Chopper Wiring Harness, Yamaha XS650 | TC Bros. TC Bros. simplified chopper wiring harness for 1970-1979 Yamaha XS650's with seperate voltage regulator and rectifier. Very simple to use, just hook harness to battery through a switch and plug and play with factory style connectors. No special tools or cutting/splicing of your factory harness required. Chopper Wiring Harnesses | TC Bros TC Bros simplifies wiring your custom ride with Chopper Wiring Harnesses made for Yamaha XS650 motorcycles. Purchase motorcycle parts from TCBros.