Jayco 260BHW No Power w/ Battery, Shore or Vehicle connection.

Assuming you are referring to the tongue jack still working I assume it's an add on and on a separate wire and fuse straight to the battery.  

For the lack of power issue, carefully follow the positive battery wire from the battery post down the tongue until it enters the coach. Many manufacturers put a circuit breaker on that line. It will be a small box somewhere along that wire. I'll bet you have battery voltage on the upstream or battery side of the circuit breaker and nothing on the downstream side.