Modifying my scooter for charging a battery?
I have a Scooter and now i have added a battery within it. I charge the battery externally, but lately i have seen that the lights that i keep on in the night (halogens lights) tend to fade away after 30 min or so and gone. Now i want to charge the battery while on the move. I tried doing so through the coils that were in the scooter by adding a rectifier circuit it works but the head light goes dim, and this idea didn't work out for me.
But now i am planning to buy an external alternator and modify my scooter to charge the battery. Is it possible and if so what is the type of alternator i should use and the Amp ratings.
My battery is a lead Acid Battery.
Thanks in advance