I had alldata years ago for our Aveo. It was basically a scanned copy of some version of the factory service manual. It seemed to be accurate and complete data. Dunno how they get the information now as the FSMs are all no longer published, everything is on line.
The FSM CD that you can get through tech authority has most of the wiring diagrams, but they are buried within the diagnostic code sections. Harder to find but accurate.
The best source of easy to use and accurate technical information is techauthority's on line subscription but at a whopping price. The subscription gets you access to everything FCA built, not limited to the RAM. Its easy to follow and to find interesting stuff. I downloaded many of my RAM's wiring diagrams back when it was in beta and free.