Here are the details about where to find info on the clearance light wiring, using the wiring diagrams I linked to above.
Note that you have to be careful to pick out the pages that apply to the Workhorse gas chassis. The diagrams can contain info on the Ford and Workhorse diesel (?!?) chassis.
Rear and Front Clearance Lights, fed by circuit "MM"
Auto Lamps Wiring Diagram
Sheet 1, Zones A-1 through A-8 (PDF page 2)
Sheet 2, Zones A-8 through B-8 (PDF page 3)
Automotive Wiring Diagram
Sheet 1, Zone D-13 (PDF page 3) shows Workhorse I/P (Instrument Panel) Convenience Center, fuse D2
Sheet 1, Zone D-19 (PDF page 4) shows 2-pin connector to front clearance lights
Sheet 1, Zone D-22 (PDF page 4) shows 12-pin connector to rear clearance lights
Location of I/P Convenience Center in coach
Front End Wiring Installation
Sheet 1, Zone B-6 (PDF page 2)
Sheet 2, Zone A-7 (PDF page 3) shows View BB
You can download the complete set of wiring diagrams for your coach at this link
. What's nice about the complete set is that it includes the info in the "secret decoder ring," a.k.a. the "Wiring Identification Guide" (link here