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You need a small digital multimeter for some testing here. Aboout $20 or so at most hardware stores and easy to use. But, first......check the battery disconnect solenoid switch to see if that is on. When you removed the batteries, it went to the "store" position and took the batteries out of the electrical loop. Sometimes it can be just something that simple. If not, get back to me and we can do some easy testing. That solenoid is what "clicks" when you hit the switch. Near the entry door or on the overhead near the door or on the dash. Get back to me if we need to dig deeper into this as all follow ups are included in our fee.
Under the front hood on the driver's side. Black cover over them about 14" square. Take that off and they should be in there. Two of them. One for the coach and one for the chassis. Made by Intellitec most of the time or RV Custom Products. I will make a phone chat offer for you in case we need to do some testing here.
Just checking back in to see if you were able to get this resolved or so you still need some additional input from me here?