Sorry to jump straight in asking for help on my first post. [:$]
I've just had a nut and bolt rebuild on my 1969 Vespa 50n, 6v standard electrics. Tonight I put all the bulbs in. The headlight came on and then blew (possibly when I tried the horn, the horn didn't work), the side light, rear light and brake light work (brake light is very dim though when the other lights are on) and the horn will not work while the lights are on but when you turn them off it's fine.
Once the headlight had blow it measured 20v at the headlight terminal and 4.5v at the side light. I ran out of time to go through everything.
It also took ages to start up tonight once all the bulbs are in, when I've been starting it without bulbs it's been 1 or 2 kicks.
Any ideas where's best to start looking tomorrow? [:S]