[Spokes]

No need to tear down the front of the bike to get to the harness. I'm sure it may be a simple fix.

The tail light wires (Blue & White) can be found in the frame cradle where the air filter is mounted.

Remove the left side cover, then the tool tray/air filter support. Remove the air filter.

The blue & White wire will be running up the inside of the cradle. You can pull the wire plugs from the harness (mid bike) and check the wiring all the way back to the tail light.

Before you get too involved, being that you just disturbed the light at the frame, check for cracked wire insulation near at the rear fender/light mount. Also check the ground wire from the socket to the light frame.