I'm no car expert, but I would lay my left one on the line to say that the auto manufacturers would have though of John Q Public reversing the polarity to boost an auto, and as such, droppped a few diodes and ground lines in. Not to mention the fact that a nice big reversed charge *might* pop the top off a nice battery.
Anyone who is a mechanic care to set the record stright?


Smoker_Man
#080000449 MkII - 36Gb Blue