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Do you have the right regulator for the engine?
I don't know what the wiring system on your bike consists of but on my Lifan 200 all the lights including turnsignals will work without a battery in the system. Head, tail, brake light work on regulated AC. Turn signals work on regulated DC. The battery is not needed at all except for the electric starter.
I can post a wiring diagram for the Lifan 200 if that would help.
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