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I don't know if this helps but on my Z50 clone the yellow (and the white) wires each put out 20 volts AC...which then goes to the transformer/rectifier to come out 13-14 volts DC...so it's possible you have a 6 volt system or it's 12 volt and it's bad. Check the white wire too. The blue with a white stripe wire is for the ignition trigger puck, the green is the ground and the black goes to the other end of the trigger puck (although I've seen those 2 switched.) Also - 12.8 volts should almost be enough to keep it charged, if you ride it enough. Mine is always sitting at 12.3...not running.
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