2003 Mercury Mountaineer fuse box location

Passenger compartment fuse panel (top side)
These relays are located on the reverse side of the passenger
compartment fuse panel. See your dealer or a certified technician for
service of this relay box.
Fuse/Relay Location Description
Relay 1 Flasher relay
Relay 2 Rear defrost
Relay 3 Delayed accessory relay
Relay 4 Open
Relay 5 Battery saver
Relay 6 Open
Relay 7 Open
Roadside Emergencies
170

The high-current fuses are coded as follows:
Fuse/Relay
LocationFuse Amp
RatingPower Distribution Box
Description
1 60A** PJB
2 30A** BSM
3—Not used
4 30A** Rear defrost
5 40A** Anti-lock Brake System (ABS)
pump
6 60A** Delayed accessory
7 20A** Power point #2
8—Not used
9 20A** Power point #1
10 30A** ABS module (valves)
11 40A** PTEC
12 50A** Ignition relay, Starter relay
13 40A** Trailer tow battery, Trailer tow
turn signals
14 10A* Daytime Running Lamps (DRL)
(Canada)
15 15A* Memory (PCM/DEATC/Cluster),
Interior lights
16 15A* Headlamp switch, Foglamp switch
17—Not used
18—Not used
19 20A** High beam relay
20 30A** Electric brake
21 30A** Front wiper motor
22 20A** Low beam
23 30A** Ignition switch
24—Not used
25—Not used
26 15A* Fuel pump
Roadside Emergencies
172

Fuse/Relay
LocationFuse Amp
RatingPower Distribution Box
Description
27 20A* Trailer tow lamps
28 20A* Horn relay
29 60A** PJB
30 20A** Rear wiper motor
31—Not used
32—Not used
33 30A** Auxiliary blower motor
34 30A** Passenger power seat, Adjustable
pedals
35—Not used
36 40A** Blower motor
37 15A* A/C clutch relay, Transmission
38 15A* Coil on plug
39 15A* Injectors, Fuel pump relay
40 15A* PTEC power
41 15A* HEGO, VMV, CMS, PTEC
42 10A* Right low beam
43 10A* Left low beam
44 15A* Front foglamps
45 2A* Brake pressure switch (ABS)
46 20A* High beams
47—Horn relay
48—Fuel pump relay
49—High beam relay
50—Fog lamp relay
51—DRL relay (Canada)
52—A/C clutch relay
53—Trailer tow right turn relay
54—Trailer tow left turn relay
55—Blower motor relay
56—Starter relay
Roadside Emergencies
173

Fuse/Relay
LocationFuse Amp
RatingPower Distribution Box
Description
57—PTEC relay
58—Ignition relay
59—Not used
60—PCM diode
61—A/C clutch diode
62 30A CB Power windows circuit breaker
* Mini Fuses ** Maxi Cartridge Fuses
Rear relay box
The relay box is located on the rear passenger side quarter trim panel.
See your dealer or a certified technician for service of this relay box.
The relays are coded as follows:
Fuse/Relay Location Description
Relay 14 Not used
Relay 15 Trailer tow back-up lamps
Relay 16 Not used
Relay 17 Not used
Relay 18 Not used
Relay 19 Trailer tow park lamps
Roadside Emergencies
174

Fuse/Relay Location Description
Relay 20 Trailer tow battery charge
Relay 21 Not used
Relay 22 Not used
Relay 23 Not used
Diode 3 Not used
Diode 4 Not used
Auxiliary relay box
The relay box is located on the front
right fender well underneath the
speed control module.
The relays are coded as follows:
Fuse/Relay Location Description
Relay 64 Open
Relay 65 Open
Relay 66 Open
Roadside Emergencies
175