Last wire is the one that turns the light on on the dash if its not charging Travis.
I tried running that green sensing wire right to the battery (same as the relay kit does in the boiling battery bulleton) and no change there.
That trailer plug is gone, right now I have 12ga wires connected to the existing alternator wires (cut high enough up to get rid of any melted wires) with crimp and shrink connectors.
I have an alternator in unknown condition from a 322 I parted out, it turns over fine, I could throw it on and measure AC if that looks good I could hook it up to the regulator and give it a shot.
PS I considered seeing if a mini alternator would work when I found out the JD regualtor was 236 flippin bucks. But wanted to keep it original and didnt, but thats still an option once I expire all others.