No you do not need to run an extra brown. Read through this thread.
http://www.xs650.com/threads/72xs2-73tx-wiring-diagram.53244/
Also Mailmans thread starting at 2190. Both go into the details of the 72 lighting wiring.
http://www.xs650.com/threads/mailman’s-xs2-a-full-on-restoration.51520/page-110
http://www.xs650.com/threads/72xs2-73tx-wiring-diagram.53244/
Also Mailmans thread starting at 2190. Both go into the details of the 72 lighting wiring.
http://www.xs650.com/threads/mailman’s-xs2-a-full-on-restoration.51520/page-110