I agree with Bob. You probably have a Delco generator (old technology with brushes and an external, square looking, regulator. There are two wires connected to the generator. A Gen terminal that connects with a #10 wire, and a F (or Field) terminal that connects to the F terminal on the Gen, it is smaller #12 wire. The third wire goes from the Bat terminal on the reg, to the non battery side of the amp gauge, it is #10 The fourth wire goes from the L terminal on the reg to the Light switch power input.
A gen/regulator system will always show a bit of charging 1 to 4 amps when the tractor is running above 1/3 throttle. less engine RPM will show less charge till it stops charging at Idle.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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