Wanted a way to help the dog cool off while were out at the farm and after hunts. I'm sure it's been done before but I wired a radiator fan to the always hot 7-pin 5th wheel outlet in the bed of the truck. Put a voltage regulator inline to control the speed. Thing puts out some serious air when cranked all the way up. Only draws around 5 amps max so it should be fine to run for a few hours off the dual battery setup in the truck. Put amazon links below in case anyone else wants to do something similar.

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https://www.amazon.com/dp/B007CYB1N2...KP8VQ853HX6QTE
https://www.amazon.com/dp/B07L9HQ25S...FXEBX2M79XX2X1
https://www.amazon.com/dp/B07WR4KBMF...7SASJFK96MGFJF
https://www.amazon.com/dp/B07D3NJTXC...9QPAT17CYNNP5H