Dart 273; thanks for the video. I did a little snooping and found out there were two systems. One had dry cell batteries, the other had V shaped magnets on the flywheel and acted like a magneto. This was the first multiple spark discharge system?
Note the two piece spark plugs. You would take them apart to clean them.
My understanding is that the T started on battery and then a switch transferred the coils to the flywheel magneto. The coils were "timed" by breakers in the flywheel
I once rode in a CANADIAN built T here in town. I was looking at it and the owner INSISTED I go for a ride. I did not resist!!! It had "Canada" embossed on the head and the running boards. He had installed some sort of overdrive, and also a new accessory cover on the engine which provided mountings for a conventional distributor and a drive for a generator. He had converted it to 12V and an alternator!!! This was a ?? roadster pickup with a very very short "bed." Not sure if it was "factory" as there were many aftermarket bodies avail. back then, including "speedster" bodies.