Meaning, when I have trhe ignition on, but car not started, what should be the reading on the voltmeter for a healthy battery? When I do this in my GTA, it reads only 9 to 10 volts. I put in my other battery from my daily friver and it had just 10 volts. Are both these batteries getting low ? Should the voltage read 12 for a healthy battery ?

Thanks

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88 GTA Charcoal Grey Bone Stock except for loose muffler which makes it a bit louder than normal.

 

Check the voltage at the battery w/ a real voltmeter, dash guages are notoriously inaccurate. If either of those batteries can start a car they have better than 12V, not 9 or 10.
I know a healthy battery will have some change over 12V at rest. If it is near/below 12V it is probably dead. At least thats been my experience. With the car running you should see 13.8V+.
...ed

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Ed Maher - Moderator @ The Carb Board
92 Z28 Convertible - Quasar blue / Tan top
LB9 4L60 GU2 G80 - stock, soon to be sleeper
-=ICON Motorsports=-

- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die

 

The volt meter in my 92R/S reads exactly the same. You are OK, the meter's a piece of crap.

Beartracks