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  1. #1

    Default 3G alternator upgrade procedures to an 85 5.0

    Just got a Taurus fan for my 85. Didn't realize that I'd have to upgrade the alternator just to run it. I've found a V6 Mustang 3G alternator at a local parts yard for $40. Figure I'll grab it. What's involved with installing it into my 85? This was a CFI/AOD car that now been converted to carb/T5. How do I wire it in?
    http://mustangpro.com/fox/

    65 Fastback 5.0/C4
    83 Notch NCSHP SSP 5.0/SROD
    94 Cobra #819 5.0/T5

    JEEPS!
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  2. #2

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    I found this to be helpful
    http://www.corral.net/tech/maintenance/130a-tech.html

    I also think this site has instructions also but I could not find it

  3. #3

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    Quote Originally Posted by 85-5-oh View Post
    I found this to be helpful
    http://www.corral.net/tech/maintenance/130a-tech.html

    I also think this site has instructions also but I could not find it
    Thanks for the link. Seems everything is written for 86-93 EFI cars. Looking for specifically for our older four eyes.
    http://mustangpro.com/fox/

    65 Fastback 5.0/C4
    83 Notch NCSHP SSP 5.0/SROD
    94 Cobra #819 5.0/T5

    JEEPS!
    95 ZJ 5.2
    07 JK 3.8

  4. #4

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    I had my electrician buddy do my car. I can go out and tell you what color the wires are from my harness that i'm using but that's about all i can do to help. The regulator obviously gets eliminated.
    -EVIL SSP-
    '85 KY Highway Patrol SSP Coupe
    Walk around/exhaust clip
    The Stang
    The CVPI
    -David

  5. #5

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    Quote Originally Posted by 85_SS_302_Coupe View Post
    I had my electrician buddy do my car. I can go out and tell you what color the wires are from my harness that i'm using but that's about all i can do to help. The regulator obviously gets eliminated.
    Thanks! Yeah that would help out a lot. That's my challenge is the wiring part. I'm sure some wires need to be upgraded for the extra juice.
    http://mustangpro.com/fox/

    65 Fastback 5.0/C4
    83 Notch NCSHP SSP 5.0/SROD
    94 Cobra #819 5.0/T5

    JEEPS!
    95 ZJ 5.2
    07 JK 3.8

  6. #6

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    I'm pretty sure the only wire we upgraded was the power wire from the alt to the coil. I'll get you pics when get the chance...my GF left our camera at her sister's house. I'll try for a cell phone pic but it'll probably suck.
    -EVIL SSP-
    '85 KY Highway Patrol SSP Coupe
    Walk around/exhaust clip
    The Stang
    The CVPI
    -David

  7. #7
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    im intrested in those pics too.

  8. #8

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    go to paperformance.com

    order their wire with the fuse. it's a 4 guage wire with a 200 amp fuse in the middle of it. I believe your solonoid and battery are on opposite sides of each other, so order the longer wire.

    That goes from the post on the back of the alt to the batt side of the starter relay. The other two wires are simple. Wire per the diagram. One of the small wires goes to the same batt side of the starter relay, the other goes to a key on switched 12v source...that's it.

    You may need to clearance the alt bracket to make it fit. you'll know if you do when you try and bolt it up.
    Jeremy
    -86 mustang SSP X CHP Unit # 3788-bone stock & staying that way
    -66 Mustang, bench seat car,8.8,t5,crate roller 5.0
    -72 Maverick 5.0 resto in process
    -1990 Bronco, 5.8 roller/AOD swap in progress, 4" rancho lift, 33's
    Entire 1986 electrical and vacuum troubleshooting manual download
    http://slantnosefox.com/picturehosti...g%20manual.zip

  9. #9

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    Well now i feel like a jackass because i can't trace the wires up into my harness far enough to get to the OEM wires because i've taped the hell out of it and really don't wanna cut it all open.


    But, i will talk to my buddy who did the wiring for me and i'm sure he can help out some. I just don't know jack about wiring.
    -EVIL SSP-
    '85 KY Highway Patrol SSP Coupe
    Walk around/exhaust clip
    The Stang
    The CVPI
    -David

  10. #10

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    Quote Originally Posted by v8only View Post
    go to paperformance.com

    order their wire with the fuse. it's a 4 guage wire with a 200 amp fuse in the middle of it. I believe your solonoid and battery are on opposite sides of each other, so order the longer wire.

