trailer wiring harness / fuses

Can anyone tell me if there is another fuse block in the 1995 Ford E350 van besides the one under the dash? I have a factory installed wiring harness for a trailer but there is no left or right turn/stop signal coming out at the rear connector. I have traced the harness up to the front with no turn/stop signals and suspect a fuse problem. However, the main fuse block does not have any blown fuses. Is there another for the signal lights? All other signals are present: run light, electric brake, backup. I do not have a manual-- purchased it used. Thanks in advance.

The "underhood" fuse and relay box is located next to and below the brake master cylinder undre the hood (sort of next to the radiator). Getting the cover off is a PITA, but look there.

ModMech thanks a BILLION! Found it. After I cleaned up the cover I could read "POWER DISTRIBUTION". Of coarse, but with all the dirt, I did not see it. And you are right, it is a MAJOR PITA to get at. Would have never guessed it to be there. Thanks again. If you ever get up this way, I owe you a fishing trip! G. Hnatiuk