Everything electrical in your truck has a switch.(or two). 99.99% of the switches control the power to something. Since the whole chassis and body is the ground path. So every switch is a "breaker", inline on the power wire. So basically: power wire in on one terminal of a switch and power wire out on the other terminal of a switch. I can only think of two things where the ground is switched. Horn and maybe dome.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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