<VV> Alternator Question - some realted Corvair

[grant young]

To all electrical wizards..an alternator question.... I put a rebuilt
alternator on the 72 Caddy hearse last year, and recently got the dreaded
no charge red warning light on the dash. Suspecting a defective rebuild, I
took it back under warranty, but it bench tested good on their machine.
LAPS counter man suggested it might be something in the wiring, so I
purchased a new alternator plug and replaced it and the old wires in the
engine compartment. The battery and Accel coil are almost new and good.
BUT, the light remains on....what to check or replace next ???? Yes, the
battery will eventually discharge to where it won't start.
Thanks,
Grant Young