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 - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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