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

3G Alternator upgrade

  • Thread starter Thread starter 91five-o
  • Start date Start date Oct 16, 2004

91five-o

New Member
Nov 16, 2002
287
0
0
Maple Ridge British Columbia
Oct 16, 2004
#1
  • Oct 16, 2004
  • #1
I'm using 4 guage wire from the alternator to the solenoid and im just wondering what size fuse i should use in my fused line? Thanks

Rick
 

90mustangGT

I felt sorry for girls because
Founding Member
Jan 15, 2002
2,773
17
89
Dallas, GA
Oct 16, 2004
#2
  • Oct 16, 2004
  • #2
I don't run any fuse, but I've heard that a 200amp fuse is recomended.
 

91five-o

New Member
Nov 16, 2002
287
0
0
Maple Ridge British Columbia
Oct 16, 2004
#3
  • Oct 16, 2004
  • #3
so would it be safe to run no fuse at all?
 
R

Rerun

Founding Member
Mar 31, 2002
312
0
16
South Bay, California
Oct 16, 2004
#4
  • Oct 16, 2004
  • #4
I run a 200 AMP circuit breaker fuse. I know people running without a fuse, but it's probably not the best bet, if something happens you'll kick yourself in the ass for not buying a 13 dollar part.
 
2

2002BLGT

Well-Known Member
Dec 18, 2003
2,945
4
59
Bedford VA
Oct 16, 2004
#5
  • Oct 16, 2004
  • #5
can I do this and just run the stock 2 wires and an extra 6-8 gauge with a 100 amp fuse ????
 

jrichker

StangNet's favorite TOOL
In Remembrance. Thank you for your contributions
Mar 10, 2000
27,512
2,813
234
Dublin GA
Oct 16, 2004
#6
  • Oct 16, 2004
  • #6
2002BLGT said:
can I do this and just run the stock 2 wires and an extra 6-8 gauge with a 100 amp fuse ????
Click to expand...
Under no circumstances connect the two 10 gauge black/white wires to the 3G alternator. If the fuse blows in the 4 gauge wire, the two 10 gauge wires will be overloaded to the point of catching fire and burning up the wiring harness.
 

jrichker

StangNet's favorite TOOL
In Remembrance. Thank you for your contributions
Mar 10, 2000
27,512
2,813
234
Dublin GA
Oct 16, 2004
#7
  • Oct 16, 2004
  • #7
91five-o said:
I'm using 4 guage wire from the alternator to the solenoid and im just wondering what size fuse i should use in my fused line? Thanks

Rick
Click to expand...

Use a 125-150 amp fuse for 4 gauge wire.
 
N

notchman90

New Member
Oct 7, 2004
87
0
0
long isle, ny
Oct 16, 2004
#8
  • Oct 16, 2004
  • #8
I have 4 gauge wire and have it to a 100amp anl.
 

TRWXXA

Member
Jan 18, 2003
190
1
19
RIGHT BEHIND YOU!!!... Made you look.
Oct 16, 2004
#9
  • Oct 16, 2004
  • #9
2002BLGT said:
can I do this and just run the stock 2 wires and an extra 6-8 gauge with a 100 amp fuse ????
Click to expand...



You bring your car, I'll bring the marshmallows!
 

91five-o

New Member
Nov 16, 2002
287
0
0
Maple Ridge British Columbia
Oct 17, 2004
#10
  • Oct 17, 2004
  • #10
Having a problem with the intall. I mounted the alternator and tried to install the Ford OEM pully off my original alternator (1991 vintage). When I tightened this pulley up, the alternator won't spin freely with this pully. Do I need a pully off an SN alternator or I am I doing something wrong.

Rick
 
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
184
Fox 5.0 Mustang Tech Apr 30, 2026
dan50
3
Electrical Starter solenoid out of space?
  • 387lx
  • Jan 22, 2026
  • Fox 5.0 Mustang Tech
Replies
3
Views
314
Fox 5.0 Mustang Tech Jan 23, 2026
387lx
3
Electrical Alternator not charging after terminator 2 install.
  • Sfab79
  • Aug 24, 2025
  • Fox 5.0 Mustang Tech
  • 2
Replies
38
Views
766
Fox 5.0 Mustang Tech Yesterday at 3:25 PM
AeroCoupe
F
Electrical From scratch: alternator wiring
  • fox racer v2
  • Jun 23, 2025
  • Fox 5.0 Mustang Tech
Replies
0
Views
547
Fox 5.0 Mustang Tech Jun 23, 2025
fox racer v2
F
F
Alternator Not Charging
  • Fri Guy
  • Aug 29, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
7
Views
379
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Aug 31, 2025
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?