Re: GPS and cell phone on a 6 volt system
Gene,
I ran the center tap wire, the positive, to the dash board because my truck is positive ground. I used the wire coming from the outer shell of the power port to the ignition switch. Doing this makes the metal bracket of the power port negative ground, like it would be on a newer negative grounded car. The the center tap is positive, like it would be on a newer negative grounded car.
Like Frank mentions above, the metal dash and the metal power port case are opposite charged and in the right situation there could be a spark generated if they were grounded together.
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