first mustang, few problems.

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09-03-2008, 10:36 PM

AYEOH5.0

3rd Gear Member

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Join Date: Sep 2008

Location: Bel Air, MD

Posts: 599

first mustang, few problems.

just bought my first mustang, its a 1989 mustang gt 5.0 manual. fixed most of the minor problems except for a few. the only major one is that my alternator gauge sits at about 9 volts. ive checked the volts going across the battery with the car off, which read 12.3 volts. at idle the battery only read 12.6 volts. the gauge goes up while driving and up in the rpm's. is this a bad alternator?

09-03-2008, 10:47 PM

contentsunderpressur

5th Gear Member

Join Date: Nov 2006

Location: Bay Minette Alabama

Posts: 3,080

Yes, the alternator is bad. The volts at the battery while the car is running should be around 14 volts.

09-04-2008, 12:20 PM

Chuckles_5.0

2nd Gear Member

Join Date: Oct 2007

Location: Summerville SC

Posts: 209

Alternator.

09-04-2008, 01:06 PM

mjr46

D.R. THE PATHETIC DORK

Join Date: Jun 2007

Location: West Virginia

Posts: 30,863

have the alt tested

09-04-2008, 04:29 PM

crusin92red5.0

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Join Date: Jul 2005

Location: sleeping with the enemy

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at idle mine sits at about the same maybe a little higher 12.9-13.1 and my alt is fine, but i've always had charging issues. no one can seem to figure it out.

09-04-2008, 05:01 PM

Timspony

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Location: Burnt Hills, NY

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Quote:

Originally Posted by crusin92red5.0

at idle mine sits at about the same maybe a little higher 12.9-13.1 and my alt is fine, but i've always had charging issues. no one can seem to figure it out.

do you have underdrive pulley(s)??