When you reduce down to 6 volts, reduce the entire heater circuit including the original switch and the tri-lead resistor on the back. Thats all there is to it. Now everything works as it did in 6 volts and the only thing that gets crazy hot is that 12-6v reducer.
Or do this:
http://devestechnet.com/Home/HeaterRestore12v motor will run you about $50 and then for your original switch, get 2 one ohm 10 watt resistors and replace the one on the back of the switch. Might run about $55 total plus shipping. I have the two resistors but havent gotten around to updating the page yet. There are a few things I want to test before putting it out there as far as placement, wiring, etc.
