Electrical due to engine change

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.

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