93 mustang charging problem

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tom2001gt

Founding Member

May 20, 2002

292

0

16

Delran N.J.

Mar 23, 2010

#1

• Mar 23, 2010

• #1

I have a 93 mustang and the battery light came on yesterday so i checked and it only had around 12.5 volts running. I went out and got a new Alt and put it on and it was charging around 14.5. It was fine the first few times i drove it now the battery light comes on and off. I took it home put my meter on it and it was charging around 14 volts at idle then a few min later it will just drop down to 12volts then start working again.
Anyone have any suggestions?

 

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palma411

New Member

Mar 21, 2010

7

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0

Houston, Tx

Mar 23, 2010

#2

• Mar 23, 2010

• #2

I had the same problem on my 1988 GT, I installed a 130 amp 3G alternator on it and it took care of the problem. If I am not mistaken you should have the 2G alternator 65-75 amps on there with a regulater plug and a rectifier plug. The swap is quite simple if not you can upgrade the inside of your current alternator to about 100 amps or so.

 

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tom2001gt

Founding Member

May 20, 2002

292

0

16

Delran N.J.

Mar 23, 2010

#3

• Mar 23, 2010

• #3

well the car is all stock It dont have Under drive pullies or anything so i dont know what is causing this problem.

 

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ebk06

Member

Feb 23, 2007

113

12

18

Mar 23, 2010

#4

• Mar 23, 2010

• #4

Fox bodies have underpowered alternators even when brand new. I'd say upgrade to a 3g and be done with it. Its also possible you got a faulty "new" alternator. It happens quite often.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

33

129

Mar 24, 2010

#5

• Mar 24, 2010

• #5

I'd also go get that new alt bench tested. Because the issue is intermittant, it might not act up while you're having it tested.

 

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tom2001gt

Founding Member

May 20, 2002

292

0

16

Delran N.J.

Mar 24, 2010

#6

• Mar 24, 2010

• #6

I was thinking it might be a bad Alt, I got another mustang im gonna swap them today and see if the problem goes away.

 

Stever89

5 Year Member

Dec 14, 2009

536

9

39

Biloxi, MS

Mar 24, 2010

#7

• Mar 24, 2010

• #7

Wouldn't hurt to check all your connections too.

 

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tom2001gt

Founding Member

May 20, 2002

292

0

16

Delran N.J.

Mar 24, 2010

#8

• Mar 24, 2010

• #8

Put the Alt from my other mustang in and its working fine now guess I just got a bad one.

 

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Kingflirt1

New Member

Mar 24, 2010

3

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0

Mar 24, 2010

#9

• Mar 24, 2010

• #9

i also switched to a 3g alternator with 200 amps. i have a mark 8 fan on it that sucks 30 amps itself. even with a stock alternator in a stock car still sucks when you turn your headlights on, fogs , heater or a/c. i noticed that when my car war stock.