engine FORD F750 2012 12.G Workshop Manual

Unloaded or lightly loaded vehicles
The braking system has been designed to safely stop your vehicle when
fully loaded to its GVWR.
WARNING:When operating empty or lightly loaded, sudden or
hard braking may induce wheel lockup with loss of vehicle
control and the possibility of accident and serious injury, especially on
wet or slippery road surfaces.
TRAILER TOWING
Towing a trailer places an additional load on your vehicle’s engine,
transmission, axle, brakes, tires and suspension. Inspect these
components carefully prior to and after any towing operation.
Consult your local motor vehicle speed regulations for towing a trailer.
Your vehicle’s load capacity is designated by weight, not by volume, so you
cannot necessarily use all available space when loading a vehicle. 2nd unit
bodies are not included in maximum trailer weight ratings. The weight of the
additional “body” must be subtracted from the maximum trailer weight.
Note:Do not exceed the GVWR or the GAWR specified on the
certification label.
Note:Do not exceed the GCWR rating or transmission damage may occur.
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.
Model Maximum
GVWR - lb (kg)Maximum
GCWR
F-650 Pro-Loader (Kick-Up
Frame)20500–26000
(9299–11792)*
F-650 Pro-Loader (Straight
Frame)/F-650 Straight Frame20500–29000
(9299–13154)*
F-750 25999–37000
(11793–16783)*
* Specific GCWR and maximum trailer weight applicable to a given
F–650/750 model is dependent on many variables including
transmission capability. Check with your sales consultant for the exact
rating on your vehicle.
Driving
147
2012 F-650/750(f67)
Supplement, 2nd Printing
USA(fus)

•Turn off the speed control. The speed control may shut off
automatically when you are towing on long, steep grades.
•Use a lower gear to eliminate excessive shifting and assist in
transmission cooling.
•Allow more distance for stopping with a trailer attached; anticipate
stops and brake gradually.
Servicing after towing
If you tow a trailer for long distances, your vehicle requires more
frequent service intervals. Refer to theScheduled Maintenance Guide
chapter for more information.
Trailer towing tips
•Practice turning, stopping and backing up before starting on a trip to
get the feel of the vehicle trailer combination. When turning, make
wider turns so the trailer wheels clears curbs and other obstacles.
•Allow more distance for stopping with a trailer attached.
•If you are driving down a long or steep hill, shift to a lower gear. Do
not apply the brakes continuously, as they may overheat and become
less effective.
•
The trailer tongue weight should be 10–15% of the loaded trailer weight.
•If you are towing a trailer frequently in hot weather, hilly conditions,
at GCW, or any combination of these factors, consider refilling your
rear axle with synthetic gear lube if not already so equipped. Refer to
Lubricant specificationsin theMaintenance and Specifications
chapter for the lubricant specification. Remember that regardless of
the rear axle lube used, do not tow a trailer for the first 500 miles
(800 km) of a new vehicle, and that the first 500 miles (800 km) of
towing be done at no faster than 70 mph (112 km/h) with no full
throttle starts.
•After you have traveled 50 miles (80 km), thoroughly check your
hitch, electrical connections and trailer wheel lug nuts.
•
To aid in engine/transmission cooling and A/C efficiency during hot
weather while stopped in traffic, place the gearshift lever in P (Park) (if
available on your automatic transmission) or N (Neutral) (manual
transmissions and automatic transmissions withoutaP[Park] position).
•Vehicles with trailers should not be parked on a grade. If you must
park on a grade, place wheel chocks under the trailer’s wheels.
Driving
149
2012 F-650/750(f67)
Supplement, 2nd Printing
USA(fus)

Passenger compartment fuse panel
The fuse box is located behind the passenger airbag cover and can be
accessed through the glove box.
Fuse/Relay
locationFuse amp
ratingFuse description
1 20A Horn
2 15A Flasher relay
3 20A Power point
4 10A Data Link Connector (DLC), Engine
diagnostic connector, Parking brake warning
5 15A Run relay
6 — Not used
7 — Not used
8 5A Radio, GEM
9 5A Power window relay
10 15A Heated mirrors
11 5A Wiper and washer systems
12 10A Transmission shift selector
13 20A Radio/SYNC, Power mirrors
14 10A Interior lamp relay
Roadside Emergencies
154
2012 F-650/750(f67)
Supplement, 2nd Printing
USA(fus)

