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Where are you hooking up the battery charger? To the motor directly? Do you have or can you get a small digital multimeter? About $20 or so at most hardware stores and easy to use. I can direct you in some testing. And if you know the brand of your slide hardware that would help here. And if this is a hydraulic system or not?
How did you test for power to the switch? With a small multimeter or a 12 vDC test light? I take it that this is an all electric slideout here?
There may be a module in there, depending on whose slide hardware you have. On older units it can be hard to tell without looking at the motor. What is the name on yours? That would help. Power Gear uses a control module and that may be bad or have a blown fuse IF that is what your unit has. RBW didn't use a module. Neither did early Lippert units. Once we know whose hardware you have we can narrow this down.
Hopefully, you got this resolved as I didn't hear back from you. You can always return to this posting again if you Bookmark it and we can do a follow up. All part of our service and please take time to enter a rating as that is the only way I get credit for my time spent helping you. Thanks! Be safe........