2018 FORD F-350 relay

Protected Components
Fuse Rating
Fuse or Relay
Number
Not used.
—
1
Memory seat switch (lumbar power).
7.5A 1
2
Driver door unlock relay.
20A 1
3
Aftermarket electronic brake controller.
5A 1
4
Trailer brake controller Brake On/Off.
Customer access circuits.
Not used.
—
5
Not used.
—
6
Not used.
—
7
Driver window switch mirror fold.
10A 2
8
Brake On/Off / Pressure Switch.
10A 2
9
Not used.
—
10
Combined sense security module.
5A 2
11
Front climate control module.
7.5A 2
12
Instrument cluster.
7.5A 2
13
Smart data link.
Steering column control module.
Extended power restraints module.
10A 2
14
Smart datalink connector power.
10A 2
15
Tailgate release solenoid.
15A 1
16
Head-up display.
5A 2
17
Push button ignition switch.
5A 2
18
Ignition switch.
Key inhibit.
Transmission control switch (tow/haul).
7.5A 2
19
Select Shift switch.
324
Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 201709, Second Printing Fuses

Protected Components
Fuse Rating
Fuse or Relay
Number
Active front steering module.
7.5A 2
20
Head-up display.
5A 2
21
Humidity sensor.
Upfitter switch.
5A 2
22
Run/Start.
PTO relays.
Accessory delay.
10A 1
23
Power windows.
Moonroof.
Power folding mirrors relay.
Inverter.
Window/moonroof switch illumination.
Central locking system relay.
20A 1
24
Left-hand front smart window motor.
30A 1
25
Door zone module.
Right-hand front smart window motor.
30A 1
26
Door zone module.
Moonroof.
30A 1
27
Sony amplifier - 10 channel.
20A 1
28
Not used.
—
29
Not used.
—
30
Adjustable pedals switch.
15A 1
31
SYNC.
10A 1
32
GPS module.
Display.
Radio frequency receiver.
Radio.
20A 1
33
Run-start relay.
30A 1
34
Extended power restraints module.
5A 1
35
325
Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 201709, Second Printing Fuses

Protected Components
Fuse Rating
Fuse or Relay
Number
Lane keeping system.
15A 1
36
Automatic high beam control.
Auto-dimming mirrors.
Rear heated seats.
Camera module.
Heated steering wheel.
20A 1
37
Rear power window switch.
30A 3
38
1 Micro 2 fuse.
2 Micro 3 fuse.
3 Circuit breaker.
CHANGING A FUSE
Fuses WARNING
Always replace a fuse with one that
has the specified amperage rating.
Using a fuse with a higher amperage
rating can cause severe wire damage and
could start a fire. If electrical components in the vehicle are
not working, a fuse may have blown. Blown
fuses are identified by a broken wire within
the fuse. Check the appropriate fuses
before replacing any electrical
components.
326
Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 201709, Second Printing FusesE217331

•
An authorized dealer needs to install
mobile communications systems.
Improper installation may harm the
operation of your vehicle, particularly
if the manufacturer did not design the
mobile communication system
specifically for automotive use.
• If you or an authorized Ford dealer add
any non-Ford electrical or electronic
accessories or components to your
vehicle, you may adversely affect
battery performance and durability. In
addition, you may also adversely affect
the performance of other electrical
systems in the vehicle. The auxiliary switch option package
provides six switches mounted in the
overhead console. These switches operate
when the vehicle is running or from battery
power, depending on the switchable fuse
AUXF4's location in the upfitter relay box.
We recommend, however, that the engine
remain running to maintain battery charge
when using the auxiliary switches for
extended periods of time or higher current
draws.
Note:
When your vehicle has a diesel
engine, use the auxiliary switches only when
the engine is running. The glow plugs also
drain battery power when the ignition key is
in the on position. Using the auxiliary
switches, even for limited amounts of time,
can cause your battery to drain quickly and
prevent your vehicle from restarting. When switched on, the auxiliary switches
provide electrical battery power for a
variety of personal or commercial uses.
Switches 1 through 4 provide 25 amps.
Switches 5 and 6 provide 40 amps.
The relay box for the auxiliary switches is
in the rear of the engine compartment,
near the back wall. See your authorized
dealer for service.
The relays are coded as shown:
576
Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 201709, Second Printing AccessoriesE220728 E220729

Fuse Amp Rating
Wire Color
Circuit Number
Switch
25A
Gray with brown
trace
CB113A
AUX 4
40A
Brown with blue
trace
CB115A
AUX 5
40A
Gray with orange
trace
CB118A
AUX 6
Upfitter Interface Module (If Equipped)
The Upfitter Interface Module (UIM) is an
electronic control module that operates
equipment (such as lift buckets, cranes,
motors, salt spreaders and snow plows)
with external relays.
If you replace the module, it will require
additional programming by the upfitter.
Obtain this data directly from the upfitter
company. The upfitter contact information
is in the vehicle door opening.
For more information on the Upfitter
Interface Module and the auxiliary
switches, contact your upfitter.
578
Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 201709, Second Printing Accessories