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Thread: 3G upgrade

  1. #1

    Default 3G upgrade

    I am doing a 3G upgrade on my 85 RS. Is the old 3 wire harness still needed?

  2. #2
    FEP Supporter Broncojunkie's Avatar
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    I had trouble finding detailed info on 1g to 3g conversion. There was also some question as to whether or not your gauge would work correctly. So I just took this route, which is simple and keeps a stock(ish) look under the hood.
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  3. #3

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    If you're refering to the stock alternator harness, no, that goes away with your 1G alternator along with your voltage regulator.

    If you want to keep your amp gauge functional, you'll need to pick up the PA Perf harness: https://lmr.com/item/PA-462802C1/Mus...G-Plug-Upgrade

    You'll also need a fused larger gauge charge cable. Something like this or make your own: https://lmr.com/item/PA-9905/99-04-M...mp-Alternators

    There is also a kit available with an alternator if you don't already have one.


    I don't have any amp gauge so didn't personally use any of the above stuff. Bought pigtails, fuse and battery cable did it all myself. Not terribly hard.

    Thomas

    1985 Mustang GT - Build Thread
    347 (10.5CR, AFR 185's, PP Crosswind Intake, Custom-ground Comp Hyd Roller Cam, Scorpion 1.6 Roller Rockers, Holley 3310-4), T-5, 8.8 w/3.55's, MM SFC's, T/A, PHB, LCA's, STB, KMB, Bilsteins, MM/H&R Springs, SN95 5-Lug, Cobra Brakes, '04 Mach 1 Steering Rack

  4. #4

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    Yes I have everything to install the Alt. Not planing on using the gauge for now. Thanks all for the help.

  5. #5

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    One other thing, where do most of you hook your electric choke to?

  6. #6

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    Wire your electric choke to the white/black stripe wire on your voltage regulator plug. You can kind of make out my splice in my pic above (actual splice done at stator wire connector), the white wire that goes into the wire loom runs to my choke.

    Thomas

    1985 Mustang GT - Build Thread
    347 (10.5CR, AFR 185's, PP Crosswind Intake, Custom-ground Comp Hyd Roller Cam, Scorpion 1.6 Roller Rockers, Holley 3310-4), T-5, 8.8 w/3.55's, MM SFC's, T/A, PHB, LCA's, STB, KMB, Bilsteins, MM/H&R Springs, SN95 5-Lug, Cobra Brakes, '04 Mach 1 Steering Rack

  7. #7

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    Thanks

  8. #8

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    Getting everything prewired and I was wondering where to attach the wire from the "I" terminal. On my alt it is green and red.

  9. #9
    84 Cougar, 90 HO with 700DP, Edelbrock RPM intake, 1.7 RRs, shorty's and SS exh, T-5, KC clutch, Hurst pro billet, line loc, 8.8, 4.10s, suspension mods....blah, blah,blah.

    71 Comet, 289, Liberty TL, 9", 6.00s, 11.9x @ 112.... blah, blah, blah.

  10. #10

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    Connected mine to the existing green/red wire that went to the original (1G) external voltage regulator.
    Thomas

    1985 Mustang GT - Build Thread
    347 (10.5CR, AFR 185's, PP Crosswind Intake, Custom-ground Comp Hyd Roller Cam, Scorpion 1.6 Roller Rockers, Holley 3310-4), T-5, 8.8 w/3.55's, MM SFC's, T/A, PHB, LCA's, STB, KMB, Bilsteins, MM/H&R Springs, SN95 5-Lug, Cobra Brakes, '04 Mach 1 Steering Rack

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