Step 4Mount the Switches and Wiring
Note that the resistor that comes with the blower wiring is normally inside the heater duct, where it's red-hot coils get cooled by the blowing air. It must be located in a place open to air flow, and at least a foot away from combustibles. An good alternative wold be a 20 amp capacity motor control rheostat for the 12-volt blower motor.
It's tempting to use a 120-volt AC motor as the drive motor, but don't do it unless it is a sealed unit. The chance of spilled liquids getting on the motor is too great. 12-volt is generally considered safe as far as shocks go compared to household voltages.
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