Quote:
Originally Posted by Mister Moose
Right.
I'd think you could also jump from a 12V car that wasn't running. The current draw would drag the 12V surface charge off and lower the voltage across the 6V battery to 9-10 volts depending on the strength of the 12V host battery. Of course you don't want to do this very long, or you'll have 2 dead cars.
This is better than from a running car where the alternator is trying to keep it at 13.8-14 volts.
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A little off subject.
Not sure I would want to do this. Would think you would get some arcing at the battery posts and a voltage drop on the 12v battery. Even with the 12v car not running, key off, not sure what this could do to the electronics/alternator/sensors of a modern car?
Do not know what would happen if you removed the battery lead on the 12 v car, do you take the chance of losing settings when the battery is disconnected for a length of time?