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Watch your volt meter

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Old Mar 20, 2007 | 05:08 PM
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Default Watch your volt meter

I just had my defective alternator replaced. My car has been stored for the winter and the battery was kept charged with a trickle charger. I ran the car about an hour per month just to keep everything working. I took the car out for its first trip Sunday and got about a mile and noticed the volt meter at 9 volts. I returned home and the next day the car would not start so I put a charger on it then drove to a battery station. The alternator wasn't working at all and had a whine to it. The copper windings were black. The battery is in good shape so the whole thing turned out to cost me $112.

About a month ago, on my hour one hour "exercise" run, I noticed the volt meter at about 17 volts for awhile. I thought at the time that seemed a little high. The technician said that an alternator will sometimes start being irregular when going bad. I learned that it is wise to watch that meter. I would have been stuck 60 miles from home at a remote lake. Gary R
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Old Mar 20, 2007 | 05:27 PM
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Thanks for the info. I'm sure someone can use it.
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Old Mar 20, 2007 | 05:29 PM
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I had an alternator go out on a car, it caused me to get stranded on a deserted road at night with my hot date. It couldn't have gone out at a better time!
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Old Mar 20, 2007 | 05:48 PM
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Default Good advice.

I always carry a set of cables in case I need a jump. Did your alternator cost $112 or was that with labor to install it? Good advice...
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Old Mar 21, 2007 | 07:31 AM
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If the alternator goes south and kills the battery a jump will not get you very far at all, maybe a few yards.
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Old Mar 21, 2007 | 07:50 AM
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This only gets you started but you still have a dead battery and no charging system.
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Old Mar 21, 2007 | 03:29 PM
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Originally Posted by BigDR
I always carry a set of cables in case I need a jump. Did your alternator cost $112 or was that with labor to install it? Good advice...
The alternator was $85 and the remaining was labor and tax. I forgot to mention that my volt meter is not real accurate. After the repair, the shop's instrument showed 14.4 volts while my meter showed about 16 volts. I wonder why GM didn't put some marks on the meter between 8 volts and 18 volts? I don't know if all corvettes have that kind of a scale on the meter, but that is what is on my '91. Gary R.
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Old Mar 21, 2007 | 03:35 PM
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Hi, i think my alternator may be foul as well. At the battery terminals, I've been getting a reading of 14.5 volts at idle? Should I be worried, and could this be killing my battery? The battery reads 12.73 volts when not running.
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Old Mar 21, 2007 | 03:53 PM
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Originally Posted by ChickMagnet
Hi, i think my alternator may be foul as well. At the battery terminals, I've been getting a reading of 14.5 volts at idle? Should I be worried, and could this be killing my battery? The battery reads 12.73 volts when not running.
Mine reads 14.5 when cold. Both readings look good to me.
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Old Mar 22, 2007 | 10:18 AM
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I have read that a battery should be 12.1 to 12.2 volts per cell. 12.73 Volts is perfect. My 93 coupe (It's a Ruby) charges at 14.5 to 14.3 volts with no problems.
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Old Mar 22, 2007 | 10:39 AM
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I blew one to pieces racing an LS1 camaro. I wasn't watching the voltmeter.
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Old Mar 22, 2007 | 12:06 PM
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I think an overcharging alternator does more damage then an undercharging one, so it's good you caught that. My experience was that an overcharging was destroys electronics, and undercharging one just leaves me sit.
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