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Author
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Topic: Charging system ?
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nash
Journeyman Posts: 77
From: Nashville, TN, USA
Registered: Nov 2000
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posted 07-14-2001 10:39 PM
   
I need some advice on the charging system for 65 mustang. The car keeps running the new battery down. I can watch the voltage drop on it as it runs as I check it with a multimeter. Also, I have pulled off the + cable on the battery while running and car dies. I have taken the altenator to AUtozone and it checks out, also I have put on a new voltage regulator. It seems not to want to charge the battery upa as it runs, but if I charge it on a battery charge the battery will accept the charge and the car will start. Any suggestions on what to check next?
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richard bohm
Gearhead Posts: 373
From: tucson,az-luray,va
Registered: May 2001
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posted 07-14-2001 11:13 AM
sounds to me like you have a short in the system some where. check the alternator first, as sometimes they are the cause.
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sounnder
Journeyman Posts: 30
From: Lompoc, Ca.
Registered: Sep 2000
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posted 07-16-2001 11:25 PM
I had a similar problem on a car owned in a former life. I bought an alternater from NAPA as a replacement. I had the thing bench tested at NAPA prior to taking it home. Installed it and the charging system began over charging. Took the alternator back and it still bench tested ok.  SO, I took the entire car in and had a system diagnostic done. Turns out the alternator had bad dioads (sp), which were not tested during the bench test. Just something to think about. A charging system diagnostic is a guy's best friend at times like that.  ------------------
1968 GT/CS
1965 C code Fastback
(The Rust Bucket)
1990 Thunderbird Super Coup
1994 Bronco
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nash
Journeyman Posts: 77
From: Nashville, TN, USA
Registered: Nov 2000
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posted 07-17-2001 12:01 AM
Is there any way to test the alternator diodes on the bench? My car is not ready to take on the road so I would like to test as much at home as possible or take the components off to be tested. Also, is there any test for a voltage regulator. One thing I noticed when I removed the new one is that it only has 2 coils where as the original had 4 coils. Maybe Napa sold me the wrong one.
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