In our 1989 Regal,(Bert--at least for now), there is a 110 outlet on the dash. Right next to it, is a 12Volt tv outlet with antenna jack.
Plug a little fan into the 110 outlet while hooked up to shore power, fan works. Turn ignition key to 'on' position, fan stops. All other 110 outlets work with ignition key in 'on' position. Coach does not have an inverter.
What could cause the ignition switch to disconnect the 110 to that one outlet?
Tere (but written by Jim)

That 110 outlet runs thru a relay. It runs front TV and drops power when ignition turns on so you can't watch driving down the road. The relay should be near the rear 12 v sub panel.