If your motorcycle lacks a fuse box, you can connect the yellow cable to the tail light wiring harness instead. The tail light wiring is typically located inside the rear fender, under the seat, or near the tail light assembly.

To access the tail light wiring:

1. Remove the seat and rear fender panels to expose the area around the tail light.

2. Remove the tail light housing cover.

3. Use a multimeter to test the wires and identify which one has power running to the tail light - this is the wire to connect the yellow cable to.