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Get and study the wiring diagram. The more you understand about how it works the easier it will be to find the problem. The only way you can fix an electrical problem without a wiring diagram is to throw parts at it until it works. Redrawing simplified circuit diagrams will sometimes help.
There are some simplified diagrams in the service manual.
There are tests and troubleshooting charts in the service manual.
You need a multimeter to test electrical wiring. Without one your shooting in the dark.
Did you remove your headlight and check the wiring in the headlight bell. There is a big wad of it in there. Power for the whole bike goes through there including one connection that supplies voltage to the ignition system. Use a very bright light and inspect the wiring closely. A pinhole in the insulation in the right place is all it takes.
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