I have an outlet (GFCI) that doesn't seem to have a breaker on it. Whenever it blows, it blows the fuse for the entire trailer and I have to go out to the electrical box and replace the fuse. I have been running a heater on that outlet and it was fine for a month or two, and then I charged my computer on the same outlet and the outlet shorted out and blew the fuse for the trailer. I replaced the fuse and power turned back on. Then I ran the heater for about 12 hours and then turned it up slightly and the fuse blew again (without plugging the computer in too). I had been running the heater on that level for months and now it just keeps blowing just after this one thing happend. Any ideas what the problem is?