On Nov 30, 2011, at 11:57 PM, Sewell, Steven wrote: > Sounds like the heater is going bad. ... > I've got an engine block heater that trips my ground fault outlet. Any extension cord in use may be at fault, also. I have had both bargain priced romex and an extension cord blow circuit breakers. Roy Roy Morgan k1lky at earthlink.net K1LKY Since 1958 - Keep 'em Glowing!