Ford F350 (1987 – 1991) – fuse box diagram

Year of production: 1987, 1988, 1989, 1990, 1991

Fuse box

No.	A	Circuits
1	15	Stoplights, Hazard Lights, Speed Control
2	7	Circuit Breaker: Windshield Wiper Motor
3	—	—
4	15	Main Light Switch, Exterior Lights, Instrument Panel Illumination
5	15	Turn Signals, Back-Up Lights, Overdrive Transmission, Roof Map Light
6	15	Speed Control, Accessories & 4WD, Auxiliary Battery Control, Digital Clock, Rear Window Defogger, Feedback Carburetor Control (4.9L), Windshield Wiper Switch, Electronic Shift Control Module, Rear Anti-Lock Brakes
7	—	—
8	15	Courtesy Lights, Dome Lights, Cargo Light, Glove Box Light, Warning Buzzer, Radio
9	30	Heater or A/C-Heater
10	5	Instrument Illumination (Radio, Instrument Cluster, Wiper and Washer Switch, Overdrive Switch, 4WD Shift Control Switch, A/C-Heater Control, Rear Window Defogger, Ashtray, Cigarette Lighter), Main Light Switch, Clock Dimming, Radio Display Dimming
	20	Rear Anti-Lock Brakes
11	15	Radio & Clock Illumination, Headlight Switch Illumination
	10	Radio
12	30	Circuit Breaker: Power Door Locks
	25	Transfer Case Control
	25	Tailgate Power Window, Power Mirrors
13	5	Instrument Panel Illumination
14	30	Circuit Breaker: Power Windows
	25	Tailgate Power Window
15	10	Auxiliary Fuel Tank, Switch
16	30	Horn Relay (with Cruise Control), Horn Relay Jumper (without Cruise Control), Cigarette Lighter, Speed Control, Ashtray Illumination
	20	Horn, Cigarette Lighter
	10	Horn
17	5	Instrument Illumination, Clock & Radio Display Dimming
	20	Rear Anti-Lock Brakes
18	15	Cluster, Safety Belt Buzzer, Warning Indicators, Tachometer, Diesel Glow Plug Control (6.9L, 7.3L), Diesel Indicators (6.9L, 7.3L), Electronic Engine Control (EEC), Carburetor Circuits, Choke Heater, Electric Fuel Pump Control (7.5L), Dual Brake Warning Diode-Resistor, Low Vacuum Warning Switch (6.9L, 7.3L)

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.