2003 FORD F SERIES MOTORHOME AND COMMERCIAL CHASSIS battery location

Fuse/Relay
LocationFuse Amp
RatingPassenger Compartment Fuse
Panel Description
9 20A Stoplamps: Trailer tow Electric
Brake controller feed, Body
builder rear turn/stop feeds, Body
builder stop lamp feed, Trailer
turn/stop fuse feeds
10 5A Instrument cluster memory,
Power brake assist lamp*
11 30A Wiper/Washer module, Wiper feed
12 10A Trailer tow stop/turn feed
13 10A ABS module
14 10A Warning chime module, Power
brake assist module*, Instrument
cluster power, Instrument cluster
warning lamps, Transmission
control switch
15 15A Left turn signal feed
16 20A Body builder battery (+12V) feed
17 5A Body builder radio feed
18 — Not used
19 5A DRL relays
20 — Not used
21 15A Right turn signal feed
22 — Not used
23 — Not used
24 — Not used
25 10A Right-hand low beam headlamp
feed
26 10A Speed control module, Brake shift
interlock actuator
27 — Not used
28 — Not used
29 — Not used
Roadside emergencies
40

Fuse/Relay
LocationFuse Amp
RatingPassenger Compartment Fuse
Panel Description
30 — Not used
31 10A Left-hand low beam headlamp
feed
32 10A Backup lamp feed
33 — Not used
34 — Not used
35 20A Body builder high beam feed,
High beam indicator
36 — Not used
37 — Not used
38 10A Body builder accessory feed (run
only)
39 — Not used
40 — Not used
41 10A Instrument illumination
42 — Not used
43 — Not used
44 — Not used
Relay 1 — Left turn signal relay
Relay 2 —— Courtesy lamps relay
Relay 3 Right turn signal relay
*Vehicles with Hydromax brake assist only
Power distribution box
The power distribution box is located in the engine compartment. The
power distribution box contains high-current fuses that protect your
vehicle’s main electrical systems from overloads.
Always disconnect the battery before servicing high current
fuses.
Always replace the cover to the power distribution box before
reconnecting the battery or refilling fluid reservoirs
If the battery has been disconnected and reconnected, refer to the
Batterysection of theMaintenance and specificationschapter.
Roadside emergencies
41

Fuse/Relay
LocationFuse Amp
RatingPower Distribution Box
Description
6 20A* Parklamp feeds, Instrument panel
fuse #41, Warning chime module,
Trailer tow running lamp relay
coil, I/P dimmer module
7 15A* Starter relay coil, BB neutral
sense
8 10A* Stoplamp switch (logic): Brake
pressure switch, Power brake
assist module***, Speed control
module, PCM, Anti-lock Brake
System (ABS) module, Brake shift
interlock actuator
9 5A* Alternator
10 20A* Daytime Running Lamps (DRL)
11 30A* Ignition coils, Radio capacitors #1
and #2, PCM relay
12 20A* Trailer tow running lamps feed,
Trailer tow back-up lamps feed, IP
- backup lamp feed
13 30A** Trailer tow electric brake
controller feed
14 60A** IP battery feed (fuse #9, 15, 21)
15 -- Not used
16 60A** ABS module
17 -- Not used
18 20A** Horn feed
19 -- Not used
20 40A** PCM relay
21 20A** Fuel pump motor
22 20A** Diagnostic tool connector, Cigar
lighter feed
23 40A** Blower motor feed
Roadside emergencies
43

Fuse/Relay
LocationFuse Amp
RatingPower Distribution Box
Description
24 40A** IP battery feed (fuses #4, 10, 16)
25 50A** Ignition switch feed (IP fuses #1,
5, 7, 11, 13, 14, 17, 19, PDB fuses
#7, 9, 11)
26 60A** Ignition switch feed (IP fuses #5,
11, 17, 26, 32, 38)
27 30A** Multifunction switch (headlamps)
28 — Not used
29 60A** Power brake assist motor***
Relay 1 — DRL on/off relay
Relay 2 — Fuel pump relay
Relay 3 — Horn relay
Relay 4 — A/C system relay
Relay 5 — Blower motor relay
Relay 6 — PCM relay
Diode 1 — PCM diode
Diode 2 — Park brake diode
* Mini Fuses ** Maxi Fuses ***
Vehicles with Hydromax brake assist only
Relay module
The relay box is located by the power distribution box in front of the
radiator in the engine compartment.
The relays are coded as follows:
Relay location Description
1 Back up Lamp
2 Running Lamp
3 Not Used
4 Headlamp DRL
12 43
Roadside emergencies
44

SERVICE RECOMMENDATIONS
To help you service your vehicle:
•We highlight do-it-yourself items in the engine compartment for easy
location.
•We provide a scheduled maintenance guide which makes tracking
routine service easy.
If your vehicle requires professional service, your dealership can provide
the necessary parts and service. Check yourWarranty Guide/Owner
Information Guideto find out which parts and services are covered.
Use only recommended fuels, lubricants, fluids and service parts
conforming to specifications. Motorcraft parts are designed and built to
provide the best performance in your vehicle.
PRECAUTIONS WHEN SERVICING YOUR VEHICLE
•Do not work on a hot engine.
•Make sure that nothing gets caught in moving parts.
•Do not work on a vehicle with the engine running in an enclosed
space, unless you are sure you have enough ventilation.
•Keep all open flames and other lit material away from the battery and
all fuel related parts.
Working with the engine off
1. Set the parking brake and shift to P (Park).
2. Turn off the engine and remove the key.
3. Block the wheels.
Working with the engine on
1. Set the parking brake and shift to P (Park).
2. Block the wheels.
Note:Do not start your engine with the air cleaner removed and do not
remove it while the engine is running.
Maintenance and specifications
55