Found the problem. Actually two problems. The first one found did not blow fuse, but needed fixing. I thought it was the one that blew fuse and that threw me off track. The rear tire had rubbed through the insulation on several wires, but they were not shorting yet. With that fixed, I found I still had a short. Removed seat, headlight, and tank. Connected 12-V lamp across the blown fuse and it would come on when ignition switch was on. Removed the US headlight jumper to take the lights out of the circuit and the test lamp was still on with switch. I would still have current through the test lamp going to fuel pump, relays, lamps at speedo, etc. that I could not take out of the circuit and I do not know how much current they were drawing but probably enough to light the test bulb. Got new supply of 20-A fuses and tried a new one with the headlight jumper removed. No short, reinstalled the jumper, no short, but the fuse blew when the headlight was reinstalled. It took a lot of looking, but I finally used needlenose pliers to slightly spread the three terminals on the back of the 7-inch tribar headlamp. That gave me power to the lights, but not to the starter. Finally I put it in neutral and all is right with the world. Don't forget neutral. GA-DK