Magneto Recharge Update

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Model T Ford Forum: Forum 2015: Magneto Recharge Update
Top of pagePrevious messageNext messageBottom of page Link to this message  By Robert Skingley ......Westland, Michigan on Monday, July 06, 2015 - 03:38 pm:

It was not a perfect test, but we now have 10 VAC at low idle and 25 + at high speed. The voltage before we started was 3.8 at low idle measured from the coil box wire. We started by removing floor boards and removing the band cover off the hogs head. We aligned the brass screws that hold the magnets on the flywheel parallel with the ground and also used the compass to give us a north reading. I thought the north reading gives us a repeat place to start on a retry. Two things make this not a perfect test. The mag wire was not real tight......it had the wrong nut.......1/4-20..it needed a 12/24. The mag post was in good shape with a strong spring, giving contact, but........when removed there was a slug of Kevlar seaweed that had accumulated. We had drained the oil and proceeded with the Arc welder recharge or re-alignment. As you can see it was not a clean test in conditions but it worked when we were done. Here is the procedure as suggested that we followed, we set the arc welder at DC+ 150 amps.


Magneto Recharge:

I don't understand all of that east-west compass stuff. The mag is dead. What little magnetism that is left is immaterial. Here is how I have been charging mags in the car for years with pretty much a 100% success rate.

1. Pull the transmission band door off so you can see the flywheel.
2. Turn the motor over until any two off the brass screws are in a line that is parallel to the ground. In other words the two screws are evenly spaced.
3. Remove the mag plug.
4. Procure a strong DC voltage source of 36 or more volts. Several batteries or a DC arc welder work well.
5. Put some tape around a punch or bolt or some such thing and hold it onto the mag terminal through the mag plug hole. The tape is to keep the bolt from shorting to the hogshead hole.
6. Make a connection to the bolt from terminal of the power source.
7. With the other terminal of the power source, flash the chassis several times. I do eight flashes, just out of habit.
8. Reassemble and test.

If it doesn't take on the first try for some reason (usually operator error) retry.

Be very careful, especially on 26-7 T's to not short the terminal to anything, especially the gas tank. It is quite possible for an errant terminal to short onto the gas tank and pierce it and cause a fire. Also take any other precautions that one would need to take with sparks flying about.




For those who have not installed Magnets they have 8 charged one way and 8 the other ................this allows you to put two N together and two S poles.

NN SS NN SS etc


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