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  1. catfive

    how do I wire a fan so that it only turns on when the alternator is on

    I have an application where I hook a DC fan up inside the body of a delivery style truck. Normally, I hook the fan relay to a "ignition hot" circuit, where the relay closes only when the ignition key is turned to make sure that the fan doesn't kill the battery. For various reasons, that isn't...

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