Sorry have exact same issue. Yes the light comes on when key is on position and stays on now that car is running. Putting out 12.5 volts but I'm getting a discharged battery. Looks like a conversion alternator 2 prong.

 

Sounds to me that you have a bad regulator, should be putting out 14.5ish volts.

 

unfortunately the regulator has been bypassed. I've noticed it dim a few times but it's never stayed on. Checking everything out today even tho it's 105 out

 

What does that even mean? The car must have a voltage regulator to charge properly. If the original external regulator has been "bypassed", that usually means the car was converted to a 12SI alternator with internal regulator. How about some photos so we can stop guessing and provide you with useful information.

 

I moved your post to its own thread.

 

Yes it's been converted, I installed ac from vintage air years ago and went ahead and converted it over since It came with a 12si alternator. Anyways it's only putting our 11 volts at idle and under load so I'm hoping it's just bad alternator. 2nd one in 2 years. Really regretting getting rid of that external regulator now. If it ain't broke don't fix it. Fml. Posting pics now. Not wanting to upload have to walk inside

 

Where?

 

Your in it...

 

lmao you da man.! Swear i looked before asking, was showing old thread. Thanks..