My 2003 trailbalzer keeps blowing the 10 amp ac fuse behind the relay. I have replaced this fuse many times. I also installed a new relay hoping that would fix the problem. The compressor works fine and it blows cold air as long as the compressor is working. I replaced the compressor last year so it's only 10 months old. If it had a short in the wiring it should blow the fuse as soon as I installed it but it doesn't. It will work fine for a while and then it will blow the fuse. I have installed a 30 amp fuse and it will blow it too. I just can't figure it out.......