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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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