Hello,

I have a 1970 IIa with AC Delco 63 amp altenator upgrade. It was
working fine till last night. I've been hearing a sound from the firewall
area resembling a intermittent scraping. I believe there is a relay
that regulated charging in there somewhere that has gone bad. I'm
pretty sure it's not the voltage regulator that is screwed to the firewall?

Anyone have a similar problem? Fixes? Ideas?...before I go rplacing parts.

I can run the car of the battery till the charge drops to low..i.e. the battery
is not being charged and the altenator works.

cheers.