2018 FORD F-53 relay

TOWING A TRAILER
WARNINGS
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. Do not exceed the GVWR or
the GAWR specified on the
certification label. Note:
See Recommended
Towing Weights (page 49).
Your vehicle may have electrical
items, such as fuses or relays,
related to towing. See
Fuses
(page 68).
Your vehicle's load capacity
designation is by weight, not by
volume, so you cannot necessarily
use all available space when
loading a vehicle or trailer.
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 ball mount with the
correct rise or drop and load
capacity. 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
proper trailer loading and setting
your vehicle up for towing is
located in another chapter of this
manual. See
Load Limit (page
43).
You can also find information in
the
RV & Trailer Towing Guide
available at your authorized
dealer, or online.
48
Motorhome (TY3) Canada/United States of America, enUSA, Edition date: 201712, Second Printing Towing

Protected Components
Fuse Rating
Fuse or Relay
Number
Power brake assist module – HydroMax.
5A 1
1
Air conditioning compressor clutch.
10A 1
2
Catalyst monitor sensor.
20A 1
3
Engine heated exhaust gas oxygen sensor
#11 and #21.
Vapor management valve.
Powertrain control module relay coil.
5A 1
4
Powertrain control module keep alive
memory.
Powertrain control module power.
20A 1
5
Instrument panel dimmer module.
20A 1
6
Park lamp feeds.
Trailer tow running lamp relay coil.
Ignition coils.
20A 1
7
Radio capacitors.
HydroMax – Anti-lock brake system
module.
30A 1
8
Powertrain control module.
10A 1
9
Daytime running lamps.
20A 1
10
Fuel pump relay coil.
20A 1
11
Powertrain control module.
Fuel pump diode.
Instrument panel - backup lamp feed.
25A 1
12
Trailer tow backup lamps feed.
Trailer tow electric brake controller feed.
30A 2
13
Instrument panel battery feed (fuse #15,
21).
60A 2
14
Lighting primary fuse.
Power distribution box fuse #19.
Trailer tow park lamps.
20A 2
15
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Motorhome (TY3) Canada/United States of America, enUSA, Edition date: 201712, Second Printing Fuses

Protected Components
Fuse Rating
Fuse or Relay
Number
Anti-lock brake system module –
HydroMax.
60A 2
16
Anti-lock brake system module – Hydro-
boost.
40A 2
Horn feed.
20A 2
17
Backup lamp relay coil.
20A 2
18
A/C clutch coil.
A/C demand switch.
Brake on/off switch.
20A 2
19
Multifunction switch.
Powertrain control module relay (Power
distribution box fuses # 3, 5, 7, 18).
30A 2
20
Fuel injectors.
20A 2
21
Fuel pump motor.
Mass air flow sensor.
Powertrain control module.
Cigar lighter feed.
20A 2
22
Diagnostic tool connector.
Blower motor feed.
40A 2
23
Instrument panel battery feed (fuses #4,
10, 16, 22).
50A 2
24
Ignition switch feed (Instrument panel
fuses #1, 5, 7, 11, 13, 14, 17, 19, 23, 36; Power
distribution box fuses #9, 11).
40A
2
25
Fuse holder #2.
Ignition switch feed (Instrument panel
fuses #5, 11, 17, 23, 38).
40A 2
26
Headlamps.
30A 2
27
Daytime running lamps on/off relay coil.
Headlamp daytime running lamp relay
feed.
High beam headlamps flash to pass.
(Instrument panel fuses #25, 31).
Starter relay feed.
30A 2
28
70
Motorhome (TY3) Canada/United States of America, enUSA, Edition date: 201712, Second Printing Fuses

Protected Components
Fuse Rating
Fuse or Relay
Number
Starter motor solenoid.
Power brake assist motor – HydroMax.
60A 2
29
Fuse holder #1.
Anti-lock brake system module – Hydro-
boost.
40A 2
A/C clutch relay.
—
R1
Fuel pump relay.
—
R2
Horn relay.
—
R3
Starter relay.
—
R4
Blower motor relay.
—
R5
Powertrain control module relay.
—
R6
Fuel pump diode.
—
Diode 1
Air conditioning clutch diode.
—
Diode 2
1 Mini fuse.
2 Maxi fuse.
71
Motorhome (TY3) Canada/United States of America, enUSA, Edition date: 201712, Second Printing Fuses