Fuse/Relay
locationFuse amp
ratingFuse description
15 10A Interior lamp relay
16 15A High beams, Indicator
17 — Not used
18 5A Dimmer switch, Interior lighting
19 15A Engine control (diesel engine only)
20 5A Starting system
21 10A DRL resistor
22 15A Air horn, Air suspension dump, Two-speed
axle, Driver-controlled locking differential
23 10A Flasher relay
24 15A Hydraulic brakes relay, Fuel heater relay
(diesel engine only), Air dryer
25 10A Blower motor relay coil
26 10A Right-hand low beam headlight
27 — Not used
28 10A Left-hand low beam headlight
29 10A Cluster, GEM
30 15A Allison electronic transmission
31 15A Mirror fold relay
Relay 1 — Interior lamps
Relay 2 — Not used
Relay 3 — Horn
Relay 4 — Not used
Relay 5 — Not used
Roadside Emergencies
155
2012 F-650/750(f67)
Supplement, 2nd Printing
USA(fus)

Power distribution box
WARNING:Always disconnect the battery before servicing high
current fuses.
WARNING:To reduce risk of electrical shock, always replace
the cover to the Power Distribution Box before reconnecting the
battery or refilling fluid reservoirs.
Fuse/Relay
locationFuse amp
ratingFuse description
1 20A Upfitter switches (AUX 2 and AUX 4)/Trailer
12V socket pin
2 30A Power seat (driver)
3 30A Power seat (passenger)
4 15A Windshield washer relay, Washer pump motor
5 5A Brake warning switch (hydraulic brake only)
6 20A Upfitter switches (AUX 1 and AUX 3)
7 15A Brake pressure switches, ABS event relay
8 20A DEF (Urea), Line heaters (diesel engine
only)
9 20A Ignition switch, Starter cutoff
503
502
501304
303
302 301
2119 22 2024
23401
207 201202 203204
209 206
208 205602
601118114
110106
102
117 113 109105
101
116 112 108104
115 111 107103
18 16
14 12 10 864
2
17 15
13 11 9 753
1
Roadside Emergencies
156
2012 F-650/750(f67)
Supplement, 2nd Printing
USA(fus)

Fuse/Relay
locationFuse amp
ratingFuse description
10 15A Air tank moisture removal valve
11 30A Electric trailer brake
12 20A Passenger compartment fuse box 5 and 21
13 15A Instrument cluster/Gateway module
14 20A Nitrogen oxide sensor (diesel engine only)
15 — Not used
16 5A BendixAir ABS
17 — Not used
18 10A Fuel transfer pump
19 15A Powertrain control module power 1 (gasoline
engine only)
20 10A Powertrain control module power 2 (gasoline
engine only)
21 20A Powertrain control module power 3 (gasoline
engine only)
22 20A Powertrain control module power 4 (gasoline
engine only)
23 — Not used
24 10A Powertrain control module keep-alive power
(gasoline engine only)
101 30A Bendix Air ABS relay (Air brake vehicles
only)
Hydraulic brakes module (Hydraulic brake
vehicles only)
102 20A Ignition switch
103 20A Ignition switch, Passenger compartment fuse
box fuses 19, 29 and 30
104 20A Power point
105 20A Power door lock switches
106 30A Main light switch, Multi-function switch
107 50A Passenger compartment fuse box fuses 1, 2,
3, 4, 12, 13, 14 and 15
Roadside Emergencies
157
2012 F-650/750(f67)
Supplement, 2nd Printing
USA(fus)

