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post #13 of (permalink) Old 12th October 2006
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You'd almost certainly get away with it, but I still consider it bad practice. Live feeds are all protected by fuses, but earth returns aren't. Unless you are also sourcing the power from the lighter feed (which you aren't) then you really shouldn't use the lighter wiring for earthing. If you were to use something up to the maximum rating of the lighter socket and your additional device took a significant amount of power too, you'd overload the earth return and end up smoking the wiring (or worse.)

Ideally, clamp the ground straight to the bodywork. You can usually find a screw or bolt that'll let you do this somewhere. Failing that, I'd tap it into the earth for one of the tail lights.
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