battery or alternator?

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  #1  
Old 08-08-03, 07:22 AM
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Location: Pennsylvania
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Question battery or alternator?

I have a 1994 GMC Jimmy, last night the battery indicator was flashing and the bars on the voltage were low. I shut off the truck, measured the voltage on the battery and only got 5.95 volts, when i started it, it went up to 12.1 volts. I always thought the ideal voltage while the motor was running was around 13.5-14 volts. Can it be staying at 12 volts while the motor is running because of a bad battery or do you think something is wrong with the charging system?
Thanks.
Joe
 
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  #2  
Old 08-08-03, 07:36 AM
Joe_F
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Sounds like a finished alternator to me. Get an AC Delco rebuilt from the parts store.

If the battery is four years old or more, pitch it for a new Delco too.
 
  #3  
Old 08-08-03, 02:26 PM
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I really doubt that 5.95 volts will start the engine. Was your meter set to AC volts? If so than your 12 v check was off. If I am wrong than the alt. is generating 6 volts as back to the battery and still running all other accesories Sounds like the alt is ok and a bad battery to me.
 
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