Have you tried switching the batteries from side to side to see if the problem moves with them (bad new battery)? If both batteries are good, another possibility is moisture and dirt in the starter solenoid, or moisture, dirt and brush carbon in the starter. The solenoid only disconnects the starter from one battery, so the innards remain connected at all times to the other battery, and crud in the starter will definitely drain one of the batteries. I will not speculate on which one, as so many of these tractors have been jerry-rigged from the original wiring configuration. Other possibilites... -Crud or debris in light switch or key switch bleeding off power. -Fuel gauge hooked up wrong so it's always on. -Battery cable or other wire with bad insulation running through moist crud or debris under the platform, or elsewhere. -Bad alternator diode and/or winding shorted to case. (Try unhooking all wires from alternator and taping the up safely, to rule out drain through alternator.) To troubleshoot, with tractor and all loads (lights, etc,) OFF, try unhooking a cable from the battery that goes dead, and hook a low wattage test light in series, between the cable and the battery post it was removed from. If there is a steady current drain, the test light should, at the very least, glow dimly. Unhook components one at a time until the light fully goes out. In this manner you should be able to isolate the source of your electrical "leak". If you get this figured out, post back. It will be interesting to see what you find.
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