No wiring diagram

[Rawze]

BTW: It is my understanding that the only difference of the "skirt" light circuit and the "marker" light circuit and sole reason they are not tied together on the navistar trucks is so that the option can be set in the cab controller to keep them on, or kill them independent of the marker lights (like would be desired on an emergency vehicle) when the battery voltage gets low as part of the "load shedding" program. - otherwise, the skirt lights could have been wired to the same exact circuit as the marker lights.