I agree with Scotty, thats basically a Ford type of magnetic starter solenoid switch used to replace maybe a push to start original mechanical starter switch. It grounds via its metal mount to the tractors frame
The big cable on the big left post runs down from the batterys + terminal...
The small wire on same terminal likely wires up to the Supply (NOT load side to alternators output) side of an ammeter
The small wire on the lil S terminal wires tp some sort of ignition/start switch that sends hot voltage down to the lil S terminal to engage the starter when you turn it to start or else push some sort of Start button.
The big post on the right has a big cabe to the starter.
QUESTION You mentionEd Ballast Resistor, do you mean it has an in line series ignition ballast resistor wired after the ignition swtich before and ahead of the coil ?? If so its to drop the 12 battery volts down to 6 for a 6 volt coil.....
IFFFFFFF thats indeed what you have I would run a 14 or so gauge wire from that solenoids lil unused I terminal to the high input (from switch NOT to coil) (should be + for Neg ground) coil terminal and that will give you a hotter starting spark. Thats what that extra I solenoid terminal is for
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