The diode, light, or resistor in line from #1 pin to the on/off switch is to prevent engine from continuing to run when switch is turned off.
They have no effect in preventing battery discharge when the switch is turned off.
Check to see that the wire from the #1 pin goes to the switched (coil side) of the ignition switch. If it is on the always hot side it will keep the alternator turned on when engine is off and cause battery drain. #2 pin can connect to alternator output or other hot battery connection.
If switch is wired correct, suspect a shorted diode or other problem in the alternator. Take to a parts house and have it checked.
To change from Ammeter to volt meter, connect wires from both sides of the ammeter together. Install the volt meter, connect ground post of meter to tractor frame and positive side of volt meter to output of the ignition switch
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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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