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2004 Ford Mustang Light Bulb Size Guide
High & Low Beam Headlamp Light Bulb Size:
9007LL
Parking Light Bulb Size:
3157NALL
Front Turn Signal Light Bulb Size:
3157NALL
Rear Turn Signal Light Bulb Size:
3157LL
Tail Light Bulb Size:
3157LL
Stop Light Bulb Size:
3157LL
High Mount Stop Light Bulb Size:
906
Fog/Driving Light Bulb Size:
899
9145
License Plate Light Bulb Size:
168
Back Up Light Bulb Size:
3156LL
Front Sidemarker Light Bulb Size:
3157NALL
Rear Sidemarker Light Bulb Size:
168
Ash Tray Light Bulb Size:
161
Glove Box Light Bulb Size:
194
Map Light Bulb Size:
194
578
Dome Light Bulb Size:
578
Trunk/Cargo Area Light Bulb Size:
906
Under Hood Light Bulb Size:
906

2004 Ford Mustang Car Stereo Radio Wiring Diagram
Radio Constant 12V+ Wire: Purple/Light Blue
Radio Switched 12V+ Wire: Black/Pink
Radio Ground Wire: Black/Light Green, Black
Radio Illumination Dimmer Wire: Light Blue/Red
Radio Antenna Trigger Wire: Orange/Light Blue
Front Speakers Size: N/A
Front Speakers Location: N/A
Left Front Speaker Wire (+): Orange/Light Green
Left Front Speaker Wire (-): Light Blue/White
Right Front Speaker Wire (+): White/Light Green
Right Front Speaker Wire (-): Green/Orange
Rear Speakers Size: N/A
Rear Speakers Location: N/A
Left Rear Speaker Wire (+): Gray/Light Blue
Left Rear Speaker Wire (-): Tan/Yellow
Right Rear Speaker Wire (+): Orange/Red
Right Rear Speaker Wire (-): Brown/Pink

2004 Ford Mustang Car Alarm Wiring Diagram
Battery Constant 12v+ Positive Wire (+): Yellow and Light Green/Purple
Battery Constant 12v+ Positive Wire Location: Ignition Switch Harness
Starter Positive Wire (+): White/Pink
Starter Positive Wire Location: Ignition Switch Harness
Ignition Positive Wire (+): Red/Light Green
Ignition Positive Wire Location: Ignition Switch Harness
Second Ignition Positive Wire (+): Red/Black
Second Ignition Positive Wire Location: Ignition Switch Harness
Accessory Positive Wire (+): Gray/Yellow
Accessory Positive Wire Location: Ignition Switch Harness
Second Accessory Positive Wire (+): Black/Light Green
Second Accessory Positive Wire Location: Ignition Switch Harness
Parking Light Positive Wire (+): Brown
Parking Light Positive Wire Location: At GEM (26-Pin Plug, Pin 7). The GEM (generic electronic module) is located above the drivers kick panel.
Power Door Lock Positive Wire (+): Light Green
Power Door Lock Positive Wire Location: At GEM (20 Pin Plug, Pin 20). The GEM (generic electronic module) is located above the drivers kick panel.
Power Door Unlock Positive Wire (+): Purple
Power Door Unlock Positive Wire Location: At GEM (20 Pin Plug, Pin 18). The GEM (generic electronic module) is located above the drivers kick panel.
Door Trigger Negative Wire (-): Yellow/Black and Gray/Red (Right). Use both wires. This vehicle has 2 door trigger wires at the gem module, when connecting to an alarm system, use both door trigger wire and diode isolate.
Door Trigger Negative Wire Location: At GEM (20 Pin Plug, Pins 13 and 5). The GEM (generic electronic module) is located above the drivers kick panel.
Domelight Supervision Wire: Black/White
Domelight Supervision Wire Location: At GEM (20pin Plug, Pin 3). The GEM (generic electronic module) is located above the drivers kick panel.
Trunk Release Negative Wire (-): Pink/Light Green
Trunk Release Negative Wire Location: At GEM (26 Pin Plug, Pin 25). The GEM (generic electronic module) is located above the drivers kick panel.
Horn Negative Negative Wire (-): Yellow/Light Green
Horn Negative Negative Wire Location: At GEM (26 Pin Plug, Pin 12). The GEM (generic electronic module) is located above the drivers kick panel.
Tachometer Wire Negative Wire (-): Any Wire That Is Not Red Or White/Light Blue
Tachometer Wire Negative Wire Location: At Any Ignition Coil Or Fuel Injectors
Brake Light Positive Wire (+): Red/Light Green
Brake Light Positive Wire Location: At Switch Above Brake Pedal
Factory Alarm Disarm Wire (-): Dark Green/Purple
Factory Alarm Disarm Wire Location: At GEM (20 Pin Plug, Pin 16). The GEM (generic electronic module) is located above the drivers kick panel.
Factory Anti-Theft Wire (-): Fords PATS Anti-Theft (Some Vehicles) Transponder System
Factory Anti-Theft Wire Location: Transponder At Ignition Switch Tumbler