Trailer Controls
Fifth Wheel Slide Control Switch
Notice: Do not activate the fifth wheel slide control valve while the vehicle is in motion. To do so could cause damage to the fifth wheel member, the kingpin, the cab or trailer, and ultimately to the drivetrain.
The fifth wheel air slide switch permits repositioning of the sliding fifth wheel from inside the cab. See Fig.. Toggling the switch up activates the control valve and unlocks the fifth wheel slide mechanism, allowing changes to the total length of the tractor-trailer and changes to axle loads to comply with varying jurisdictional laws. Toggling the switch down deactivates the control valve and locks the fifth wheel to the baseplate.
Fig. 1, Fifth Wheel Slide Control Switch
For detailed operating instructions for fifth wheel slide, coupling, and uncoupling procedures, see Fifth Wheel Lubrication.
Trailer Auxiliary Switch
The trailer auxiliary switch energizes an optional circuit that allows the trailer electrical system to draw power for functions such as internal lights and battery charging for lift gates.
Toggle up on the switch to activate the trailer auxiliary function. The switch will illuminate green when active. Toggle down to turn trailer auxiliary function off. See Fig..
