In looking at the schematics, it looks like you have single phase AC coming from the alternator Lighting coil. It shows two wires, but the one is going to ground, so it can not be a voltage carrier. Without seeing the schematics of the 3-wire regulator/rectifier, I don't think that it would properly convert the voltage.
Now if I remember right, you have the pull start model. Why are you thinking of adding a battery? Is it to keep the lights steady as the RPMs drop? If that is the case, I have some battery suggestions for you that can save you some money and are not as prone to die while sitting like a normal battery does.
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2005 Hammerhead 150
170cc BBK, PnP Big valve Head, A12 Cam, Uni Filter, Custom Exhaust, 10G rollers, 1500 Contra Spring, 2000 Clutch Springs
Just added - 2007 Joyner 250 SV - Let the fun begin
4-Dirt Bikes, Baja Bug and enough toys to keep me in the garage and out of trouble.
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