1990k100E

Originally they were just what they’re labeled Spared
Typically used for xtra lights etc
But after 30 years...probably gonna hafta to test and trace to see what previous owners might have wired them to/for

 

actually, I think he's talking about the thingy that looks like a CB mount.
My best guess is that at one time they had things that clocked driver hours / miles (a precursor to ELD).

 

I’m guessing one is the power divider and the other is the 5th wheel slide. Flip them and see what happens.

 

@JolliRoger will know. He's old as dirt.......knew Jimmy Hofffa personally

 

Those levers on the top if I remember right are for the axles, either lockers or power divider. I remember there are a place for five of them across the panel to control a lot of different things.

 

Should be 5th wheel lock & power divider. Use to drive a 88 K model, I remember the suspension dump for truck and trailer was down on the dash in toggle switch form….

 

The switch on the left is for your power divider
The switch on the right is your fifth wheel slide