well, i jsut replaced my heater fuse, one of the big yellow ones, there are 3 but one is for hte heater, not sure if there the same ur talknig about or one of the smaller ones. i dont have a owners manual so i dont know. my heater one was 60 amps tho, and it took about 6 hours to replace cuz it was a b!tch get the tray out. if that blew, it might be caused by an overload or a "spark" in the altenator, mixed with something else thats on making the fuse blow
