since you say you have a remote you also have a separate circuit board that has the remote receiver circuitry. this board has fuses on it for the slides and perhaps awning and lights. have you check these fuses? they will be on the receiver board, not in the fuse panel.
also, was the switch you replaced a SPDT momentary contact switch? press up to extend, down to retract. did you replace with a like switch?
2015 cardinal model 3825fl
2015 dodge ram 3500 dually