The problem 1 was me trying to make it too complicated.
Found the main ground wire for the slide out! The big white wire coming out of the same hole as the 2 wires that run to the slide out motor.
Started checking the main ground wire for the slide out and what do you know it was the terminal connecting it to the battery negative side. No corosion on the batery at all it was in the terminal to wire connection. Replaced the connection and the slide out works fine.
Just so we have it documented here is a description of the slide out circuit.
5 wires total
1 red 1 green 1 black 2 white.
Red and green run to either side of the electric slide motor.
Black is the positive wire
2 white wires are the ground which go to a wire nut connecting to the ground.
The Switch works in this way:
It directs positive to either red pushed one way and ground to the green.
Button pushed the other direction it directs positive to the green wire and ground to the red.
Each direction pushed reverses the flow of electricity through the electric motor moving it in either direction.
Thank you MACK C-85
for taking the time to respond!