Fuse/Relay
locationFuse amp
ratingFuse description
108 40A Fuel heater (diesel engine only)
20A Fuel pump module (gasoline engine only)
109 40A Power window
110 30A Windshield wiper
111 30A Body builder relay, Parking lamps
112 40A Blower motor
113 30A Heated seats, Air-Ride seat
114 20A Aftertreatment DCU
115 20A Ignition switch, Passenger compartment fuse
box fuses 8, 9, 10 and 11
116 30A Left/Right turn relays, Back-up lamp relay
117 20A Stoplamps
118 60A Hydraulic brake vehicles (Trailer tow package
only)
601 60A Trailer socket
602 60A Air brake trailer tow fuse block
30A Hydraulic brakes pump motor 2
201 — Windshield washer relay
202 — Wiper high/low relay
203 — Wiper run/park relay
204 — Windshield wiper relay
205 — Body builder relay, right turn
206 — Body builder relay, left turn
207 — ABS event relay (Hydraulic brake vehicles
only)
208 — Body builder relay, back-up lamps relay
209 — Auxiliary stoplamp relay
301 — Fuel heater/Fuel transfer pump relay (diesel
engine only)
— Fuel pump module (gasoline engine only)
302 — Body builder relay, parking lamps relay
303 — Blower motor relay
Roadside Emergencies
158
2012 F-650/750(f67)
Supplement, 2nd Printing
USA(fus)

Fuse/Relay
locationFuse amp
ratingFuse description
304 — DEF (Urea) line heaters relay (diesel engine
only)
— Powertrain control module power VPWR1
(gasoline engine only)
Individual maxi-fuse holder in engine compartment
Fuse
locationFuse amp
ratingFuse description
9925 30A Hydraulic brakes pump motor 1
Relay center
The relay center is located along the passenger side A-pillar on the right
side of the footwell.
Relay
locationRelay description
R1 Spring applied hydraulic release warning chime module or
PCM power VPWR 2, 3 and 4
R2 A/C compressor clutch
R3 Power windows
R4 Flasher (standard/LED)
R5 Upfitter relay 1
R6 Upfitter relay 2
R7 Headlights
R8 Spare
R1
R9 R10 R11 R12 R13 R14 R15 R16 R17
R18 R19 R20 R21 R22 R23 R24 R25 R26
R2 R3 R4 R5 R6 R7 R8
Roadside Emergencies
159
2012 F-650/750(f67)
Supplement, 2nd Printing
USA(fus)

Relay
locationRelay description
R9 Upfitter relay 3
R10 Starter
R11 DCU (diesel engine only)
R12 Two–speed axle/Differential lock
R13 Door lock
R14 Air tank moisture valve
R15 DRL #1
R16 Heated mirrors
R17 Spare
R18 Upfitter relay 4
R19 Shift interlock/EPRNDL display
R20 Selective Catalyst Reduction (SCR) system (NOx) (diesel
engine only)
R21 Run
R22 Door unlock
R23 ABS warning indicator
R24 DRL #2
R25 Park lights
R26 Spare
Roadside Emergencies
160
2012 F-650/750(f67)
Supplement, 2nd Printing
USA(fus)

Inline fuses
Your vehicle may have several inline fuses located in/on the battery
cables located in the battery box depending on application.
•All Allison transmission equipped vehicles have a 10 Amp fuse located
in the clean power cables located in the battery box.
•All vehicles have a 30 Amp fused located in the clean power cables
located in the battery box.
•All vehicles equipped with an Eaton transmission have a 30 Amp fuse
located in the clean power cables located in the battery box.
•All Hydraulic brake equipped vehicles have a 40 Amp fuse located in
the clean power cables located in the battery box and in addition
another 30 Amp fuse located in a fuse holder just above the power
distribution center located in the vehicles engine compartment.
JUMP STARTING
WARNING:The gases around the battery can explode if
exposed to flames, sparks, or lit cigarettes. An explosion could
result in injury or vehicle damage.
WARNING:Batteries contain sulfuric acid which can burn skin,
eyes and clothing, if contacted.
Do not attempt to push-start your automatic transmission
vehicle. Automatic transmissions do not have push-start
capability. Attempting to push-start a vehicle with an automatic
transmission may cause transmission damage.
Before connecting a fast-charger, booster battery or installing a new
battery, make sure the ground polarities of the fast-charger, booster
battery or alternator (when installing a battery) are matched to the
ground polarity of the vehicle battery. Improper usage of the
fast-charger, hook-up of booster battery or installation of a new battery
can cause damage to the electrical system or to the alternator. Do not
attempt to polarize the alternator.
Roadside Emergencies
162
2012 F-650/750(f67)
Supplement, 2nd Printing
USA(fus)