Trying to stick to ignition for now. Starting the motor needs no charge circuit. He asked about the white wire so I veered off course to answer that in my instruction list.
I also said "Using an ammeter is not recommended by me, and I do not offer instructions for it. No. 3 is what the 1951 6V diagram shows."
A three wire hook up is, as you know, Battery positive post, or starter stud, to alternator battery stud. Alternator blade terminal 1 goes goes to ign thru a bulb (idiot light). Alternator blade terminal 2 goes to alternator battery stud.
"4. White wire (terminal 1 on 10si alternator) goes to a gen light, out gen light to Ignition "ON". or from term 1 straight to ignition "ON". Some folks use a diode inline from term 1 to ignition ON. A diode allows current to travel in one direction only. I use a light bulb, and no diode. The bulb supplies the necessary resistance for the exciter/white wire. It supplies a quick warning of low charge condition."
