You mean locate the 115AC plug on the back of the fridge and unplug it? I hadn't thought of that but sure worth a try. The only things that are AC in the TT that I know of are Fridge (2-way), water heater (2-way), A/C (30A), TV (plugged in but not turned on), and the converter which charges the batteries and provides 12VDC. Thanks for the suggestion!
I forgot to mention that this is connected using the TT 25' 30A cable to 15A adapter to 50' 16ga extension cord. I assumed it was the extension cord even though it's been used for both this TT and the TC I had for a few years so I tried with a heavy duty 50' 12ga with the same result.