Quote:
Originally Posted by 428street
I know enough about electricity to know black is universal for ground...
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Absolutely not true. In your house wiring, for example, your black wire will be "hot," your white wire will be your neutral return, and your green wire (when you have one) will be the ground. You can not rely on the color of the wire to tell you what it's for. That black wire may very well be the 12v positive connection.