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Remove the tail light lens. Inside you will see where the turn signals plug into the wire harness. Unplug the connector, make sure its clean inside. Reconnect and try the signals.
Both the foregoing suggestions are real good. Yup, take ithe lens off by undoing the 2 phillips head screws and removing the lens (cover). After checking stuff out, when you put the lens back on don't be real ambitious about tightening the screws back up or you'll be in the marked for a new plastic lens.
Had a similar prob with my 07. Turned out the wires under the rear fender were worn through the insulation and wireing right below the retaining clip. Take a look with a flashlight and see if you have a similar prob.
If you can't figure all this out take the bike to the stealership - enjoy.
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