Converted my 47 to 12 volts a few years ago. Ran my 6 volt heater on 12 volts. Worked ok, just ran very fast. Last winter the switch gave out, you had to wiggle it to get the heater to come on. The original switch was mounted to the front of the heater, not the control panel. Went to Napa, got a universal 12 volt under dash switch. Hooked it up and it worked fine, on high. On anything lower than high the rheostat in the switch would start smoking. Ran the heater today (a little cold in Chicago) for about 15 minutes and the fan started slowing down on its own. Finally quit working. Any thoughts on this. I would really like to get the heater working again.