Electrical issues are not my strong suit. I had my house battery alternator off for a rebuild. I took my Maramu out for a day sail and upon return to the harbor, my house power failed -everything, not even a dome light will come on. Battery monitor showed 95% charge so the batteries were not spent. In the engine compartment I discovered that a cable from the alternator had grounded to the mounting bracket which is bolted to the engine mounts. I hope I have just blown a main fuse somewhere but I don't know where to begin my search. Any ideas?