Dead Gen 1

[pete]

run a multi meter across the battery
take note of what its reading
should be just over 12 volts

start the bike and whist cranking take note of the voltage
from memory it shouldn't drop any more than a volt if any,
any more than 2 volts u have a faulty battery. (one of the cells is breaking down)

now that's its running rev it to
around 2500 - 3000 rpm u should be getting
at least 14 volts if it isn't charging itll still be around
the 12 volt reading or lower if the lights are running, (possibly stator problems)
if it reads any higher than 15 volts u have a faulty reg/rec.

let us know how u go.