As to your current drain when "off", check the voltage at terminals 1 and 2 with the engine stopped and ignition "off".
There should be NO voltage at terminal "1", terminal "2" typically will have battery voltage.
If there IS voltage on #1, pull the connector and check for voltage in the "harness side" #1 terminal.
If voltage is present there, the wiring is wrong, and you need to trace the wire and figure out what it's connected to and move it to a source that powers off when the ignition is switched "off", also to prevent engine run-on and protect the alternator there SHOULD be a resistor, diode, or lamp in that circuit.
One thing that I have seen many times... the system may have worked originally, but at some point the wires to terminal "1" and "2" get switched around.
Does yours have a connector body/plug that will only plug in one way, or two individual wires?
Even with a plug, it's possible that it's been replaced do to damage and/or someone has put the wires in the wrong cavities.
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Today's Featured Article - Massey Ferguson 35 (and up) Tractor Assembly Notes - by Jack Wetmore. These assembly notes are for Massey Ferguson tractors with a two stage clutch and 6 speed, 8 speed and mutli-power transmissions. I see a lot of discussion forum messages regarding damaged clutches from improper assembly. The objective is to have the engine and transmission slide together safely and easily until the gap between the two halves is less than 1/4", BEFORE tightening any of the bolts holding the two together. Using bolts to draw the two halves together will damage the PTO
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