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Alternator wiring mod(s)?


markinms

Member
Supporting Member
U.S. Military - Veteran
V8 Engine Swap
TRS 20th Anniversary
Joined
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Messages
180
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Points
18
Location
MS
Vehicle Year
1987
Make / Model
Ford
Engine Type
V8
Engine Size
5.0L EFI
Transmission
Automatic
2WD / 4WD
4WD
Total Lift
4"
Tire Size
31 X 10.5 X 15
My credo
Duty, Honor, Country
87 BII 4X4, 5.0L & AOD.

I installed 1998 Explorer FEAD. I read the alternator is a 130 amp 4G. The wiring is simply a 2-wire plug and a "bat" wire that may or may not go to the Bat (+) or starter relay on my installation.

My BII alternator wiring runs to a three pin plug on the driver's side, then into the firewall. I'm assuming the large wire goes to the fuse panel, not sure though as wiring diagrams I have don't really show for sure.

Most diagrams I've seen here on TRS and on the internet show the large wire running to the starter relay or bat (+). This is how the bat is charged. Alternator upgrade articles in the tech session even show this and the need to upgrade the wiring to handle a 130 amp alternator.

Now with all that said, has anyone else installed the Explorer FEAD and used the 4G 130 amp alternator? How did you modify the stock BII/Ranger wiring? Did you run the large wire like the original or connect it to the bat (+) or starter relay?

Any and all help is appreciated.

Thanks!

Mark
 
Last edited:


markinms

Member
Supporting Member
U.S. Military - Veteran
V8 Engine Swap
TRS 20th Anniversary
Joined
Mar 28, 2017
Messages
180
Reaction score
17
Points
18
Location
MS
Vehicle Year
1987
Make / Model
Ford
Engine Type
V8
Engine Size
5.0L EFI
Transmission
Automatic
2WD / 4WD
4WD
Total Lift
4"
Tire Size
31 X 10.5 X 15
My credo
Duty, Honor, Country
Thanks for the link.

I was able to figure out what I needed to do by locating an image of a 4G alternator installed in an Explorer. Once I could see the wiring, I knew what to do. Works great now.

Once again, thanks for the help!

Mark
 

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