What does this knob do?

[GomezTheM35A2C]

I have a 1973 M35A2

What in the world does this knob do? It's right above the transfer case shifter.
It reads "Out - Run | In - Stop"

 

[Evil Dr. Porkchop]

I’ve never seen that on a deuce before, looks like an add on. What’s it connected to?

 

[GomezTheM35A2C]

I thought the same thing. I'm out of state currently. I'll trace it back when I can. I also thought it might be for a dump bed.

 

[cattlerepairman]

It appears to be between the seats rather than under the dash, so I second a pull/push cable to operate a PTO or hydraulic valve. Throttle cable is also possible but that tends to be on/under the dash.

 

[Guyfang]

Why not look in the TM?

 

[Evil Dr. Porkchop]

I've read through quite a few of the TMs and never noticed it listed, I doubt it's in there. The seat also doesn't look right to me. Unless I'm seeing things funny it looks more like a box driver's seat but in the middle of the cab, definitely not a regular passenger seat.

 

[dmetalmiki]

If you trace that assembly, I would bet is goes to the rear of the transfer case.
And.
It could be a modified "Air shift" actuator for the front axle engage.
In (In) Out (out).
Of 'all wheel drive'........(Or, Most of them with the deuce system).

 

[snowtrac nome]

Im thinking unauthorized MWO, for some kind of pto actuator. Push the plunger in to run the pto pull the plunger out to stop the pto.