iim looking in the schematics and don't see fuse 32 I see fuses 1,15,19,24,33,46 and 47.
If its fuse 33 check fuse 15. if 15 is good check park lamp relay. Fuse 15 gets its power from the battery
Battery ->fuse 15 -> parking lamp relay -> fuse 33 ->trailer plug. 7-pin and 4-pin is the same.
EDIT:Found fuse 32. Parking lamp relay goes to fuse 32,33,34
EDIT:Added picture
EDIT: Looks like fuse 15 is a 50 Amp and coming straight off the battery. I hope this helps