If I read voltage across the negative post to the disconnected negative cable in my car, what should it read? I did this and it reads over 12 volts. I am trying to find the cause of a drain.
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anywhere from 12 to 14 volts is fine it would actually be unusual for it to run below 14 volts, dont ask why i have no clue. have you ever looked at your cars voltmeter when the cars running it almost always reads above 12 volts -
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