relay FORD E-350 2021 Owners Manual

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 your
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, for example fuses or relays,
related to towing. See
Fuses
(page 151).
Your vehicle's load capacity
designation is by weight, not by
volume, so you cannot necessarily
use all available space when
loading your 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.
• Select a draw bar with the
correct rise or drop. When both
the loaded vehicle and trailer
are connected, the trailer frame
should be level, or slightly
angled down toward your
vehicle, when viewed from the
side.
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
correct trailer loading and setting
your vehicle up for towing is
located in another chapter of this
Owner's Manual. See
Load Limit
(page 120). You can also find the
information in the RV & Trailer
Towing Guide. See an authorized
dealer.
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Protected Component
Fuse
Rating
Fuse
Number
Horn.
20 A
1
Blower motor.
50 A
2
Not used.
—
3
Starter relay.
30 A
4
Not used (spare).
20 A
5
Upfitter relay 4 (cutaway).
20 A
6
Not used (spare) (stripped chassis).
Not used.
—
8
Not used.
—
10
Power point 4.
20 A
12
Yaw sensor (stripped chassis).
10 A
13
Not used (spare) (cutaway).
Forward looking radar (cutaway).
10 A
14
Not used (spare) (stripped chassis).
Not used.
—
15
Not used.
—
16
Powertrain control module run/start feed.
10 A
17
Anti-lock brake system run/start feed.
10 A
18
Not used.
—
19
Wiper power.
30 A
20
Not used.
—
21
Wiper module (stripped chassis).
10 A
22
Not used (spare) (cutaway).
Not used.
—
23
Body control module - run power in feed 2.
40 A
24
Body control module - run power in feed 1.
50 A
25
Not used.
—
26
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Protected Component
Fuse
Rating
Fuse
Number
Body builder frame connector.
20 A
27
Not used.
—
28
B+ power 12 V(special order vehicle).
10 A
29
Power driver seat (cutaway).
30 A
30
Not used (spare) (stripped chassis).
Not used.
—
31
Vehicle power 1.
20 A
32
Vehicle power 2.
20 A
33
Vehicle power 3.
10 A
34
Vehicle power 4.
20 A
35
Not used.
—
36
Not used.
—
37
Washer relay (stripped chassis).
10 A
38
Not used (spare) (cutaway).
Not used.
—
39
Trailer brake control connector.
30 A
41
Instrument panel connector (stripped chassis).
30 A
43
Not used (spare) (cutaway).
Not used.
—
45
A/C clutch.
10 A
46
Upfitter relay 1 (cutaway).
40 A
47
Not used (spare) (stripped chassis).
Not used.
—
48
Pump electronics module.
30 A
49
Injectors.
15 A
50
Power point 1.
20 A
51
B-pillar vehicle connector (cutaway).
50 A
52
Not used (spare) (stripped chassis).
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Protected Component
Fuse
Rating
Fuse
Number
Trailer tow park lamps.
30 A
53
Upfitter 2 relay (cutaway).
40 A
54
Not used (spare) (stripped chassis).
Upfitter 3 relay (cutaway).
20 A
55
Not used (spare) (stripped chassis).
Power point 2 prep B-pillar connector.
20 A
56
USB smart charger.
5 A
58
Park lamps 1 (special order vehicle).
10 A
59
Not used.
—
60
Not used.
—
61
Not used.
—
62
Not used.
—
63
Not used.
—
64
Not used.
—
65
Not used.
—
66
Not used.
—
67
Not used.
—
69
Inverter.
40 A
70
Anti-lock brake system valves.
30 A
71
Brake on and off switch.
10 A
72
Not used.
—
73
Not used.
—
74
Not used.
—
75
Anti-lock brake system pump.
60 A
76
Voltage quality module power - body control module.
30 A
77
Trailer tow stop lamps.
10 A
78
Not used.
—
79
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Protected Component
Fuse
Rating
Fuse
Number
Trailer tow backup lamps.
10 A
80
Not used.
—
81
Run/start fuse - upfitter relays (cutaway).
5 A
82
B+ fuse - upfitter relay.
Not used.
—
83
Not used.
—
84
Not used.
—
85
Not used.
—
86
Not used.
—
87
Not used.
—
88
Not used.
—
89
B-pillar (cutaway).
40 A
91
Instrument panel (stripped chassis).
Park lamps 3 (special order vehicle).
10 A
93
Park lamps 2 (special order vehicle).
10 A
94
Stop lamp relay.
20 A
95
Not used.
—
96
Engine.
50 A
97
B-pillar vehicle connector.
Instrument panel.
Trailer tow battery charge.
30 A
98
Instrument panel connector.
40 A
99
Not used.
—
100
Not used.
—
101
Not used.
—
102
Not used.
—
103
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E-Series (TE4) Canada/United States of America, enUSA, Edition date: 201910, First-Printing Fuses

Protected Component
Fuse
Rating
Fuse
Number
Not used.
—
104
Trailer tow right-hand and left-hand stop and direction indicator relay
power.
15 A
105
Note: Spare fuse amperage may vary. Protected Component
Fuse Rating
Relay Number
Powertrain control module.
—
R02
Power relay.
Not used.
—
R05
Passenger Compartment Fuse Box WARNING: Always disconnect the
battery before servicing high current
fuses.
Note: If your vehicle has dual batteries,
disconnecting the primary under hood
battery does not remove power from all
circuits. The fuse panel is to the left-hand side of
the brake pedal and mounted onto the
lower left-hand cowl panel. Remove the
fuse panel cover to access the fuses.
To remove a fuse, use the fuse puller tool
provided on the inside of the fuse panel
cover.
Replace fuses with the same type and
rating. See
Changing a Fuse (page 159).
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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 vehicle is
running or from battery power, depending
on the switchable PDB fuse locations #82
and #83. Ford recommends, however, that
the engine remain running to maintain
battery charge when using the auxiliary
switches for extended periods of time or
higher current draws.
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 switches include the fuse and relay kit.
This kit contains the required fuses and
relays that an authorized technician needs
to install into the power distribution box,
located under the hood. Refer to the
instruction sketch included in the kit.
Contact an authorized dealer for service.
Each switch includes a power lead (a
blunt-cut and sealed wire) located in the
underhood cowl shield above the engine
block powertrain control module.
The power leads are coded as follows:
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Fuse
Amp
Rating
Wire
Color
Circuit
Number
Switch
40A
Yellow
CAC05
AUX 1
40A
Green
with
Brown Trace
CAC06
AUX 2
20A
Violet
with
Green Trace
CAC07
AUX 3
20A
Brown
CAC08
AUX 4
Learn more about auxiliary switches by
visiting
https://www.fleet.ford.com/truckbbas/.
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.
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