Hi guys -
I had a similar problem in my Series IIA, and in my case, besides installing a new alternator, I figured out that the alternator warning light in the metal dash was grounded - to the dash - so lit up all the time.
Here's how I figured it out. I unplugged the warning light wire from my alternator. With ignition on, my light was still lit. So I realized it had nothing at all to do with the alternator. The bulb had to be somehow grounded to light up.
Installed a better insulated bulb housing, and now works perfectly - light goes out after start up with a reassuring flicker beforehand.
Maybe a different problem than yours, but you may want to make sure the bulb is not grounded itself, making the alternator wire feed to it useless on account of the bulb already being grounded regardless of the alternator 12v feed wire.
Have a great day!
Because life's too short not to drive one.
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