No Rear AC on Generator

Went out to exercise the generator. PC has been hooked up to 50amp for several weeks & running the rear AC set to 88 degrees. I first turned all electric off & flipped the 50amp breaker box off. Started the generator & let warm up for several minutes. Set the rear ac thermostat to 74, waited several minutes---nothing. Turned the thermostat off & reset to 76 degrees(inside temp was 89) again---nothing. Turned the rear thermostat off. Turned on the front ac & it started within seconds. Didn't try to run both units at the same time. When finished exercising the generator, turned all electrical off & reset the 50amp breaker box. Turned on the rear thermostat to cool (still set to 76 degrees) the ac started up within seconds. Electrical is my weak point----what am I missing & where to start? Chuck

Nothing I believe.  The generator can only power 1 A/C and only the front one.  Unless you have a special generator, they only put out 30amps.   That's why you have to hook up the 50amp plug to the 50 amp socket on the pedestal at a campground or your home.

50 amp RV plugs have 2 separate hot lines in them. 30 amp only have 1 hot line.  Thus 50 amp plugs have 4 prongs while 30 amp plugs only have 3 lines.  That 2nd line in the 50 amp probably only connects to the back air conditioner.

Don, thanks for your reply. This is the smallest generator that we have had in a rv. I am used to 7000watts plus. Understanding the 1 leg 30amp, 2 leg 50amp difference I was hoping to be able to choose which ac to run. We are learning our way around the PC. Mainly finding where everything is located. Thanks for reminding me of something I had forgotten long ago. At my age forgetting is a daily struggle. Chuck

When we ordered our 2018 PC with 50 AMP, they pointed out that the rear AC would not be powered by the generator OR if we were only connected to a 30 AMP outlet.
Gary