come ON! The 3g upgrade is not rocket science, and I was getting really frustrated.
    Your posts and photos confirmed I'd definitely had it correct.

    So finally I take the alternator to pepboys and have it retested. I'd tested it at salvos last month, what could possibly have changed sitting in a bin...
    And as it goes down the test, the results for voltage: FAIL regulator: FAIL diodes: FAIL.
    Heh, well that explains that.

    As I walk back to the car, planning my next trip to the junkyard but pleased I'd figured it out, I notice something.
    I'd gone ahead and replaced the brushes for good measure.
    To install them, there's a pin that holds back the springs. I'd sworn I'd removed it, but i think I switched regulators from a rebuilt one back to motorcraft at one point.
    It was still in there.

    The brushes never had contact with the alternator!
    I take it back in to pepboys, borrow a pair of pliers, pull the pin, test it, passes: put it on the car, and 15V. Whew!

    Leave a comment:

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