1. It doens' matter 'which' pole you use, so long as it's consistant. That is, if your grounds are all 'negative' then that's what you'll use. If your ground is the positive pole, than all '12v+' sources will need to be the opposite of normal. A battery doesn't know/nor care what side is which, as long as it's the same.
2. Your car is 12v, not 6v.
Switch it back, and be happy.
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