2002 F250 - Fuse diagram

here is a link to an f250 wiring diagram "PDF".... this site is a great resource for Ford trucks.... download the pdf file and you will have your answer....
hope this helps...
JP

http://www.ford-trucks.com/forums/1150860-factory-trailer-plug-wiring-diagram.html

2005 Suburban Z71 4WD I had similar situation. No 12 volt positive to 7 trailer. Under my hood at the fuse panel, the red 12v + wire was connected to Stud # 1 which is on the left side of fuse box. There is a square fuse right next to this stud. I put a 40 amp fuse in it. I use this power to charge a battery in a trailer as I am hauling.

Fuse box diagram and description for Ford F250 you find here

https://www.autogenius.info/ford-f-250-1999-2001-fuse-box-diagram/

Not sure about the trailer connector, but you can download a manual here:
http://www.motorcraftservice.com/pubs/content/~WO5F23/~MUS~LEN/36/05f23og3e.pdf
fuses start on page 218

Try this site. http://www.etrailer.com/faq-wiring.aspx. They give color codes and detailed info.
Check your owners manual as there should be a fuse under the hood to feed the trailer 12V trailer feed. On certain vehicles, the feed is controlled by the ignition switch. It won't charge unless the switch is on.

not a fuse check where the trailer light harness is connected to the truck harness

I beleive the diagram is on the inside of the plastic fuse cover, mine is.

2003 Excusion, V10, 2wd, Eddie Bauer

I had a hardtimefinding this informaton, hope it helps.

fuses
Fuse link
cartridge
2A Grey Grey — — —
3A Violet Violet — — —
4A Pink Pink — — —
5A Tan Tan — — —
7.5A Brown Brown — — —
10A Red Red — — —
15A Blue Blue — — —
20A Yellow Yellow Yellow Blue Blue
25A Natural Natural — — —
30A Green Green Green Pink Pink
40A — — Orange Green Green
50A — — Red Red Red
60A — — Blue — Yellow
70A — — Tan — Brown
80A — — Natural — Black
Passenger compartment fuse panel / power distribution box
The fuse panel is located below and to the left of the steering wheel by
the brake pedal. Remove the panel cover to access the fuses.
Roadside Emergencies
To remove the fuse panel cover,
turn the panel fasteners
counterclockwise.
To remove a fuse use the fuse puller
tool provided on the fuse panel
cover.

The fuses are coded as follows.
Roadside Emergencies
Fuse/Relay
Location
Fuse Amp
Rating
Passenger Compartment Fuse Panel
Description
1 15A* Adjustable pedals
2 20A* Power point -floor console
3 20A* Power point – 3rd row
4 20A* Power point -instrument panel
20A* Power point -right rear quarter
6 20A* Trailer tow turn/stop relay
7 30A* High beam headlamps / Flash to pass
8 — Not used
9 20A* Heated mirrors
10A* A/C clutch
11 20A* Radio (main)
12 20A* Cigar lighter / OBD II
13 5A* Power mirrors/switches
14 15A* Daytime running lamps
10A* Driver’s seat module memory
16 15A* Rear seat controller
17 15A* Exterior lamps
18 20A* Turn lamps/Brake on-off switch (high)
19 10A* Body security module/4x4 module
— Not used
21 25A* Rear wiper motor
22 20A* Engine control
23 20A* Engine control
24 15A* Air suspension
10A* 4-Wheel Anti-Lock Brake System
(4WABS) module
26 10A* Airbags
27 15A* Ignition switch Run feed
28 10A* EATC module module/Front blower relay
coil
29 10A* Customer access
Roadside Emergencies
Fuse/Relay
Location
Fuse Amp
Rating
Passenger Compartment Fuse Panel
Description
30 15A* Highbeam headlamps
31 15A* Clutch interlock switch
32 5A* Radio (start)
33 15A* Front wiper
34 10A* Brake on-off switch
35 10A* Instrument cluster
36 10A* PCM Keep-Alive
37 15A* Horn
38 20A* Trailer tow park lamps and backup lamps
39 — Not used
40 20A* Fuel pump
41 10A* Instrument cluster
42 15A* Delayed accessory
43 10A* Fog lamps
44 10A* PATS module, transceiver
45 10A* Ignition switch Run/ Start feed
46 10A* Left-hand lowbeam
47 10A* Right-hand lowbeam
48 10A* Rear wiper motor
101 30A** Trailer tow electric brake
102 30A** Door locks/Body security module
103 50A** Ignition switch
104 40A** Heated backlite
105 30A** Injector driver module
106 30A** Front wiper main
107 40A** Front blower motor
108 40A** Auxiliary blower motor
109 30A** Heated seats
110 50A** Ignition switch
111 30A** 4WD/Shift on the fly
112 30A** Left-hand power seats

Roadside Emergencies
Fuse/Relay
Location
Fuse Amp
Rating
Passenger Compartment Fuse Panel
Description
113 30A** Starter motor
114 30A** Right-hand power seats
115 20A** Trailer tow battery charge
116 30A** Ignition switch
601 30A CB Door window motors
602 60A** 4-Wheel Anti-Lock Brake System
(4WABS) module
210 — Not used
211 — Not used
212 — Not used
301 — Front blower motor relay
302 — Powertrain (EEC) relay
303 — Injector driver module relay (Diesel
only)
304 — Heated backlite relay
305 — Trailer tow battery charge relay
306 — Delayed accessory relay
307 — Starter relay
* Mini Fuses ** Maxi Fuses

You will need to get a 12 volt test light and check the trailer connector for a voltage signal to the trailer, it may also have seperate fuses under the hood for the trailer lights if the system is factory installed, federal law requires the 2 systems be isolated, if there are blown fuses find the short in the trailer before replacing fuse(s), with no exceptions the short is always in the trailer. Hint, check the fuses 1st.

For Ford's fuse diagrams and schemes you may want to check Ford diagrams schemes imgVEHICLE com