Here's what I did: I ran the Carlon tubing through the side of the compartment and all the way to an existing hole into the false floor behind the breaker box. I ran the Romex into the breaker box and clamped it directly. I don't see that as a big deal.
Wiring the ATS was no big deal. I pulled the three smaller Romex wires out of it. The two #12's I tied together for the second air conditioner. The third one is the #10 that was the original feed from shore power. They sure went to a lot of trouble to save a couple of bucks by not wiring it for 50 amps.
I spent a couple of hours thinking about the EMS and ATS before I actually started work. (By the way, 103 degree heat is probably not the best time to work outside.) Even though you told me that you didn't make changes to the way it was wired, I studied the manual. Here's how the system knows what's going on:
There are two terminals for sensing AC voltage and one for 12 volts DC. When there is 240 volts across the terminals, the EMS assumes that it is connected to 50 amps and shuts the display off.
When there is 120 volts across the two terminals and no voltage on the 12-volt terminal, EMS assumes that it is connected to 30 or 20 amps, you have to select. It then manages the loads based on the selection.
When there is 120 volts across the 2 terminals and there is voltage on the 12-volt terminal, the EMS assumes that the generator is running. It shows the current draw on the display, but doesn't manage the load.
It was originally wired with both AC terminals jumpered together. This means that it would only sense 120 volts (generator on or off). I removed the jumper and wired a circuit from the other leg to the other terminal.
When I connected the 50-amp circuit, the EMS correctly sensed it and shut the display off. When I started the generator, it correctly sensed that it was running and turned the display on showing the load. I turned enough on to pull 35 amps, which it did without a problem.
I was going to test for 30 amps by connecting a 50 amp to 30 amp adapter to a 30 amp to 50 amp adapater, but I haven't found the latter one since I got the new coach. I'll find it (or get a new one) and test that, too.
I haven't mount the box for the new electric outlet and the AC wires, yet. Also, I found a 20-30-30-20 Murray quad circuit breaker that fit the box. I works for the moment, until I get the new one. Thanks for the part number.
I appreciate everyone's help getting this done. Your advice was invaluable. By the way, I have about 80 feet of Carlon tubing left over, if anyone needs some. It was cheaper to buy the whole roll instead of by the foot.