Where are any fuses
I have found trailer light fuses in the fuse pnl under the hood in some vehicles. I am wondering if you may have another issue though. Very first thing I would verify is good ground on both the truck and trailer wiring. It seems odd that all the light fuses are blown. The next thing I'd look into would be the trailer lights to verify that the circuit boards are in good shape etc... (Assuming they are LED) you may have a compatibility issue between the truck and trailer. If the truck was set up for an LED lighting trailer but your trailer has conventional lights, the resistance will be drastically different and can cause all sorts of trouble. Just a thought if your fuses turn out to be ok or continually blow. Good luck!
My 1999 e350 trailer lights did not work right until i changed the second battery on the right side of frame by the side door.
SOURCE: i need a digram for the fuse box on a ford e350
is in manual if year is after 1996 is free from ford
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp
SOURCE: 2007 ford e350 van, reverse lights wont work
On the side of your transmission will be a switch with several wires coming out of it. This is your reverse switch that turns on your reverse lights and most likely needs to be replaced
SOURCE: 2001 Ford F150 need a fuse box diagram. Hooked up
You can download a PDF version of the owners manual from Ford
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp
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