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Old 12-24-2005, 05:04 PM   #60
HotRoddin
cranky old man
 
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Join Date: Sep 2001
Location: Longview Texas
Posts: 683
Default Re: voltage across battery when charging ?

Quote:
Originally Posted by Mustang_289
Currently we've got a Powermaster 1-wire alt on the car, not sure how these alts turn on.
Well that blows my theory all to heck !!

I must have read the posts wrong ... didn't know you had a 1 wire alt.

I'd rev it up like 82 Gt said, to make sure it's "excited", then turn on all accessories to load it down ... then take your volt meter and measure from ground (make sure its a good ground !!) to the battery term. then to the battery clamp, then to the cable as it comes out of the clamp, then to the first conn. at the other end of the cable, then the conn. to the alt itself ... somewhere you are dropping 2 or 3 volts and you should be able to find it fairly easy.

If you are getting 12.3 volts even at the back of the alt. then measure the voltage between the alt. case and the neg battery terminal ... should be zero ... if you're close to that, then your alt just isn't turning on ... in your case isn't getting "excited" ... a problem i've never had

If none of that gains you any new info then i think it's time for a trip to the local auto electric shop.

Rod
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