F59 Power Distribution Box
Protected Components
Fuse Rating
Fuse or Relay
Number
Air conditioning compressor clutch.
10A 1
F1
Anti-lock brake system - HydroMax.
30A 1
F2
Powertrain control module keep alive
memory.
5A 1
F3
Powertrain control module relay coil.
Not used.
—
F4
Trailer tow running lamp relay coil.
20A 1
F5
Park lamp feeds.
Instrument panel dimmer module.
Not used.
—
F6
72
Motorhome (TY3) Canada/United States of America, enUSA, Edition date: 201712, Second Printing FusesE197657

Protected Components
Fuse Rating
Fuse or Relay
Number
Trailer tow backup lamp feed.
25A 1
F7
Backup lamp feed.
Not used.
—
F8
Daytime running lamps.
20A 1
F9
Not used.
—
F10
Not used.
—
F11
Not used.
—
F12
Not used.
—
F13
Not used.
—
F14
Power brake assist module (HydroMax).
5A 1
F15
Powertrain control module power.
20A 1
F16
Catalyst monitor sensor.
20A 1
F17
Engine heated exhaust gas oxygen sensor
#11 and #21.
Vapor management valve.
Radio capacitors.
20A 1
F18
Ignition coils.
Powertrain control module.
10A 1
F19
HydroMax module brake on/off relay feed.
10A 1
F20
Powertrain control module.
20A 1
F21
Fuel pump diode.
Fuel pump relay coil.
Brake transmission shift interlock.
10A 1
F22
Not used.
—
F23
Not used.
—
F24
Blower motor relay feed.
40A 2
J1
Headlamps.
30A 2
J2
High beam headlamps flash to pass.
73
Motorhome (TY3) Canada/United States of America, enUSA, Edition date: 201712, Second Printing Fuses

Protected Components
Fuse Rating
Fuse or Relay
Number
Daytime running lamps on/off relay coil.
Headlamp daytime running lamp relay
feed.
Instrument panel fuses #25, 31.
Vehicle power.
30A 2
J3
Powertrain control module relay feed.
Power distribution box fuse F16, F17, F18,
J22.
Cigar lighter feed.
20A 2
J4
Diagnostic tool connector.
Not used.
—
J5
Starter relay feed.
30A 2
J6
Starter motor solenoid.
Anti-lock brake system module (Hydro-
boost).
40A 2
J7
Power brake assist motor (HydroMax).
60A 2
Power distribution box fuse #F20.
Trailer tow park lamps.
20A 2
J8
Instrument panel fuse #4, 10, 16, 22.
50A 2
J9
HydroMax anti-lock brake system module.
60A 2
J10
Hydroboost anti-lock brake system
module.
40A 2
Fuel pump relay feed.
20A 2
J11
Fuel injectors.
Mass air flow sensor.
Fuel pump motor.
Powertrain control module.
Trailer tow electronic brake.
30A 2
J12
Ignition switch feed (instrument panel
fuses #1, 5, 7, 11, 13, 14, 17, 19, 23, 36).
40A 2
J13
(Power distribution box fuse #F19, F22,
F21).
Not used.
—
J14
74
Motorhome (TY3) Canada/United States of America, enUSA, Edition date: 201712, Second Printing Fuses

Protected Components
Fuse Rating
Fuse or Relay
Number
Instrument panel battery feed (fuse #15,
21).
60A 2
J15
Lighting primary fuse.
Horn.
20A 2
J16
Ignition switch feed (instrument panel
fuses #5, 11, 17, 23, 38).
40A 2
J17
Brake on/off switch.
20A 2
J18
Multifunction switch.
Not used.
—
J19
Not used.
—
J20
Not used.
—
J21
Reverse lamp relay coil.
20A 2
J22
A/C clutch relay coil.
A/C demand switch.
Horn relay.
—
R1
Fuel pump relay.
—
R2
Starter relay.
—
R3
Backup lamps relay.
—
R4
Brake on/off signal isolating relay
(Hydromax).
—
R5
Trailer tow parking lamps relay.
—
R6
Not used.
—
R7
A/C clutch relay.
—
R8
Not used.
—
R9
Starter relay.
—
R10
Blower motor relay.
—
R11
Daytime running lamp/headlamp relay.
—
R12
Powertrain control module relay.
—
R13
Fuel pump diode.
—
D1
75
Motorhome (TY3) Canada/United States of America, enUSA, Edition date: 201712, Second Printing Fuses