When I did this (with Electrex reg/rect) on the Futura (Falco not that different, except Fut alternator has slightly higher output?), I simply cut out the brown & white connectors, soldered the wires together, & covered the joins with heat-shrink. Been fine for the last 2 years.
Usual advice for this mod (at least as far as Futs are concerned) is to
either upgrade the reg/rect,
or upgrade the wiring from alternator to battery. But not both - or you'll overcook the battery.
Not claiming any special insight on this issue - I just researched it when I did this mod.
Bound to be more info on AF1, if not on here
