Alternator Not Charging Battery

[Helirich]

Personally I am in favor of having them rebuilt locally. After my last(and 3rd or 4th total) alternator took a dump, and for 10 years of seeing less than stellar voltage and charge rates, I had mine rebuilt by a shop that has done nothing but starters and alternators for the last 25 years.

Upon installation I was thrilled to see a solid 14+ volts at idle on my gauge. Something I had not seen in a decade.

If you do go down that path, make sure it's a good shop that will redo the windings rather than just dip them.

This is excellent advice if you have a shop like that. Around here they have all gone away. (Like machine shops) I fear the knowledge is going away to.

[painterdave72]

i rebuilt my hervey cs130 last year with a high amp kit...

[Midnight Specialist]

If the alternator is bad and the warranty for a replacement ran out or is null, do yourself a favor and go to your local Autozone and pick up an alternator from a 1994 Chevy Camaro with a 3.4 engine. I'm all for supporting the vendors but when it comes to the starter and alternator, you can't beat a local parts place that offers a lifetime warranty on them.

If you have DPI's new billet Alternator bracket, you may get away with the alternator being a drop in, I believe he makes the mounting point on it longer to fit the aftermarket alternators. If not, you'll need a 1/2 inch spacer to go between the alternator and bracket:

Attachment 66635

Did you swap out the pulley on that alternator or use the one in the pic?

[Chris 16409]

You need to install a V-Belt pulley on the Camaro alternator. If you don't have one or want a new one, I like this aluminum pulley from Summit Racing (March 131).

https://www.summitracing.com/parts/mch-131

[Midnight Specialist]

I put a new alternator in and tested it with the multimeter. I got 13.47 volts. I took it on the road and after a half mile, volts dropped and battery light came on. The battery light works now and the multimeter is showing 12.50 now with the car running. Any ideas?


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[Ron]

Odds are you got a bad one.

Can you post a pic of how it is wired?

[Midnight Specialist]

This is the wiring.


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[Midnight Specialist]

And the tensioner.


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[Michael]

And the tensioner.


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Probably not related but the belt looks like it's rubbing something. Maybe hitting a bolt or pulleys are slightly out of alignment or one has a very deep groove?

[Midnight Specialist]

That’s just the angle. Nothing is rubbing the belt.


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