Power to one cabinet only delivering 80v?

[TQ60]

Okay breaker is good so turn all but that one off.

Now check every outlet you can find and note which ate hot and what the voltage is.

Follow the wire from breaker and if it is a Romex type wire locate the white wire from it and confirm it is properly attached.

[Gary RVRoamer]

What year Southwind are we talking about? Most of the older ones had no inverter at all, or had an inverter that is dedicated to the TV & entertainment cabinet. While an inverter could be the source of this problem, it is pointless to debate it unless we can be sure there is one involved.

A bad or loose wire connection somewhere between the breaker and the outlet is at last as likely as the cause of low voltage.

[mikaho]

Just an update. After killing all breakers except the one in question and taking hot to neutral, hot to ground, and neutral to ground readings on all outlets, I found that hot to ground was 110v across the board but hot to neutral was low which I took to mean the issue was a neutral connection somewhere in the chain. I also discovered there was an outlet in the bedroom apparently intended for the bedroom tv that turned out to be the first outlet in the chain and that outlet read 110v between hot and both ground and neutral. Disconnecting and reconnecting that outlet fixed the problem! For now everything is good but I now have a near term project to replace all outlets with better ones featuring screw terminals rather than the cheap press in terminals of these existing outlets.

Thanks for all the tips!