I just bought a Motobecane 1970. Lights+stop light+horn
everything work well.
As the bearings in the engine were vry noisy and quite dead I
installed a new similar engine. Now everything work well including the horn but front+back+stop lights dont work.
I dont know if the engine is prior 1978 (6v) or after.
May be the new engine is after 1978 then voltage should be 12v.
If I disconnect or not the zener diode (except the ground still connected) these light dont work.
Thank you in advance if somebody could help me.