battery on 2004 Pontiac Grand Am

if my battery is bad and can not hold a charge will that keep my car from cranking. the reason i ask is I tried to start my car would not start and even when I charged it. Can this cause me to have to reset the computer in it? Or how will this effect the computer in it? I tried to hook up to the computer but the battery didnt have enough power in it. I am going to buy a new one just curious on how this effects it.

by in Jacksonville, FL on February 17, 2011
1 answer 1 comment
ANSWER by on February 17, 2011
The computer in your car needs a minimum voltage before it will operate normally about 9 volts. A fully charged battery should have a standing voltage of 12.6 volts and pass both a hydrometer test and high rate discharge test (its a load test). A sulphated or bad battery will not hold a charge and may even have an internal open or short within the battery. Put a volt meter across the battery terminals with the engine off, at rest the battery voltage should be 12.6 volts if the battery is fully charged. Now get a friend to start the car while you watch the voltmeter, the voltage reading across the battery should read approximately 14.6 volts if the alternator is charging correctly.
COMMENT by on February 17, 2011
I turned the key on and off not rapidly but enough to let the light come on then off 3 times and then the fourth time tried and start it. It sounded terrible for a sec but cranked right up. I waited a bit and cranked it again no problem. I am a little stunned it worked but it seems to be running fine now. Except for the tension pully bearing sounding like crap. But I can replace the easy.
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