I just pulled the pump cartridge out, put in a new fuse and ran it. Didn't blow the fuse. Put it back in an blew the fuse. Found out that the impeller, for whatever reason was now rubbing the housing. No rocks or anything in the housing. I got a new rubber seal, (pain to find)and it was fine. Although I later replaced the pumps because I wanted a higher GPH.
Proud Father, Sons Served their country