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hi and welcome!!!
To troubleshoot non-working turn-signal:
1. check fuses. Don't just look at them, measure their resistance electronically. Many times a fuse can look just fine, but won't conduct any electricity. Replace fuse if non-conductive.
2. test bulb first. Measure resistance of filament. Or apply power & ground with jumper or test cables. If bulb-lights up, then.
3. find wire-connector on inside of fairing and make sure it's connected.
4. if wire-connector IS connected, then disconnect it. Test for +12v & ground on harness-side connector.
5. if no power at turn-signal light connector, work you way up harness and make sure wire isn't broken. Then test for +12v coming out of turn-signal switch.
One of these tests will pinpoint problem area. No need to go further upstream than signal switch as the other side is working, so input +12v source to switch is OK.
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