Quote:
Originally Posted by NoHaveMSG
I guess I should elaborate a little more and I am a bit too lazy to search it right now. Most 12v batteries are in the 12.6-13.3v range when fully charged. If the car had been running for any amount of time when checked the voltage should be up around 13. Though if he had load tested it before it could have pulled off the residual charge, though 12.6 is on the low end of that.
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This is what I go by:
"Battery Voltage and State of Charge:
12.66v . . . . . . . . . . 100%
12.45v . . . . . . . . . . 75%
12.24v . . . . . . . . . . 50%
12.06v . . . . . . . . . . 25%
11.89v . . . . . . . . . . 0%
(NOTE: these readings are at 80 degrees F. Battery voltage readings will drop with temperature roughly 0.01 volts for every 10 degrees F.)
(At 30 degrees F. a fully charged battery will measure about 12.588 volts, and at zero degrees F it will measure about 12.516 volts.)
CHECK BATTERY CHARGING VOLTAGE
After charging the battery or jump starting the car, connect the voltmeter to the battery the same as before and not the charging voltage.
A charging system that is operating normally should produce about 13.8 to 14.3 or more volts at idle. If the charging voltage is less than 13.0 volts, the alternator is not putting out enough voltage and current to keep the battery charged."
End of quote.
(I scraped that off the Internet, so it must be true -
)
humfrz