A quick note: The order that Jesse suggests for connecting and turning the AC on is actually quite important (as well as the reverse when disconnecting). Plugging or unplugging the AC cord into either the pedestal or boat when "live" creates an arc that over time causes increased resistance and heat at the connector. Mainesail has some great pictures of what can happen to the plug when it gets too hot (https://marinehowto.com/hall-of-fail/).just plug into shore power, turn on the pedestal side then turn on the boat side.
Jesse
Another good possibility is that the volt meter is broken. Ours was (Hull 31, 2000 year). But I agree that the batteries are suspect, especially if the reefer only runs on Both.Interesting. Your voltmeter is reading 0v. It appears that the selector switch for the voltmeter is on "Batt 2". You could try selecting Batt 1 and see what the reading is. In any case, it appears you might have at least one bad battery. Time to get someone on board with a voltage meter and hydrometer to check out the batteries.
Another thing to note, it appears your bilge pump circuit breaker might be in the "off" position. It's a good idea to verify it is in the middle, or "Auto" position whenever the boat is in the water.