Reverse won't engage on 2009the Harley Trike.

limited info generic answer ------https://www.manualslib.com/manual/1072255/Lehman-Trikes-Dyna.html

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I would use a test light. Just attach the light to the rev motor wire connector . I assume you use a button to activate the motor?

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one wire on solinoid should light up test light when switch is pressed witch then should power control mod and then shifter motor when switch is reversed it should send power to control mod and shift out of rev i dont have schematic in front of me but should work in same sort of manner try google search 2013 harley trike reverse schematic there is a reset video on you tube as well as a hdforum blog on the reserse system good luck this is vid link http://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&ved=0CDAQtwIwBQ&url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D8LAzdoMe96I&ei=wcUkVNysO4mPyAStzYHIBg&usg=AFQjCNHvOFAidKwM-dPI1ObfCc1yh0m3iw&bvm=bv.76247554,d.b2U