G'day guys, I have a 1971 Norton Commando with a gremlin in the 'lektrizity. The owner who gave it to me to sus out the problem could not get it to even light up off the keystart, no istrument lights, headlight ect and would blow fuse after fuse???? Well I did all my circuit tests and traced wire circuits for the whole bike. In the end I found that if I disconected the rectifier and the Zenner diaod Blue/Brown wires the keystart would operate again and the red dashlight would light up, even the headlight would work! So now I know it's one of these two buggers, however if I clip one or the other back on it's spade connecter.....off gose all lights and the fuse gets real hot or blows. So this would make me think it's both the Rectifier & the Zenner Dioad that are stuffed:huh. Has anyone out there seen this before? It's like when I connect one or the other or both up it robs the bike of current from the ignition barrel up to the front half of the bike! at the same time overloading the circuit at the back of the bike (around the battery area). any ideas would be welcome thanks guys.