I would take that switch housing apart again and make sure you don't have a pinched or split wire. Do you happen to have an FP3 or tuner with a code reader to check and see if it is throwing any codes? I had something similar happen to me with the brake positioning sensor when I did my handlebars. Slowly backtracked and found a crimped set of wires that I muscled in a little too snugly. Took my time and pieced it back together and have had no probs or codes since.
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'15 FLTRXS - V&H Power Duals w/ Screamin' Eagle Street Cannons - Arlen Ness Big Sucker - BT4180.14 w/Arc Moto 602v2 and Polk MM652 - Le Pera Maverick Daddy Long Legs - Advan Lowers - Freedom Shield 15"