The simplest way would be to run a wire from the positive battery post to your toggle switch. Make sure you put a fuse in it. Then run from the toggle switch back out to the fan. Unplug the factory wiring and plug you wire onto the power feed terminal at the fans. To find that, just use a jumper wire from the battery to each prong on the fan until it turns on. Plug your toggle switch to that prong. Hope this helps.
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