I know this is kind of late but I'm new on the board.

Regulators and generators should be "Flashed" or "Polarized" together, this will prevent the problem shown here.

I have a bunch of vehicles with generators and always do this after doing any electrical work or even after they have been sitting a long time. It only takes two seconds.


'31 Chevy 1 1/2 ton,
'42 GMC 2 1/2 ton 6x4,
'52 GMC 2 1/2 ton 6x6,
'53 GMC 5 ton