2021 FORD F650/750 relay

TOWING A TRAILER
WARNING: Do not exceed
the GVWR or the GAWR
specified on the certification
label. WARNING:
Towing trailers
beyond the maximum
recommended gross trailer
weight exceeds the limit of the
vehicle and could result in engine
damage, transmission damage,
structural damage, loss of
vehicle control, vehicle rollover
and personal injury.
Your vehicle may have electrical
items, such as fuses or relays,
related to towing. See
Fuses
(page 193).
Your vehicle's load capacity
designation is by weight, not by
volume, so you cannot necessarily
use all available space when
loading a vehicle.
Towing a trailer places an extra
load on your vehicle's engine,
transmission, axle, brakes, tires
and suspension. Inspect these
components periodically during,
and after, any towing operation. Load Placement
To help minimize how trailer
movement affects your vehicle
when driving:
•
Load the heaviest items closest
to the trailer floor.
• Load the heaviest items
centered between the left and
right side trailer tires.
• Load the heaviest items above
the trailer axles or just slightly
forward toward the trailer
tongue. Do not allow the final
trailer tongue weight to go
above or below 10-15% of the
loaded trailer weight.
When driving with a trailer or
payload, a slight takeoff vibration
or shudder may be present due to
the increased payload weight.
Additional information regarding
proper trailer loading and setting
your vehicle up for towing is
located in another chapter of this
manual. See
Load Limit (page
168).
You can also find information in
the
RV & Trailer Towing Guide
available at your authorized
dealer, or online. RV & Trailer Towing Guide Online
http://www.fleet.ford.com/towing-guides/
Website
171
F650750 (TBC) , enUSA, Edition date: 202010, Second-Printing Towing

Protected Component
Fuse
Rating
Fuse
Number
Horn.
20 A
1
Blower motor.
40 A
2
Blower motor control.
Not used.
—
3
Starter motor.
30 A
4
Not used.
—
5
Upfitter relay 4.
20 A
6
Not used.
—
8
Not used.
—
10
Not used.
—
12
Run/start spare.
10 A
13
Adaptive cruise control.
10 A
14
Blower motor relay.
10 A
15
Air dryer.
20 A
16
Powertrain control module - ignition status run power.
10 A
17
Glow plug control module - ignition status run power (diesel).
Anti-lock brake system run/start.
10 A
18
Transmission control module.
10 A
19
Ignition status run power (diesel).
Windshield wiper motor.
30 A
20
Not used.
—
21
Not used.
—
22
Alternator 2 (dual alternator only).
10 A
23
Body control module run power 2 bus.
40 A
24
Body control module run power 1 bus.
50 A
25
Not used.
—
26
Body builder battery feed.
20 A
27
194
F650750 (TBC) , enUSA, Edition date: 202010, Second-Printing Fuses

Protected Component
Fuse
Rating
Fuse
Number
Not used.
—
28
Alternator 1 A-Line.
10 A
29
Not used.
—
30
Hydromax pump.
60 A
31
Powertrain control module.
20 A
32
Canister vent solenoid (gas).
20 A
33
Canister purge solenoid (gas).
Variable cam timing actuator 11 (gas).
Heated exhaust gas oxygen sensor (gas).
Urea tank power (diesel).
Exhaust gas recirculation cool bypass valve (diesel).
A/C clutch relay.
10 A
34
Customer access vehicle power 3 feed.
Variable oil pump (diesel).
Cooling fan (diesel).
Fan clutch (gas).
Coil on plug (gas)
20 A
35
Urea tank (diesel).
Glow plug controller (diesel).
Nitrogen oxide sensor control module (diesel).
Particulate matter sensor (diesel).
Fuel volume control value (diesel).
10 A
36
Fuel pressure regulator (diesel).
Not used.
—
37
Not used.
—
38
Not used.
—
39
Trailer brake control module.
30 A
41
Not used.
—
43
Not used.
—
45
A/C clutch solenoid.
10 A
46
Upfitter relay 1.
40 A
47
Upfitter run and accessory feed.
20 A
48
195
F650750 (TBC) , enUSA, Edition date: 202010, Second-Printing Fuses

Protected Component
Fuse
Rating
Fuse
Number
Pump electronics module (gas).
30 A
49
Fuel pump (diesel).
Injector power (gas).
15 A
50
Power point #1.
20 A
51
Not used.
—
52
Trailer tow park lamp.
30 A
53
Not used.
—
54
Upfitter relay 3.
20 A
55
Not used.
—
56
USB power.
5 A
58
Not used.
—
59
Dual fuel tank selector switch (diesel).
10 A
60
Not used.
—
61
Not used.
—
62
Driver seat compressor.
20 A
63
Passenger seat compressor.
20 A
64
Not used.
—
65
Four pack solenoid differential lock.
10 A
66
Hydromax relay power.
10 A
67
Not used.
—
69
Inverter.
40 A
70
Anti-lock brake system valves.
30 A
71
Brake on-off switch (hydraulic brakes).
10 A
72
Stop lamp air pressure switch 1 and 2 (air brakes).
Not used.
—
73
Heated mirror.
15 A
74
Not used.
—
75
196
F650750 (TBC) , enUSA, Edition date: 202010, Second-Printing Fuses

