09-04-2017, 09:33 PM
It could be either ground or a positive lead. First step typically is to clean all battery and cable connections. Or put your meters negative lead on engine block and positive lead on positive battery post. If you show 12V on meter it probably isn't ground so start walking your meter upstream on the positive side from battery bank to disconnect switch. It's not unusual for cable connections (positive or ground) to loose connectivity or for disconnect switches to go bad.
