My guess is that the 20A receptacle at the pedestal is powered from the 30A circuit breaker for the 30A plug. Probably wired this way to prevent what you are trying to do. JM2C...
May be the case some of the time but not always. I found that, in the case of a campground we frequent often, the 30 amp circuit and the 20 amp circuit come from completely different main breakers. Found this out when we lost power to the 30 amp circuit but were able to use the 20 amp circuit. Since then, we are able to run the front, auxiliary, ac by running a 15 amp extension cord in through a slide out and plug the aux unit in directly. My fifth wheel was prepped for the front ac with a receptacle in the ceiling so I when I added this second unit I just put a male plug on the unit and plug it into the receptacle. Run two units in this campground always when the weather is hot.
2005 F250 Crew Cab LWB Power Stroke, 2007 Montana 3500RL Fifth Wheel,Honda EU3000IS, Twin Honda EU2000i's, S&W security system
OP here. Just want to thank everyone for their thoughts and info. I'm sure with all your help i'll be able to get something going. I'm trying to do this as cheap as i can (read retired) and try to use what i've got as much as possible so i'll have to digest all this info to figure out where to go from here.
thanx again folks
2009 Cedar Creek 34sats
2007 Chev 3500HD D/A
I did it with the rear,, First, I do not have an Energy Mangement system, if I did this would require a modification of the procedure I'm about to outlline.
In my case the breakers are in a "Hall" area, near the floor, Behind the wall is a cabinet that extends all the way to an outside wall, I cut a hole in the outside wall and installed an access "Hatch" there, one of the square electrical hatches.
I then got a 12ga Extension cord that was a bit longer than 2x as long as the distance from said box to the breaker box, and a Junction box.
Disconnected the Rear A/C (Would have been the same job if I'd done the front) from the breaker, box, Pulled all e (White/Black/bare) wires, and routed them to the junction box.
Cut the cord in half, so I now had two pigtails half as long as the original cord.
The plug end of cord was routed thorugh the access box, to the junction box, White to White, black to black, bare to green, wire nuts, solder and tape.
The outlet half went to the original breaker connections.
TO use "As designed" *By the motor home maker) plug cord into it's other half.
To independently power, pull plug and plug into a 12ga extension cord (Sears, K-Mart, Lowes and Home Depot all carry those, I assume Mennards does as well)
To air up service side tires, Unplug A/C and plug compressor into same outlet.
NOTE: A puriest would have pout a 20 amp breaker in that junction box.
Nothin adds excitment like something that is none of your business
Kenwood TS-2000 housed in a 2005 Damon Intruder 377