1999 Chevy S-10 battery? alternator?

1999 CHEVROLET S-10
75,000 MILES • 6 CYL • 2WD • AUTOMATIC
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MARTY1115
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The alternator and battery have been replaced within the past two weeks and it is still a toss up as to whether the car will start or not (usually not). It will run with a jump. The last tow truck driver suggested that the battery I purchased is no good but could not give specifics. Are there really any BIG differences between batteries?
Jul 7, 2010 at 8:49 PM
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INTERNETMECHANIC
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Use a digital multimeter across the battery posts, everything turned off. The generic spec for a fully charged battery is 12.6 volts. If the battery is down, take it off and get it charged, not a good idea to let alternator try to charge it.

Also, with the meter leads at the battery posts, have a helper turn the key to crank, watch the voltage, it shouldn't drop below 9 or 10 volts. You have to do testing when the problem is ongoing. When the problem occurs, did you try cranking in neutral? The purple wire at the starter solenoid S terminal should be hot with the key in the crank position, check when the problem is ongoing.
Jul 8, 2010 at 3:46 PM
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