Internally regulated alternator help

[Maladd]

I have installed a new 12 si internally regulated alternator on my 1963 C10 with dash charge light. The alternator is not charging the battery and the charge light stays on while the truck is running. I currently have it wired as follows.

I have the brown wire (to ignition/light) from the cab hooked to pin 1 (the pin furthest from the engine block w/ driver side mounting).

I have a hot wire from the distribution block wired to pin 2.

I have a hot wire from the distribution block wired to pin on the back of the alternator.

I am showing ~12v across the battery terminals with truck running, or not running. Does not change even at higher revs.

My charge light is off with the key off. On with key on and when running.

Am I missing something here, or should it be working?

Thanks,
Jeff