The absolute first thing to do is check all of your wiring. Check for loose grounds, the bullet connectors for the stator, etc.
The second thing to do is get a multimeter and do your voltage checks, as well as resistance tests (slim has a sticky in Eletrical on this I believe). This will tell you 100% if there is a problem with the components.
A third question to ask is are you using the stock regulator? If so, have you relocated it? It can get hot and cause charging issues mid-ride at the stock location. See threads on R/R relocation.
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