• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

WTF? 3g problems. Need help fast

  • Thread starter Thread starter rdharper02
  • Start date Start date Jun 11, 2006

rdharper02

like kicking myself in the junk
10 Year Member
May 8, 2006
703
237
84
Jun 11, 2006
#1
  • Jun 11, 2006
  • #1
Got my upgraded 3g alt for my 93 gt yesterday. Its been one of those days and I'm having a heck of a time with the write ups. Heres what I have right now.
From the factory the white wire on the "D" plug is connected to the smaller plug. Is this right? I read the articles and it seems that it should connect to the wht/blck wire from the old harness. The D (3g plug also has a grn/orng wire and a ylw/wht wire. Where the heck do these go if I'm only using the wht/blk off of the old harness? (going to cap off the blk/orng's)



Right now I have my hood up and every previously posted article minimized. Helllppppppp!
 

rdharper02

like kicking myself in the junk
10 Year Member
May 8, 2006
703
237
84
Jun 11, 2006
#2
  • Jun 11, 2006
  • #2
bump
 

rdharper02

like kicking myself in the junk
10 Year Member
May 8, 2006
703
237
84
Jun 11, 2006
#3
  • Jun 11, 2006
  • #3
bump
 

rdharper02

like kicking myself in the junk
10 Year Member
May 8, 2006
703
237
84
Jun 11, 2006
#4
  • Jun 11, 2006
  • #4
bump
 

rdharper02

like kicking myself in the junk
10 Year Member
May 8, 2006
703
237
84
Jun 11, 2006
#5
  • Jun 11, 2006
  • #5
bump again
 

fox racer

Member
Jun 22, 2004
577
0
16
Staten Island, NYC
Jun 11, 2006
#6
  • Jun 11, 2006
  • #6
ok the plug witht the 2 black/oragne wire, cut off. take the white wire and put on the grey connector (if you bought a kit) . then plug the other harness onto the alternator and run the white wire to the single connector right next to it. then run a 4 gauge cable from the little gold stud on the back of the alt to the positive battery side of the starter solenoid.
 

jrichker

StangNet's favorite TOOL
In Remembrance. Thank you for your contributions
Mar 10, 2000
27,512
2,811
234
Dublin GA
Jun 11, 2006
#7
  • Jun 11, 2006
  • #7
I am very careful to maintain backwards compatibility, so I did things a little different. The white/black stator wire gets the insulation stripped back about 1 1/2" in the middle of the wire & cut in the middle of the stripped area. Then a short length of white wire with a 1/4" slip on female spade connector gets spliced on to the white/black wire. Slide on enough 1/4" heat shrink tubing on the white wire to cover the solder splice you are going to make. Next all 3 wires get soldered together & the heat shrink tubing gets shrunk. When you finish, the white/black wire looks like a "Y" with 1 white arm and 1 white/black arm. I left the black/orange wires connected to the original plug and did not do anything to them. When you are done, the original plug still has all the wires connected to it and they are still functional. The extra white pigtail wire that you spliced, soldered in & covered with heat shrink tubing is just long enough to plug into the 3G without much left over.

I ran the 4 gauge wire under the front of the engine next to the 4 gauge wire for the starter power feed.
It came up the same path as the fuel injector supply lines, and gets bolted to the power output lug of the 3G alternator. The 125 amp fuse is mounted on a plastic panel bolted to the stock ignition coil mounts. One of side of the fuse has a 4 gauge wire connected to the battery side of the starter solenoid & the other to the 4 gauge power feed wire for the alternator.

I had some 1" silicone aircraft heat shield tubing that I fed the 4 gauge alternator power feed wire through and tie wrapped & clamped it in place with some aircraft cushion clamps. That provided the wire extra protection from road debris and rocks. Some heater hose could be used to do the same thing.

Apart from the grinding I did on the mount bracket, there wasn't much to it. Rather than just grind a notch, I ground the whole web back to the thick part of the bracket. It looks much more factory that way.
 

rdharper02

like kicking myself in the junk
10 Year Member
May 8, 2006
703
237
84
Jun 11, 2006
#8
  • Jun 11, 2006
  • #8
I appreciate it guys. Thanks for replying. Hopefully I have all the info I need. Problem is that my tensioner doesnt want to release pressure. Is this common on foxes.
Signed
Another Fox Newbie
 

rdharper02

like kicking myself in the junk
10 Year Member
May 8, 2006
703
237
84
Jun 11, 2006
#9
  • Jun 11, 2006
  • #9
Bump
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
33
129
Jun 11, 2006
#10
  • Jun 11, 2006
  • #10
Are you using a breaker bar on the tensioner? I've used a 3/8" ratchet, but it takes some muscle compared to the breaker.

Good luck.
 

rdharper02

like kicking myself in the junk
10 Year Member
May 8, 2006
703
237
84
Jun 11, 2006
#11
  • Jun 11, 2006
  • #11
Got it. I used a deadblow a couple of times and it will allow me to draw it back again. Seems to be fine. Must have been in a bind..?
 

gruvee87vertgt

20+ Year Stangneter
Oct 7, 2003
272
26
28
Chicago, Il
Jun 11, 2006
#12
  • Jun 11, 2006
  • #12
yeah, the 3 g u[grade can be difficult...especially cause there's like 10 different directions on how to do it.
 

rdharper02

like kicking myself in the junk
10 Year Member
May 8, 2006
703
237
84
Jun 12, 2006
#13
  • Jun 12, 2006
  • #13
Having problems. Getting low output. Could be my engine ground, the alt, the 100amp (getting a 150) or the factory 95 pulley.
 
D

dec322

Member
Feb 11, 2006
401
2
16
Bham AL
Jun 20, 2006
#14
  • Jun 20, 2006
  • #14
Did you get it fixed? How is the charge now? I'm about to partake in this adventure and I'm searching and reading everything I can find.
 
You must log in or register to reply here.

Similar threads

Electrical Ron Francis Headlight / Alternator Harness
  • dan50
  • Apr 30, 2026
  • Fox 5.0 Mustang Tech
Replies
0
Views
179
Fox 5.0 Mustang Tech Apr 30, 2026
dan50
F
Electrical From scratch: alternator wiring
  • fox racer v2
  • Jun 23, 2025
  • Fox 5.0 Mustang Tech
Replies
0
Views
527
Fox 5.0 Mustang Tech Jun 23, 2025
fox racer v2
F
1
Electrical 1985 mustang gt Led conversion trouble
  • 1985fox
  • Jan 5, 2026
  • Fox 5.0 Mustang Tech
Replies
10
Views
526
Fox 5.0 Mustang Tech Jan 15, 2026
1985fox
1
B
Electrical No charge from 3g alternator
  • BigShowJoe
  • Nov 9, 2024
  • Fox 5.0 Mustang Tech
  • 2
Replies
20
Views
1K
Fox 5.0 Mustang Tech Nov 18, 2024
Mustang5L5
A
Resolved Electrical Help Please
  • Alabama
  • Jan 22, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
2
Views
241
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jan 22, 2026
AeroCoupe
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?