my understanding was that if it was a generator fault the bike would not idle, it would start up and quickly die. i had to leave it running for 10 minutes at halfords when i bought the battery and charger so i think it would have died in that time if it was only running off the battery.
im not sure how to go about problem solving the reg/rec...
in other news my list of jobs has been finalised to:
paint front calipers gold with black TOKICO detailing
paint torsion bar silver (currently its coloured corrosion/embedded dirt

)
coil stick mod
buy, fit and paint aluminum frame stay and aluminum meter stay
maybe integrated indicators in my wingmirrors?
still think i need a new master cylinder (although its fine at the moment, if i want to pull stoppies i probably could, i can raise the rear off the ground under braking which never happened before)
my levers are all marked (previous owners damage) so a change (in line with the MC)
new bar ends and grips
replace a few bolts with black aluminum (fairings, fuel cap, screen)
new rearsets and matching pillion pegs
powdercoat F+R rims
would like a new brake fluid reservoir for the front
finish polishing frame...
EDIT:looks like if the REG/REC has gone then the system will not be able to REGulate or RECtify the voltage, i have bought a multimeter, when it arrives i will look for voltage spiking up to 16+ volts, as well as looking for low voltages, all under load.