Squareback vs round back alternator?

Dana67Dart said
Looks like you are on your way.

Just a point.

One side of the ballast resister should go to the coil. The other side should go to ign 1 and the ign1 side should have battery voltage ( 12 to 15v) with the key in the run position

The coil side should have much less like 5 to 8v depending on the rpm.

The ign2 wire should have approximately 8 to 12 v ONLY while cranking (key in the start position).

The ign2 wire should be attached to the same side of the ballast resister that the coil is attached to.

I assume you seperated the ign1 and ign 2 wire behind the key switch.

Thanks, yes, it's going there slowly but steady.

Yes, I separated the ign1 and ign2 wires. Correct, right?

The way you explained the contact assignment on the ballast resistor is exactly the way the WS manual shows and I did it that way.
1. upper contact: coil + and IGN2
2. lower contact: IGN 1 and IGN from Vreg

Voltages measured

upper contact (coil + and IGN 2)
Engine off, key in RUN pos.: 7,5 Volts (!)
Engine cranking: 10 Volts
Engine idles and higher rotations: up to 13,8 Volts

lower contact (IGN 1 and IGN from Vreg)
engine off, key in RUN pos.: 12 Volts and dropping slowly
Engine idles and higher rotations: up to 14,4 Volts

Should I try a ballast with a higher resistance or do I miss something in that puzzle?