In the fuse box under the hood, fuse in position 20 is a 7.5amp fuse for the trailer left turn circuit, fuse in position 22 is a 7.5 amp fuse for the right turn circuit, if the fuses are good and you have power at them it is going to be wiring, at the back of the truck close to the driver side at the bumper is a gray connector that will take factory wiring to you trailer wiring the yellow wire is left turn/brake light, the green wire is right turn/brake light, and the brown is tail lights, and the orange wire is 12volt feed for if there is a battery on the trailer that needs to be kept charged for break away safty brakes.
No power to electric brakes on ford f350
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Is the diagram on the fuse box missing? the fuse for auxiliary lights might be in the box next to the battery, but you can just check them all with a fuse tester. You can also register on AutoZone's website and register your vehicles to get free manuals, which include the electrical diagrams with fuse box info. It is a pretty slick free way to get a manual. Hope this helped a little, matt
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