There are all sorts of minor (higher resistance) shorts that might drain a battery other then leaving lights or ignition on. One common cause is where a wire has bad insulation and the worn spot is touching steel, so take a good look for such things.
Now, if when the tractor is shut off the ammeter swings over to a high discharge that will drain a battery very quickly. Such may be caused by a sticking cutout relay. If that happens the generator will get hot and in fact if you loosened the belt it would spin and the battery discharges very quickly if that happens. When you turn the tractor off the GEN/ARM terminal (one that wires to gennys ARM post, NOT up to ammeter) on a Cutout Relay or a Voltage Regulator should read 0 volts to frame ground, if it stays hot after shut down, the cutout relay is sticking closed.
Of course, a battery can be bad and discharge on its own even if the tractor and all else is fine.
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