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

Is 130amp alt. enough? Pulley Question.

  • Thread starter Thread starter dec322
  • Start date Start date Jun 19, 2006
D

dec322

Member
Feb 11, 2006
401
2
16
Bham AL
Jun 19, 2006
#1
  • Jun 19, 2006
  • #1
I'm changing over to a 3g alt in the next week. I've been looking into buying an alternator for a 94 mustang from the local parts store for around $150-$170. I've also been looking at 200 amp alts on ebay for close to the same price. Here is my thinking:

1. I'll probably never put in an electric fan.
2. My stereo will probably be pumping 500-800 watts to a sub.
3. I like the lifetime warranty from the parts store.
4. I'm wierd about buying electric parts for my car from ebay.

I think 130 should be plenty but I wanted to check with yall.

Also, I've got a smaller crank pulley. Will this affect the size of pulley needed on my alt. I've noticed some people have to get a smaller or larger pulley. How will I know if i needed a different alt. pulley for my application?

Thanks.
 
S

sloco7

New Member
Jun 17, 2006
4
0
0
Jun 19, 2006
#2
  • Jun 19, 2006
  • #2
3g

Most 3g's have a larger pulley than a 65 amp alt. Leaving a smaller crank pulley should'nt be a problem. 200 amp is overkill, I think. If you install it and don't get enough juice, you can get an overdrive pulley for it. It's amazing these cars run with stock alt's. :SNSign:
pun
 
S

speedytang

Founding Member
Jul 28, 1999
765
1
17
Marengo,Ohio,US
Jun 20, 2006
#3
  • Jun 20, 2006
  • #3
I installed a 130amp and I can have every power item on with both power windows going down and pull only 83 amps. I dont have a electric fan but I have on. Headlights,Running Lights(GT),Rear Defrost, Air Condition,Stereo, Emergency Blinkers, Blower Fan on High, PMS, Brake lights on and Power Windows going Down. I have 62amps at Idle (780rpm).
 
D

dec322

Member
Feb 11, 2006
401
2
16
Bham AL
Jun 20, 2006
#4
  • Jun 20, 2006
  • #4
Well then, I'll be buying my 3G 130 amp alt. today or tomorrow and will install it this weekend.....I CAN'T WAIT!!
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
33
129
Jun 20, 2006
#5
  • Jun 20, 2006
  • #5
Speedy, how do you draw so little juice with all that stuff on? How are the volts with a full load at idle? I manage to discharge a 160-alt charging system at 660 RPM.
 
You must log in or register to reply here.

Similar threads

What's your tow rig?
  • LILCBRA
  • May 31, 2026
  • Other Auto Tech
Replies
3
Views
115
Other Auto Tech May 31, 2026
LILCBRA
M
Progress Thread mnky99 2001 V6 evap core, ac compressor, heater core replacement
  • mnky99
  • Sep 5, 2025
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
1
Views
475
1996 - 2004 SN95 Mustang -General/Talk- Sep 5, 2025
mnky99
M
A
2001 Mustang GT, scorched metal smell and noise from trans/diff?
  • AndyE2255
  • Dec 1, 2025
  • SN95 4.6L Mustang Tech
Replies
4
Views
432
SN95 4.6L Mustang Tech Dec 28, 2025
gkomo
Progress Thread Restoration progress on my 92 GT
  • AnthonyA1234
  • Oct 19, 2024
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
28
Views
2K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Mar 6, 2025
Mac131
J
Progress Thread Family member 1989 GT- Backstory and updates
  • JRC99
  • Apr 19, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
15
Views
1K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Oct 26, 2025
JRC99
J
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?