fuse

Hi, I have just bought a 2008 coachman Amara. The owner showed it all working. The hot water was very hot. When I got it home when putting on the water heater the fuse keep tripping. I assumed I forgot to fill the tank before checking the water heater switch was off in my excitement to check...

Conqueror swift caravan just out of warranty fuse keeps blowing, which operates the spot lights, cooker ignition and toilet flush. Any suggestions?