AC Power Adapter in Bed not working

[scott64PW]

I've got a 2021 Power Wagon with an AC adapter in the Bed. I'm not getting any AC power at the adapter. There is a button in the cab to the lower left of the steering wheel to activate the AC power there. When I push the button it blinks a few times then goes out. Any ideas how to get power to this bed adapter? I checked the 50A fuse(#4) for the AC inverter in the fuse box and it appears fine. Is there another fuse for this particular switch?

 

[scott64PW]

It turned out to be a disconnected harness under the truck. When it works properly, the button below the steering wheel shows a solid light. Also, tab AC tester on that port showed an open ground, but another RAM driver confirmed that's what theirs does too, so it appears that's normal. I assume it's due to the automobile AC inverter and lack of real ground.