Cranks but won't start. Unplug ground at field spade on Alternator and it starts?

67Dart273 said

Do you have a multimeter with a 10-20A ammeter scale, and know how to use it? Try unhooking that field circuit, then insert your meter and see what that circuit is drawing, both, with key in "run" and with key in "crank"'

Explain the "unilite power wire?" Where does it get power?

I've heard some pushback on unilite, seems like they might be failure prone.

Click to expand...

If I run jumper from battery to Ign2 at ballast I measure 3.4 amps in field circuit with alternator pulley stationary.

Haven't tracked down the Ign 2 one volt drop. One volt drop at VR Ign 1 key in Run ballast disconnected engine off. 1.5 volt drop between alternator output and battery + engine running. Based on old threads I found these readings all point to a wiring issue, dirty/loose connections restricting current flow. So I need to track down and fix those issues so I can get the voltage drops down to an acceptable level.