Jerry, an electrical problem is different than a mechanical problem. Seeing shavings is a mechanical problem. The slide drive is a rack & pinion mechanism, just like rack & pinion steering, only not nearly as strong. The pinion gear is steel while the rack gear is aluminum and what the shavings are coming from. Most likely the gear block has failed allowing the pinion gear to jump some teeth on the rack gear. It's a weakness of the Swintec system, among other things. It could be destroying the gear block because the slide itself isn't constructed square enough to be within the movement limits of the slide mechanism. When I had Schwintec slides, it seems they would allow for 3/8" movement in the mechanism before they started to bind up. When all the horror stories began to come out about Swintec slides back about 2015 or so, I got rid of that coach before I had problems. Hard to believe Tiffin has continued to use them.
I have no proof, but back when I was considering all the possibilities of the problems, one thing I came up with was the length of the slides on the ends. By this I mean the distance from track to track on the outside wall (ends) of the slide, next to the outside wall. Then measure the tracks up next to the coach wall. I found my tracks were about 5/8" different up against the coach wall as compared to the outside wall of the slide. This means the Swintec drive system had to compensate for that 5/8" difference from the slide being in, or being out. The slide end walls were not perfectly square with the slide outside wall. If the 3/8" movement in the drive mechanism is correct, the 5/8" difference would just try to pull the drive system apart. That also depends on where the slide was setting when the Swintec frame was screwed onto the coach side walls.
Your other question, the alternator is connected to the batteries, so the motors use a combination of the two power sources if the engine is running. Claiming your mechanical problems are a result of the electrical system is sort of saying we don't know but we are going to replace the broken parts. If one motor quit running and caused a mechanical problem, they would be correcting the electrical problem too.
2019 Fleetwood Discovery LXE 40M w/2021 Equinox