It sounds like you are having the same issues I am having. At times the tractor (jd 1020 diesel) would start, other times very low cranking speed, the tractor would almost fire right up but the starter would kick out of gear. I have put in a new battery, new solenoid, new wires and connections going to the key switch to solenoid and to alt, new key switch, pulled the starter off (tractor has a loader on it and what a PITA that was) cleaned up the starter, no burnt wires, a lot of life left on the brushes, no sign of wear on the teeth on the gear drive, put grease on the teeth and on the shaft. Still the same issue. One thing I have noticed is that I have a small current draw on the battery when the tractor is shut off and I can not find it. Where is the best place for the battery to be grounded to?
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