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Circuit with switching MOSFET not working

I have this circuit built (updated to remove short-circuit): I'm experiencing some weird behavior though that I don't understand. 1. When I close the switch, nothing happens. No current flows ...
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3answers
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Question concerning n-MOSFET switching

I am wanting for safety a uC to determine a few environmental checks before a device is allowed to be activated, it is a relatively low voltage (2V) however high current (4A) load (powered by a beefy ...