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Re: Strange turn signal issue on 72 C-10
There is a small screw that goes through the printed circuit on the back of your gauge cluster. This is the primary ground for all your dash lights including your turn signal lights. This screw contacts your ground loop in your printed circuit and the back of your instrument panel. If this is not making a good ground at this screw it will do what you describe. Yes just a small 1/4" screw can do all of this. It allows power to back feed through your harness and cause kaos
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