Posted by Franz on Sunday, January 20, 2002 at 1:33AM :
In Reply to: 6 volt heater, 12 volt truck posted by cliff on Saturday, January 19, 2002 at 9:17PM :
If you can't find one of the resistors they use for trailer brakes that are 6 volt when towed by a 12 volt truck, you might try inserting a headlight bulb in series with the heater motor. Give it a try and meter the voltage at the heater motor.