Matt - The difference running on gas and diesel is the alternator needs a switched source of 12 volt power on the #1 terminal at startup to excite it so it begins to charge. Tapping 12 volts from the coil when the engine is running in gas mode (the only time there is an electrical "signal" available on the MD diesel) accomplishes this quite neatly.
Note one the engine is running in diesel mode, the ignition is killed. But the alternator will continue to charge from the initial excitation.
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However since your MD has a mag, you are left with only options 2, 3 and 4.
For simplicity go with #2. But you gotta remember to push the excite button immediately after each start to flash the alternator. Otherwise after a few starts you will have a dead battery.
For reliability use #3. It's fully automatic and requires no action by the operator. (I have a buddy with a tractor wired up like this - it works great!)
Or go with #4 - but be aware of the possible drawbacks!
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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