As Davenseattle states above a good battery is a necessity! How old is your battery and what is the condition? If suspect, change battery and as Rick says a new RS rectifier (a cheap but easy install), then finally trace the wires out and fix any that need it. Realistically the wiring harness, while old, is not all that complicated. Get some dialectic grease and steel wool to improve the connections. Good luck.

Glenn

1974 CT90 K5
2012 Honda Silver Wing
2005 Honda Gold Wing 30th Anniversary Edition

American Legion Riders Post 12
 Wickenburg, AZ

BZMF #091, English Chapter

" Keep brotherhood till die "