Discrepencies between charging voltage and resting voltage
So, I might have a stupid question. I primarily use my car's stock volt meter, I know that the voltage displayed is not a good representation of the condition of my electrical system. The stock meter just kind of sucks and it measures relatively far away from my amps.
Anyway, let's say I'm sitting idle and just drained my batteries a bit. As soon as the current draw stops (I turn it down) the voltage goes back to the normal operating range. Then, I turn off my Car and the batterys' resting voltage sum is ~12.3v since the alt is turned off and they haven't been charged long enough.
My question is how can I tell when the batteries have been charged enough without turning the car off?
Re: Discrepencies between charging voltage and resting voltage
Are you asking how to tell if there charged with the engine still running ? If thats what your asking you would need to see how many amps the alternator is putting out with ac and stereo off I would like to see it only putting out about 10 amps or less thats the rule of thumb I always went by when I was a mechanic ....also a good resting voltage is between 12.2- 12.5 volts this will vary between batteries
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