Clean the battery ground cable at both ends, with particular care to the chassis end. Pull the upper steering column cover and inspect the harness going to the key switch. The harness is often strapped down a little short and the connector can work off the key switch. Look for heat damage on the battery and accessory terminals of the key switch. Look for looseness in the key switch parts where the contact plate is crimped to the switch body. If there is any question at all, replace the switch, it's (relatively) cheap. The 4WD indicator lamp is controlled by a pressure switch in the 4WD clutch supply tube. Find the switch near the bottom left of the rear axle housing and jumper the wires to check the circuit. The switch has two wires in individual spade comnnectors, not a weatherpack plug. If the lamp lights, replace the pressure switch. Check the entire electrical system for a draw after shutdown. Disconnect the alternator if a significant draw is found and check again. A bad diode set in the alternator will suck the life out of a battery when the tractor is parked, but charge normally when running.
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