You were right, someone has soldered new leads on. So I'm still in the dark (no pun intended re Mr Lucas). Can anyone identify which correct coloured wires used to be connected to which coils. I'm trying to get out of this as cheap as possible + I like trying to fix things in this disposable world.
It should be possible to work it out, presuming the 6V system is working now.
2 alternator leads go to the rectifier, don't they? and a third one goes to the light switch and is connected to one of the other two, only when the headlight is switched on. So you want the third one connected permanently to the one that the switch connects it to now. Does that make sense?
I don't think you can damage the alternator by getting it wrong (no guarantee, I'm just an internet nonentity).