yo,
As Treeline cited;
from; 1996 F-150, F-250, F-350, F-Super Duty Chassis Cab, Motorhome Chassis, and Bronco Workshop Manual
DESCRIPTION AND OPERATION
Trailer Towing Package Wiring
Vehicles equipped with the trailer towing package have the following additions to support the trailer wiring:
A set of relays in engine control sensor wiring (12A581) (Bronco) or engine compartment (14A346) (F-Series) and connector on the rear lamp wiring (14405), located in the rear bumper area.
The trailer feed wiring (13A576) is supplied with the vehicle and installed at the time of pre-delivery.
Vehicles are equipped with a wiring feed, located under the instrument panel, for a trailer brake control unit.
Trailer Tow Wiring (Rear Frame), Bronco
Item Part Number Description
1 13A409 Wiring Assembly
2 N801846-S36MG Screw
3 14405 Wiring Assembly
4 — Locators, Position in Holes Provided (Part of 14405)
5 — Trailer Tow Ground Wire (Part of 14405)
6 14086 Wiring Assembly
A — Tighten to 5-7 Nm (44-62 Lb-In)
Trailer Tow, Bronco
Item Part Number Description
1 — Locator, Position in Hole Provided (Part of 13A576)
2 — Rear Crossmember
3 — To 14086 Wiring Assembly
4 12964 Adapter (Kit Stowed in Vehicle for Customer Installation)
5 N806820-S55 Tapping Screw
6 13A576 Wiring Assembly
7 — Locator (Not Used) (Part of 13A576)
8 — To 13A409 Wiring Assembly
9 17906 Bumper
10 14405 Wiring Assembly
A — Tighten to 22-28 Nm (16-21 Lb-Ft)
Instrument Panel Wiring Installation, F-150, F-250, F-350 and Bronco (Gasoline Engines)
Item Part Number Description
1 — To Headlamp Switch
2 — To Fuse Box
3 14A282 Retainer Assembly
4 N606678-S39 Screw
5 — Connector (Part of 12A581)
6 — Connector (Part of 14A504)
7 13A506 Locator, Position in Hole Provided
8 — To Park Signal Lamp Switch
9 — To Multi-Function Switch
10 — To Stoplight Switch
11 — Clip (Part of 14401)
12 — E4OD Pigtail (Part of 14401)
13 — To Ignition Switch and Steering Column Wiring
14 — To 14405
15 — To Starter Switch Clutch Interlock
16 — Take-Out to Shift on the Fly Switch and Electric Defrost Switch (Part of 14401)
17 — To Warning Buzzer Chime
18 — Remote Keyless Entry Programming Connector
19 15K602 Remote Keyless Entry Module
20 — Air Bag Module
21 14A163 Retainer Assembly
22 — To Trailer Brake Controller
23 14A099 Shield
24 — Vacuum Hose Clip (Part of Vacuum Harness)
25 — Ashtray Wiring (Part of 13726)
26 15A044 Cigar Lighter
27 — PSOM Test Circuit (Part of 14401)
28 — To Bowden Cable
29 18813 Radio Antenna
30 — Brake Anti-Lock Module Test Circuit (Part of 14401)
31 — To 14630
32 — To 14B095
33 — To 18A586
34 — To Right Courtesy Lamp Switch
35 — To Inertia Switch
36 14463 To Ground
37 — To Clearance Lamp F-Series Only for Continuation
38 — Wiper Control Module
39 2C018 Rear Brake Anti-Lock Module (F-150, F-250, F-350 Only)
40 — To Glove Box Lamp
41 — To Heater Mode Switch
42 — To A/C Illumination
43 — To A/C Blower Switch
44 — To Power Point
45 — To Radio
46 18B849 Premium Sound Amplifier
47 14B166 Shift on the Fly Switch
48 — To 14A262 Electric Defrost (Bronco Only)
49 14401 Wiring Assembly
50 — To Cluster (Plug A)
51 — To PSOM
52 — To Cluster (Plug B)
53 14B155 Cap
54 04320 Instrument Panel
55 9A050 Dual Fuel Tank Switch (F-Series Only)
56 14529 Rear Window Control Switch (Bronco Only)
57 — Demister Hose
58 — To Glove Box Lamp
Dash Panel and Relay Wiring, F-Series with Trailer Tow Package
Item Part Number Description
1 12A581 Wiring Assembly
2 12A581 To Powertrain Control Module (Except Diesel)
3 N801817-S2 Screw
4 12A581 Power Distribution Box, Wiring Assembly
5 — Locator, Position in Hole Provided
6 14405 Wiring Assembly
7 — Cap (Dual Rear Wheels Without Trailer Tow) (Part of 12A581)
8 — Cap (Bronco, Diesel or F-Series with Daytime Running Lamps, Without Trailer Tow)
Electrical Schematics, Trailer Towing Package Wiring
Multi-Function Switch
Trailer Adapter Connector
Pin Number Circuit Circuit Function
1 963 (BK/LB) Trailer Backup Lamps
2 49 (O) Trailer Battery Charge
3 64 (DG) Trailer RH Turn Signal
4 43 (DB) Trailer Brakes
5 206 (W) Trailer Ground
6 52 (Y) Trailer LH Turn Signal
7 962 (BR/W) Trailer Running Lamps
Relay Connectors
Pin Number Circuit Circuit Function
86 298 (P/O) Fuse to Relay Coil
87 37 (Y) Fuse to Relay Switch
87a — Not Used
30 49 (O) Relay Switch to Trailer Battery Charge
85 57 (BK) Ground
Pin Number Circuit Circuit Function
86 140 (BK/PK) Backup Lamps to Relay Coil
87 37 (Y) Fuse to Relay Switch
87a — Not Used
30 963 (R/Y) Relay Switch to Trailer Backup Lamps
85 57 (BK) Ground