Check you wiring system to make sure you don't have a loose ground somewhere. That will cause all sorts of weird things to happen. It will show as a badd battery, bad rectifier, or just about anything when it is just a loose wire.
On mine I had a switch for the light completely fall apart. I don't know if you have a switch that you can turn the light off or not like my '01, but went to check the switch and it fell apart.
Usually you have to follow the harness the whole way and inspect it. Do the easy stuff first before you get into the stator or electronics. You may have to use a multimeter and test for continuity while wiggling the wires to see if you have a broken wire.
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07 EC 300 
06 Gold Wing 
(2) 06 CRF 150 F
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