Mark, the point I am making is that I believe their is no relation to the bulb and motor "run on". The "run on" is cause by not isolating the coil power from the alternator exciter power.
Your last test with ballast resistor and all that does not match the earlier test when you "shunt" bypassed the bulb and motor stopped as normal. This was done with a isolated ACC power supplied to alternator. In that same post you also confirmed that the alternator will charge without a exciter....with RPM increase.
You got me thinking and I have explained how to eliminate run on by isolating the exciter wire by using the ignition switch ACC terminal for the exciter wire. This is due to one of your experiments. Then you confused by saying you do need a bulb in subsequent posts.
If I read all that correctly. Please read your post and tell me if I'm correct.
Commentary:
I hope we can finally get this issue solved. Diodes, resistors, bulbs, run on..........exciter wire. It seems real easy.
The bulb was never meant to provide anti-run on resistance. It was used as an indicator. The myth has been perpetuated for 40 years.
ISOLATE THE WIRES FROM EACH OTHER!
