Got a mission to fix up a rover. I used EVA construction mode to attach two batteries and four solar panel. The rover comes with a relay and a probe core. After it failed to move for unknown reason, I attach a command seat from another rover to it, still no dice.
The following screenshot shows there are power, the wheel is responsive, but for whatever reason, the wheel is not "spinning".
I somehow managed to get it to move once by reattaching all four wheels in EVA mode, but it doesn't work in my second attempt.