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So now with fresh batteries in my boot heaters I've got an odd problem. On not so cold days I like to put the heater on 1 just to keep the chill off. Most times I never notice any sensation of heat but once an a while about halfway down the first run the heater gets so hot I have to shut it off.  I've checked the output of the battery pack and it seems normal. About 1.5V on 1. Do I have a problem with the heating element? Not a lot going on there, just three resistors. Anyone else?