[DutchmenSport]

On the inverter itself, do you see the red read out lit up and a small green light? Or is this dark also? If you see the read out's and the small green light, then the inverter is on and working. If you are wanting or expecting to hear any sound, indicating it's actually running, you won't hear anything running until you unplug from shore power. Then the inverter will kick on and start humming when it senses a load on it and it heats up. Then the fan will kick on, and that's what you'll hear.

Then check your refrigerator while unplugged from shore power and see if the light come on inside.

Try unplugging from shore power, see what happens.