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Thread: Added 12v aux sockets

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    Default Added 12v aux sockets

    Baffled! I,ve added two 12v aux sockets over the weekend both running power invertors. I have taken the feed using 2 wires (power+earth) from the original factory 12v socket.From the original socket I am running 2 sat navs, a road angel and a phone charger. For the hassle of unplugging the 1 in boot, 1 in the rear centre console and 1 in the front centre console everynight when I get home,I have added a switch to the earth wire before the original 12v socket. All worked well when tested, but when I got home this evening I flicked the switch and the 2 invertors were still running but with a high pitched squeel (like when they overload)???? The car BTW is a Ford so has a permanent feed, even with the igniton off.
    Could it be a cheap switch? (couple of quid from hellfruads) or is it it possible that it is pulling power from one of my satnavs internal battery?
    I have no idea! Do you?

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    Just a thought, why are you switching the earth? You'll still be putting +12v through your devices plugged in, and chances are one of them is picking up a ground somewhere, completing the circuit, so the switch would be next to useless. Personally I would have switched the +12v supply line. - RoyF.

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    why would you switch the earth ? even when off the item will be powered waiting for anything to complete the circuit. Sounds like when its off the live wire on one of the units could be acting as an earth somehow - a short somewhere. When its on the actual earth must be a better connection and electricity always takes the route of least resistance. Disconnect things one at a time till you find the problem then check the wiring and the connections, any wires bared too far back leaving an exposed live that touches car body or bolted to body ? The whole car body is an earth so somewhere youve got contact.

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