What should the battery voltage be when car is running? on 2010 Toyota Corolla

What is considered low voltage?

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4 answers
14.6 would be high normal, 13.5v would be acceptable battery charging voltage. Check voltage across the battery terminals, leave the black ground wire at the battery post (-) move the red volt lead to the large wire post at the alternator if the voltage is different you have a voltage drop (youtube voltage drop there is a good video there). At rest engine off battery voltage should be 12.6 volts at rest if battery is charged and good.
Anything below 13.5 volts with loads like lights, A/C and wipers on. No less than 13.5 volts.
CHARGING VOLTAGE SHOULD BE ABOVE 13.2