Protected Component
Fuse
Rating
Fuse
Number
Body control module battery feed.
60 A
76
Body control module voltage quality monitor power feed.
30 A
77
Transmission module (diesel).
10 A
78
Hydromax pump monitor.
5 A
79
Trailer tow backup signal.
10 A
80
Not used.
—
81
Upfitter switch (factory location for ignition power).
5 A
82
Upfitter switch (optional location for power at all times).
5 A
83
Not used.
—
84
Not used.
—
85
Not used.
—
86
Not used.
—
87
Cargo lamps.
10 A
88
Not used.
—
89
Not used.
—
91
Not used.
—
93
Not used.
—
94
Stop lamps.
20 A
95
Trailer tow stop lamps.
Not used.
—
96
Not used.
—
97
Trailer tow battery charge.
30 A
98
Upfitter relay 2.
40 A
99
Glow plug controller (diesel).
25 A
100
Not used.
—
101
Not used.
—
102
Not used.
—
103
197
F650750 (TBC) , enUSA, Edition date: 202010, Second-Printing Fuses

Protected Component
Fuse
Rating
Fuse
Number
Not used.
—
104
Trailer tow stop and turn relay.
15 A
105
Note: Spare fuse amperage may vary. Protected Component
Fuse
Rating
Relay
Number
Not used.
—
R02
Not used.
—
R05
Passenger Compartment Fuse Box
The fuse panel is in the passenger footwell.
Remove the panel cover to access the
fuses. Pull the fuse panel cover toward you to
remove it. When the clips of the panel
disengage, let the panel fall easily.
Use the provided fuse puller tool to remove
a fuse. It is on the fuse panel cover.
Replace fuses with the same type and
rating. See Changing a Fuse (page 201).
198
F650750 (TBC) , enUSA, Edition date: 202010, Second-Printing FusesE145984

Protected Component
Fuse Rating
Fuse Number
Ignition switch.
5 A
20
Exhaust brake switch.
5 A
21
Not used.
—
22
Left-hand front window motor.
30 A
23
Not used.
—
24
Not used.
—
25
Right-hand front motor window.
30 A
26
Not used.
—
27
Not used.
—
28
Relay folding mirror.
15 A
29
Brake signal for air brake.
5 A
30
Customer access stop lamp signal.
Brake on-off isolation relay.
Trailer tow stop lamp relay.
Upfitter interface module.
10 A
31
Remote radio frequency receiver.
Radio.
20 A
32
Not used.
—
33
Not used.
—
34
Tow haul switch.
5 A
35
Lane departure warning camera.
15 A
36
Not used.
—
37
Left-hand front power window switch (four
window units).
30 A
38
Note: Spare fuse amperage may vary.
200
F650750 (TBC) , enUSA, Edition date: 202010, Second-Printing Fuses

AUXILIARY SWITCHES (IF
EQUIPPED)
For maximum vehicle performance, keep
the following information in mind when
adding accessories or equipment to your
vehicle:
• When adding accessories, equipment,
passengers and luggage to your
vehicle, do not exceed the total weight
capacity of the vehicle or of the front
or rear axle (GVWR or GAWR as
indicated on the Safety Compliance
Certification label). Ask an authorized
dealer for specific weight information.
• The Federal Communications
Commission (FCC) and Canadian
Radio Telecommunications
Commission (CRTC) regulate the use
of mobile communications systems
equipped with radio transmitters, for
example, two-way radios, telephones
and theft alarms. Any such equipment
installed in your vehicle should comply
with Federal Communications
Commission (FCC) and Canadian
Radio Telecommunications
Commission (CRTC) regulations, and
should be installed by an authorized
dealer.
• 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 four switches, mounted in the
center of the instrument panel. These
switches operate when the ignition is on
or from battery power, depending on the
switchable power distribution box fuse
locations #82 and #83. 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 while
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 20 amps or 40 amps of electrical
battery power for a variety of personal or
commercial uses.
The relays for the auxiliary switches are in
the power distribution box under the hood
by the right-hand fender. See your
authorized dealer for service.
Each switch includes a power lead, a
blunt-cut and sealed wire below the
instrument panel and to the left of the
steering column in the driver footwell area.
The power leads are coded as shown:
315
F650750 (TBC) , enUSA, Edition date: 202010, Second-Printing AccessoriesE163431