If you don't really know how to check out your electrical system, follow the steps here:

charging system

Mine was being a bitch to start and having carried out the checks decided my battery was dead and the reg/rect suspect. Replaced them yesterday and it now starts second kick.
_________________
MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball