Definitely a diode won't work. I have no clue if the alternator will let the smoke out of charger. If you want to find out, connect charger to your car and turn car on. If you see smoke, you just got your answer.
If I wanted to isolate charger without seeing it it smokes, i would use a current sensor and a relay to turn the power off to charger when there is current coming out of the generator.
GeneralAire Current Sensing Relays come in 120v or 24v models. It would be simple to use the 120v model and a 120v relay NC contact to power up charger when no current is coming from generator. When sensor detects current in generator wires, it will pull in the relay and turn off charger.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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