Quote:
Originally Posted by 30 Closed Cab PU
If you do it, make sure your accessories/lights are off, including foot off the brake. 12v on 6v bulbs/accessories - not good.
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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.