They are truck oem factory installed spare switches. They can be connected to pretty much anything 12volt operated. My Haulmark built 2007 Freightliner Coronado has 1 OPT switch in the dash and it is hooked to....NOTHING.
Pull the dash panel that the switches are in and look at the back of the switches and look at the wires, if there are any non-factory looking wires hooked to those switches follow them. Otherwise chances are they are available for you to use.
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2007 Haulmark 3329DS, Freightliner Coronado Chassis, 515hp Detroit, Meritor Freedomline 12speed Autoshift, 10kw Generator, In-motion Satellite.
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