Go to Autozone.com and register your truck for FREE. Then you can get access to Chassis wiring diagrams and fusebox layouts. The plastic cover on your trailer plug will have the id for each pin in the plug.
The factory chassis diagram should show the fuse providing power to the individual post on the plug.
SOURCE: running lights on trailer are not working
There is one 15@ fuse in position #5 of the passenger compartment panel down by the brake pedal. There is also one in the power distribution box under the hood. The box is located by the brake booster and opens from the firewall side. It is a rectangular black box right inside the fender. The fuse is a 15@ mini fuse in location #9. It is purple.
SOURCE: were is fuse for trailer running lights ford f250 ...
Passenger Compartment Fuse Panel, Fuse # 38.
This is in the Owners Manual on page 209. If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp
Also handy to search for keyword in the PDF version.
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