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

Electric Fan problem after one month HELP!!!!

  • Thread starter Thread starter btsclan
  • Start date Start date Jul 2, 2008
B

btsclan

Member
Feb 22, 2004
64
0
6
Seattle, WA
Jul 2, 2008
#1
  • Jul 2, 2008
  • #1
About a month ago I installed a 3G alternator and an electric fan out of a Taurus. Well within the last week, my volt gauge is getting lower and lower. When I first installed the set up, and when I would be idling with the fan on and my head lights on the volts would be pretty high, around 13 or 14 volts. Now when I idle with the fan on and headlights the volt gauge reads closer to 12 and 12.5. My battery is under a year old and it tests just fine. Also I did a complete install of the new alternator with the 150 amp fuse, 4 gauge wire to starter solenoid and a 4 gauge ground wire.

Whats going on with my car?? I dont understand, the only thing I can think of is when I installed the alternator with the new 4 gauge wire I didnt solder the connectors on the end of the wire, I only crimped them on. Has anyone had this problem? Its driving me crazy seeing my volt gauge drop lower then it did before I put the new 130 amp 3G in there.

Any help would be greatly appreciated!
 

2BADSTANGS

Member
Jun 19, 2008
385
1
18
Colorado
Jul 2, 2008
#2
  • Jul 2, 2008
  • #2
I'd have the alternator tested. The soldering of the connectors is a good idea, but crimping should'nt have that drastic of an effect.
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
33
129
Jul 3, 2008
#3
  • Jul 3, 2008
  • #3
Another vote for getting the system dynamically tested or the alt bench tested. You might have dropped a diode.

If you feel like it, check that the voltage at the charge stud is close to the same as that at teh battery. And that the sense circuit is very close to the charge stud voltage.

Disconnect the stator wire and the regulator plug. Check resistance in the stator circuit. It should be under 1 ohm as I recall.

Also look for signs of overheating at the charge cable connections. Bad connections create heat, which creates resistance, which creates heat. This snowballs recursively.

Good luck.
 
You must log in or register to reply here.

Similar threads

S
Electrical Alternator not charging after terminator 2 install.
  • Sfab79
  • Aug 24, 2025
  • Fox 5.0 Mustang Tech
  • 2
Replies
32
Views
673
Fox 5.0 Mustang Tech Yesterday at 6:29 AM
AeroCoupe
A
Resolved Electrical Help Please
  • Alabama
  • Jan 22, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
2
Views
253
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jan 22, 2026
AeroCoupe
Engine Themostat
  • Mindseye007
  • Jan 30, 2026
  • Fox 5.0 Mustang Tech
  • 2
Replies
21
Views
666
Fox 5.0 Mustang Tech Feb 1, 2026
86HO5.0
8
A
Electrical electric mirror switch issue...
  • alchemist1
  • Apr 18, 2026
  • Fox 5.0 Mustang Tech
Replies
1
Views
98
Fox 5.0 Mustang Tech Apr 19, 2026
2000xp8
W
Electrical 91 GT Alternator Replacement Question
  • willrh111
  • Oct 22, 2025
  • Fox 5.0 Mustang Tech
Replies
6
Views
315
Fox 5.0 Mustang Tech Oct 23, 2025
nickyb
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?