The High-Current Fuses And Relays Are Coded As Follows - Ford 1999 F-350 Owner's Manual

Roadside emergencies

The high-current fuses and relays are coded as follows.

Fuse/Relay Fuse Amp
Location Rating
1 7.5A *
2 10A*
3 7.5A*
4 20A*
5 20A*
(Gasoline
only)
5A* (Diesel
only)
6 -
(Gasoline
only)
10A*(Diesel
only)
150
Description
Trailer Tow Left Stop/Turn Lamp
Air Bag Module
Trailer Tow Right Stop/Turn Lamp
Trailer Tow Backup Lamps, Trailer Tow
Park Lamps
Gasoline only-PCM, Two Speed Fuel Pump
Relay Coil, Fuel Pump Relay Coil, Mass Air
Flow Sensor, Fuel Injectors
Diesel only-Dual Alternator A Field
Gasoline only-Not Used
Diesel only-Single or Dual Alternator A
Field, Regulator