Thanks for the help guys. It is good to have ideas because right now I am crippled up with a knee replacement, so everything takes longer to do. If I work too much my knee swells and I can't do good PT, so I have to limit my projects unfortunately.
I'll have my wife cycle the slide out while I measure the battery as a load test.
Battery has 4 posts, 2 male standard posts, and two threaded screws. Amazingly clean connectors, no corrosion. It is using the threaded screws for the single +, - lines. Made in 2019.
I think fuses are that stuff is under the bed. I have the manuals, so I can look it up.
My big thing was to see the motor was not fried for the slide out. At least I know where to look now.
I can picture wires not connected, or a fuse, or a bad relay.
Seems like battery is isolated except when driving the slide out. Worst case if I am out camping I can get the slider to work via jumpers and my truck.
Again thanks. Ter
