Gee Dave, I've run these in 2 cars for 9 years and never had a problem but it's always a good idea to have good wiring and clean connections at light sockets. Rebuilt alternators are available, though not usually stocked, at a local (I think national) auto parts store. They are rebuilt by some national company and I can get you the part number if you'd like. They are a bit smaller than the Delco models but still put out about 40 amps and look more correct. Oh, and they make the typical alternator whine just to let you know they're working.
John Friese
67 White
67 Red