Mystery Switches - Spartan Chassis

[JB Texas]

While crawling on the floor next to the driver's seat, I spied a box behind the panel to the left of the steering column. There are 3 rocker style switches on the box. I can't see any labels and the switch's location makes it unlikely that they are intended for regular usage. I can't find anything in the Spartan manual on them. Ideas, anyone?

[JB Texas]

While crawling on the floor next to the driver's seat, I spied a box behind the panel to the left of the steering column. There are 3 rocker style switches on the box. I can't see any labels and the switch's location makes it unlikely that they are intended for regular usage. I can't find anything in the Spartan manual on them. Ideas, anyone?

[BucknJeff]

Well, here's a good guess...

Those buttons were supplied by the chassis manufacturer, and intended for use in other applications where these switches would be dash mounted. Cummins and Cat engines on freightliner chassis have the same thing, so I'm making a leap here.

One may be for idle speed, and the other two may be for the cruise control.

The two cruise control buttons are mirrored with your smart wheel. The idle control is not intended to be user adjusted under most circumstances.

Again, this is a guess...