I have had my camper for 4 years now and have never had a problem. However we were just camping and when we were hooking up to leave and pushed the button to lower the jack the fuse blew. We replaced the fuse and it happened within 2 seconds of hitting the lowering button. Replaced with last of fuses we had and did exact same thing. So we had to use the manual crank to get it down and also then when we got home same thing and had to crank up with the manual tool.
Any ideas what could be causing this? It has never happened before.