power source for choke

That IS a later alternator, but that terminal does you no good.

On 69/ earlier alternators, the field is fed juice FROM the regulator, to ground through the field

On 70/ later alternators, the fied is fed juice from the ignition bus, and the regulator controls the ground on the second field.
I was hopeing you would find this thread. Mr, I commend you, I`ve noticed you helping on a lot, if not all, electrical/ignition, problem threads. And their`s a whole bunch of em.
I`m going to get the relay as posted.
My original problem was a intermittant no start problem, would happen maybe once/twice a year, now it`s more frequent. But thanks to this forum and other problem posts, I realised, I Fff up big time a decade ago, powering my choke/tac/radio off ignition on back of switch. Couple days ago I disconnected all these wires, and she been barking to life every time now, 'knock on wood", thus the new fear of robbing any power off ignition circut. I always felt it had weak spark, and the MP conversion instructions, states strongly it MUST have a full 12v. Hopefully once all this is done I can relax and not worry about if I turn the key off it will start and get me home :prayer:
Thanks:!: