I know someone on here has experience with this problem so here goes: I have a 2004 Holiday Rambler Ambassador, Cummins 8.3 with 106,000 miles. I was doing some routine maintenance Sunday and discovered that the GFCI for the block heater was tripped. It kept tripping when I plugged in the heater so I assumed the easiest fix was replace the GFCI didn't help. I ran an extension cord to the cord for the block heater and it was also plugged into a GFCI in the garage and after 10 minutes it tripped the breaker. Anyone experience this and should I assume that I have a short in the block heater element or in the cord going to the heater element?
I hope I have given a good description and enough information.
Since I live in south Texas I really don't have to have a block heater but I am one of those people who can't stand to know I have something broke and not fix it just in case.