A friend who is working on a TT has been mystified by the magneto's weak output. Thinking the magnets might have gone weak, today he brought them over for a charge. He brought along the flywheel and the hardware, and as I charged the magnets he laid them out on the flywheel and put in the bolts and screws. After charging each magnet, I used correction fluid to make a white dot on the north pole so we could keep track of the poles. Of course, adjacent magnets should have like poles side by side—two north, two south, two north, etc., like this:
Everybody knows this, except for all of those who don't. These particular magnets were all stamped with the Ford logo. I soon noticed that he was placing all the magnets with the logo up, assuming they all belonged that way, and not paying attention to the poles. So in some places adjacent magnets had like poles together, and in other places there were opposite poles together. I think we may have found the reason for his weak magneto.
So, were you able to go back with your Boy Scout compass and correct them. He'll probably be surprised at the change in strength of his magneto. Good catch Steve.
No compass, just another magnet. That's all you need.
Friends don't let friends drive TT's. Everybody knows THAT !
That's why when I rebuilt the magneto on my spare engine, I asked my mentor (who knows a lot more about Model T's than I do) to help me out. Experience can sure make a job lots easier to get done right the first time.
I have seen one T magneto that appeared to be "Ford factory original" which had one of the magnets flipped.