I believe that one of the wires coming out of the R/R powers a latche headlight switch/ relay. You will need to fake that wire out somehow.
It is the yellow (not striped, pure yellow) wire running into the junction box that triggers the headlight. This wire is driven by one of the legs of the stator, that is split off in the wiring harness behind the scenes.
You need to splice that to a leg of the stator. I have an install post I made here
detailing my install.
1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Rebuilt Forks w/ Progressive Springs
VN750.com Grill Cover
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R
1990 Kawasaki Vulcan 750
1998 Honda VFR800 FI
2014 Honda VFR800F
1989 Pontiac Firebird Formula 350
Last edited by thtanner; 06-25-2012 at 04:07 PM.