I have just purchased a 73 Overlander. The converter was working fine on friday, the lights, radio and Jack were working (when it was plugged in). Went back saturday and the plug-ins and AC would work, but had no lights, jack or radio. When I plug it in I can hear the Hum of the univolt. When hook it to a battery it blows a fuse. Any help will be greatly appreciated. I am planning on taking it out this weekend. Thaks, Bill