As a follow up: In troubleshooting the electrical schematic I found that I had the voltage regulator's capacitor wired with a reverse polarity and it was shorted out and blowing the fuse. I ordered a new cap and I hope it didn't burn out anything in my Ducati VR. While I'm waiting for the new cap to come does anyone know of a simple way to check the VR with a multimeter to see if it is still OK? Rotax seems to have little or nothing in their manuals about troubleshooting this VR.