Make sure the source you are using does not have a tripped breaker OR try another source, you want to eliminate that as a possible problem.
Next go around the RV and make sure you do not have a tripped GFI, these will be outlets with a test and reset button on them, they like to stick them in the bathroom or galley but can be just about anywhere else including the outside.
The AC power should come right from the supply to the breaker panel. SO if you only have some AC voltage could be a loose connection inside that breaker panel, there is no reason all the other AC items would not be working. Having some AC power tells me it is a tripped GFI or bad connection at the breaker panel.
Make sure you also check outside for any tripped GFI's....
IF you can still can not find the issue the last thing I would try is a polarity checker, this will plug into the outlets and tell you if there is a wiring issue, most places like home depot have them for a few dollar, if it picks up a fault then it could be the supply or cord.
Hope this helps some..... Robert