The parts list shows the resistor for the alternator (item key 19). Your picture shows the upper wire going to the #1 (excite) terminal of the alternator. You posted it will run and shut off if the lower wire connection (two wires in it) is unplugged from the resistor. Without a true wiring diagram, I am guessing that connector was used as a junction with one of those two wires bring power from the ignition switch. That would excite the alternator through the resistor and the other wire goes from there to the coil to power the ignition. As has been suggested, I would suspect the resistor is bad or the wrong resistance. Try the old resistor you took off to see if the problem is still there.
Edit: Further looking on Amazon I see the resistors for use with a 6-volt coil when used in a 12-volt system; I don't see the higher resistance one needed to use in the excite circuit of an alternator. Can you post the info on the resistor you purchased?
This post was edited by Jim.ME on 03/22/2023 at 04:36 am.
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