    That goes from the post on the back of the alt to the batt side of the starter relay. The other two wires are simple. Wire per the diagram. One of the small wires goes to the same batt side of the starter relay, the other goes to a key on switched 12v source...that's it.

    You may need to clearance the alt bracket to make it fit. you'll know if you do when you try and bolt it up.
    Alt, Battery, starter, and starter relay are all on the passenger side for the 85 and under 5.0L cars.
    1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD.
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  11. #11
    FEP Member darkwriter77's Avatar
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    Been wondering about this, myself. I've done the 3G swap on a couple of '86+ cars and it's no problem, but the externally-regulated earlier Foxes are a mystery to me as far as the swap goes. I'm assuming you would probably have to snag the stock alternator plug off a junkyard car or get one (if they sell them) from the electrical connector section of someplace like Autozone (y'know, where they have replacement headlamp plugs n' such). Then you'd splice into and extend the wires that normally would go into your external regulator bolted onto the fender and run those over to the plug going into the 3G alternator ... but I haven't a clue which wires get spliced into which wires.
    1986 GMC S-15 ext. cab 2.8 - DAILY BEATER.

    1989 Mustang LX 5.0 notch - T-5, 4.10, alum. DS, KC clutch, Pro 5.0 shifter, O/R-X and Violator cat-back, A/C delete - WEEKEND TOY.

  12. #12

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    I'm bumpin' this to the top to see if anybody else has some input. Picking up the 3G Monday.
    http://mustangpro.com/fox/

    65 Fastback 5.0/C4
    83 Notch NCSHP SSP 5.0/SROD
    94 Cobra #819 5.0/T5

    JEEPS!
    95 ZJ 5.2
    07 JK 3.8

  13. #13
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    Make sure you get the pigtail off the v-6 car make life alot easier.... I ran a 4 gauge wire from the alternator to the hot side of the starter noid jump the yellow wire from the pig tail over to where the 4 gauge connector bolts on and ran a key on wire to the other wire that excites the regulator
    99 gt with 03 cobra swap and tko600
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  14. #14

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    Guys check this site out alot of info The attachment is the wiring diagram for the 3g

    http://fordfuelinjection.com

    Also here is a link to the online auto manuals for all makes of cars it has the eletrical diagrams too ..

    http://search.ebscohost.com/login.aspx?authtype=url,uid

    Username : auto
    Password :auto
    Attached Images Attached Images
    Last edited by Ed-84gt; 05-29-2009 at 05:02 PM.
    1984 Turbo GT, 5.0 swap , T-5, 5 lug, 8.8 3.27 gears ,92 front brake upgrade,

  15. #15

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    Quote Originally Posted by mustangpro View Post
    I'm bumpin' this to the top to see if anybody else has some input. Picking up the 3G Monday.
    Another option is to use a Variable speed controller for the fan.

    http://store.summitracing.com/partde...5&autoview=sku

    This is what I used on my car with a stock alt. w/underdrive pulley and taurus fan with no problems what so ever. I even bought a 3g alt to install but like I said haven't needed it.

  16. #16
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    What about the electric choke? Isn't there a wire from the alternator to the choke?
    85 GT vert

  17. #17
    FEP Member darkwriter77's Avatar
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    Quote Originally Posted by Curtis View Post
    What about the electric choke? Isn't there a wire from the alternator to the choke?
    That's pretty much just a 12v switchable line. You can run that from any 12-volt source that switches on with the ignition in "RUN."
    1986 GMC S-15 ext. cab 2.8 - DAILY BEATER.

    1989 Mustang LX 5.0 notch - T-5, 4.10, alum. DS, KC clutch, Pro 5.0 shifter, O/R-X and Violator cat-back, A/C delete - WEEKEND TOY.

  18. #18

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    i got my 3g out of a taurus, imagine that! same car as you got the fan out of.if its a 95 amp 3g it will fit right in if its a 130 light ones on the taurus is requres notching out the bracket to fit. heres a more direct link to the right page with pics of what needs to be notched. the v6 mustang 3g may not be a 130amp it may be 95 im not sure

    http://fordfuelinjection.com/?p=75
    86 w/87 motor,full cage, gutted interior,5 lug, H&R front springs, SVO A arms, jeggster subframe connectors, driveshaft loop, 2007 mustang bullitts, 25th anniversary dash, 87+ qrtrs....
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  19. #19
    FEP Member darkwriter77's Avatar
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    The '94-'95 Mustang alternators are 130-amp according to parts store listings.

    http://www.autozone.com/autozone/cat...065&questions=[]
    1986 GMC S-15 ext. cab 2.8 - DAILY BEATER.

    1989 Mustang LX 5.0 notch - T-5, 4.10, alum. DS, KC clutch, Pro 5.0 shifter, O/R-X and Violator cat-back, A/C delete - WEEKEND TOY.

  20. #20
    FEP Senior Member 85 Speedfreak's Avatar
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    Quote Originally Posted by Ed-84gt View Post
    Guys check this site out alot of info The attachment is the wiring diagram for the 3g

    http://fordfuelinjection.com

    Also here is a link to the online auto manuals for all makes of cars it has the eletrical diagrams too ..

    http://search.ebscohost.com/login.aspx?authtype=url,uid

    Username : auto
    Password :auto
    That site is very informative.nice find!

  21. #21

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    my 90 3.0 taurus alt was a 130 amp...though I've heard many were actually less.

    I hooked up my 3g plain and simple to my 66, and it's not going to be any different on a 4 eyed carb'd car.

    Hook up the 4 guage fat cable to the batt side of the starter solonoid, and the other end to the post on the ALT.

    This leaves 2 wires, skinny ones..if you took the junkyard harness. If not, paperformance has the plug for the alt.

    one wire goes to the batt side of the starter relay, and the other gets a 12v key on source THAT"S IT!! The online diagrams will tell you which wire is which

    if you're unsure where a 12v key on source is, run a wire from the radio power wire into the engine bay
    Jeremy
    -86 mustang SSP X CHP Unit # 3788-bone stock & staying that way
    -66 Mustang, bench seat car,8.8,t5,crate roller 5.0
    -72 Maverick 5.0 resto in process
    -1990 Bronco, 5.8 roller/AOD swap in progress, 4" rancho lift, 33's
    Entire 1986 electrical and vacuum troubleshooting manual download
    http://slantnosefox.com/picturehosti...g%20manual.zip

  22. #22
    FEP Member darkwriter77's Avatar
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    Quote Originally Posted by v8only View Post
    my 90 3.0 taurus alt was a 130 amp...though I've heard many were actually less.

    I hooked up my 3g plain and simple to my 66, and it's not going to be any different on a 4 eyed carb'd car.

    Hook up the 4 guage fat cable to the batt side of the starter solonoid, and the other end to the post on the ALT.

    This leaves 2 wires, skinny ones..if you took the junkyard harness. If not, paperformance has the plug for the alt.

    one wire goes to the batt side of the starter relay, and the other gets a 12v key on source THAT"S IT!! The online diagrams will tell you which wire is which

    if you're unsure where a 12v key on source is, run a wire from the radio power wire into the engine bay
    Instead of running the one wire to the battery side of the starter relay, wouldn't it be easier just to run it to the 4-gauge post on the back of the alternator, since that cable also connects to the battery side of the solenoid?
    1986 GMC S-15 ext. cab 2.8 - DAILY BEATER.

    1989 Mustang LX 5.0 notch - T-5, 4.10, alum. DS, KC clutch, Pro 5.0 shifter, O/R-X and Violator cat-back, A/C delete - WEEKEND TOY.

  23. #23

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    DOH! You got me..typo...I did mean that I ran it between the alt and relay..NOT the starter
    Jeremy
    -86 mustang SSP X CHP Unit # 3788-bone stock & staying that way
    -66 Mustang, bench seat car,8.8,t5,crate roller 5.0
    -72 Maverick 5.0 resto in process
    -1990 Bronco, 5.8 roller/AOD swap in progress, 4" rancho lift, 33's
    Entire 1986 electrical and vacuum troubleshooting manual download
    http://slantnosefox.com/picturehosti...g%20manual.zip

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