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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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