And the final story.
Turns out the alternator (which in my Frankenstein Alfa came from a Milano) had a cascading series of problems. #1 was that a wire on one of the brushes was intermittently connecting, leading to all sorts of odd electrical issues. A voltage gauge in the car would have revealed what was going on. But that was why the dash red light initially wouldn't come on - there was no ground path from ignition through the alternator when the brush was in broken condition. At the first trip to the shop it has wiggled back to working and the light worked and the alternator made power. Then the wire came completely undone, and the slip ring went bad, and thereafter the regulator, all in the span of the the Monterrey weekend. I made it almost home on battery power (a 50 mile tow to get the rest of the way)
While the alternator was at the shop, I tore into the dash, using electronic cleaner and wire brushes on all the terminals, cleaned the body/ground connections, and physically cut off the spade connectors on all the ground wires in the dash, soldered and shrink tubed all new connectors. Every thing now works MUCH better and brighter.
1958 Touring Spider in restoration
1963 Giulia Spider "slightly" abnormale
1967 Giulia Sprint GT (aka Stepnose) with 3.0 V6 and a/c
Now full time in Magalia CA.
Last edited by Neil Martin; 09-02-2018 at 08:59 AM.