Jayrod - Besides checking the wiring connections, here's couple more things you can try:
1 - With the engine running at full RPM and the lights on, temporarily ground the F terminal at the generator. If the ammeter now indicates charge it's time to replace the voltage regulator. (Or if your A still has a cutout, replace it with a voltage regulator)
2 - Assuming your A still has the original generator, it's output can be adjusted by changing the position of the 3rd brush inside the generator. Moving the 3rd brush closer to the closest fixed brush increases output. But leave a minimum of 2 commutator bars space between the fixed and the 3rd brushes...
Note - a good generator should be good for 13 - 15 amps or so at full speed.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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