There may be some confusion sneaking in here on the battery disconnect idea. There is a coach disconnect switch and relay as stated near the left side of the door. However, I do not see any mention of a disconnect for the chassis battery.
Is there a disconnect for the chassis battery that I am not seeing?
If there is no disconnect on the chassis battery, we can ignore it's operation!
Then there is the thought about the solenoid. I assume we are speaking of the solenoid which connects both coach and chassis batteries together?
I don't feel that solenoid is involved when we move the slide or steps as they are thought to work off the chassis battery. Some doubts on those specific items as they are not part of the drawings for the age group after 2010 and not something I can vouch for without being able to check!!!
My question might involve checking that what we read may not be what was meant and if it is true that OP was saying the steps and slide don't work off the chassis battery when the coach batteries are disconnected, We need to check that a bit further.
It is my experience that the safety items like steps are almost impossible to keep from working, even with both disconnects turned off when the RV has both.
My thinking is that the safety items are left on and we can only cut those "phantom drains" by actually doing something to disconnect them like opening the ground side of the battery, etc.
With the added info that they have a 23J model, we get a slightly different drawing for this section of the 12VDC. both at the mode solenoid and the coach battery disconnect.
Looks different on the two drawings but the same wiring and info!
Unless there is something big that I'm missing involved in the chassis wiring, I see it working like this.
Click this snip for best picture.
[ATTACH]
One of the points where the chassis battery connects to the rest of the RV is on this isolated stud. It is never shown as battery but this is the way they draw it and it has to be that way to let the mode solenoid connect coach and chassis together!
But on that same large stud on the solenoid there is wire KKG which takes power to a buss bar feeding three smaller wires, KA, ER and CCY.
When we look at the wire ID chart here:
https://www.winnebago.com/Files/File...ical_guide.pdf
We find we find the three feeds are to the step power, step kill switch and slide control switch. That tells me the step and slides are worked off the chassis battery until somebody can offer a different setup!
With the engine running, the alternator will be plenty big to move the slide or steps and the coach batteries are not really required, but the mode solenoid should be connecting them in the overall picture when control wire LR get power from the ignition hot connection.
Some testing may be needed to make sure this is what was meant and if it is/ is not working?? I see no chassis battery disconnect or relays that would cause a loss of power to the steps or slide!
Possibly a fuse on those specific items that is blown but unlikely to have both blown to put two items out, so I suspect confusion/ missing info mote likely?