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Originally Posted by kok328
Yes you can hook the fan motor to a direct 12V source and ground it to the battery or the chassis. I had to do this last winter while I gained enough knowledge to realize that my control panel was shot. I fused it and ran a toggle switch to the inside to run the blower. I didn't get fancy with any multi-position switches or resistors so it was pretty much all or nothing on the fan speed.
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If you do this, you will need to use a switch with a relay to energize the (fused) hot wire to the blower motor, otherwise you will risk melting the wire. The blower motor pulls about 18-20 amps on high speed!
