• Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech

3g alternator wiring

  • Thread starter Thread starter cotarisk
  • Start date Start date Jun 8, 2011
C

cotarisk

New Member
Jun 8, 2011
1
0
0
hawaii
Jun 8, 2011
#1
  • Jun 8, 2011
  • #1
I have just installed a new 3g alternator from a 94 ford f=150 4.9 liter. it was putting out 14 something volts when we finished install and started it up. but then a fuse was blown and the next day the battery was dead. i need a wiring diagram with explanations to where each wire goes and why. i put the charging wire to the pos. battery post instead of the solenoid. i also have a resistor in the line but no idiot light...
 

PoppyMod

Member
Jun 27, 2010
617
6
19
Severna Park, MD
Jun 8, 2011
#2
  • Jun 8, 2011
  • #2
cotarisk said:
I have just installed a new 3g alternator from a 94 ford f=150 4.9 liter. it was putting out 14 something volts when we finished install and started it up. but then a fuse was blown and the next day the battery was dead. i need a wiring diagram with explanations to where each wire goes and why. i put the charging wire to the pos. battery post instead of the solenoid. i also have a resistor in the line but no idiot light...
Click to expand...

Hi Bud,
It's easy. Just Google for the diagram. They are all over the place.
Good Luck!
 

Tim65GT

Active Member
Feb 24, 2004
1,149
2
39
West Texas
Jun 8, 2011
#3
  • Jun 8, 2011
  • #3
The resistor takes the place of the Alt warning lamp (idiot light)

here is the diagram with some explanation:

 

horseballz

10 Year Member
Sep 30, 2009
824
19
49
Las Vegas, NV
Jun 8, 2011
#4
  • Jun 8, 2011
  • #4
Please forgive me for sort of hi-jacking this thread, but..... Is the 3G alternator internally regulated? If so, what needs to be done at/with wiring at the original regulator connector? My car is a 68, if that makes any difference.
Thanks,
Gene
 

rbohm

Founding Member
Apr 12, 2002
6,698
550
204
tucson,az
Jun 8, 2011
#5
  • Jun 8, 2011
  • #5
horseballz said:
Please forgive me for sort of hi-jacking this thread, but..... Is the 3G alternator internally regulated? If so, what needs to be done at/with wiring at the original regulator connector? My car is a 68, if that makes any difference.
Thanks,
Gene
Click to expand...

yes the 3G is internally regulated. the power wire to the old regulator can be extended and hooked up to the starter solenoid. the other wires can be taped off.
 
You must log in or register to reply here.

Similar threads

3
Electrical Starter solenoid green wire?
  • 387lx
  • Jun 1, 2026
  • Fox 5.0 Mustang Tech
Replies
3
Views
137
Fox 5.0 Mustang Tech Jun 2, 2026
AeroCoupe
Alternator not charging
  • SchwarzStock
  • Jul 6, 2026
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
1
Views
46
1965 - 1973 Classic Mustangs -General/Talk- Sunday at 4:07 AM
apple99Mustangdude
A
A
Resolved Electrical Help Please
  • Alabama
  • Jan 22, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
2
Views
269
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jan 22, 2026
AeroCoupe
Electrical Ron Francis Headlight / Alternator Harness
  • dan50
  • Apr 30, 2026
  • Fox 5.0 Mustang Tech
Replies
0
Views
208
Fox 5.0 Mustang Tech Apr 30, 2026
dan50
C
Electrical HELP! 1989 5.0 Stick, Voltage Bleed onto Ignition Trigger wire
  • ChickenDeluxe
  • May 14, 2026
  • Fox 5.0 Mustang Tech
Replies
7
Views
216
Fox 5.0 Mustang Tech May 24, 2026
ChickenDeluxe
C
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific 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?