The 15 amp fuse for my park lamps keeps blowing, i even put a twenty in and that blew

You have a short to ground in the park light circuit..best have a mechanic look at it because its possible the trailer wiring was faulty and shorted out the Smart Junction Box (SJB)...the park lamp relay is controlled by it and the relay is built into the SJB

As with any electrical problem where a fuse blows, you will have to trace the circuit to find the overload or short to ground. It could be any of the lamp sockets or in the wiring harness.

Sounds like the magnet in the a/c clutch has failed.

I think your problem locating the fuse may be because Ford refers to the lights you are describing as "PARK" lamps, instead of "TAIL" lamps. The PARK fuse is Fuse #22 (15 Amp) located in the Smart Junction Box (SJB) in the center of the dash.

HINT: This same fuse also protects the circuits your front park lamps, if they are working, the fuse is not blown.

I strongly suggest your first priority will be to discover why your tail lights are seemingly consuming many times more current than they should. A 30 amp fuse has less resistance than a 10 amp though the difference is hardly measurable.

I suspect when that is sorted out the other faults could disappear without further effort.

It is time to find a circuit diagram and to trace the tail light wiring from the supply to the lamps in order to discover what went wrong.

put a 12 volt light bulb in place of the fuse. It will stay lit until you find the short circuit. Check tail and park light & side marker bulbs first.

How about if you just turn parking lights on, not headligths

check transfer case electrical switch, sometime if it bad it will also blow the fuse. don't recommend you put any higher fuse than recommend, If the fuse blow there is a short some where and by putting higher amp fuse you might short or burn something else beside the fuse. if that check out than check your transfer case motor, might lock up and not allowing the motor to turn instead it short the fuse. don't drive the car, just leave it in park, put correct fuse amp back in and unplug transfer case electric switch and turn the key on (dont start the car) and see if the fuse blow; if not plug it back in and see if it blow the fuse. if that is not the case, unplug transfer case wire, and do the same and see if it blow the fuse.

Obviously a short somewhere. Check sockets for corrosion, rust etc where current could be traveling across, as well as take a look at wiring into rear if you can get to it. One other thing you could try to isolate, would be to try one bulb in at a time, perhaps one will cause fuse to blow & other won't, which will give you a reference point to start looking.

replace your brake pressure switch on the master cylinder and that should take care of your problem.