I want to add fog lamps to my '01 Mustang convertible. I can get the lamps, brackets & dash switch from Ford at reasonable prices. My question: Does the existing wiring harness include wiring for the fog lamps? Is the add-on installation simply a matter of installing the hardware and plugging everything together? Is there any relay in the circuit? Any other hints or advice is welcome. Thanks, Russ

Fig. Headlamps (1999) - ZOOM LINK

Check links...

Fig. Courtesy Lamps, Page 01 (1999)

Fig. Courtesy Lamps, Page 02 (1999, Coupe, Convertible/Hard Top)

Fig. Courtesy Lamps, Page 03 (1999, Convertible/Soft Top)

Fig. Courtesy Lamps, Page 04 (1999)

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Yes, you have one in each door frame;



Fig. Headlamps (1999) - ZOOM LINK


Check links...
Fig. Courtesy Lamps, Page 01 (1999)
Fig. Courtesy Lamps, Page 02 (1999, Coupe, Convertible/Hard Top)
Fig. Courtesy Lamps, Page 03 (1999, Convertible/Soft Top)
Fig. Courtesy Lamps, Page 04 (1999)

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day

Yes, check frame door;

Yes, you have one in each door frame;



Fig. Headlamps (1999) - ZOOM LINK


Check links...
Fig. Courtesy Lamps, Page 01 (1999)
Fig. Courtesy Lamps, Page 02 (1999, Coupe, Convertible/Hard Top)
Fig. Courtesy Lamps, Page 03 (1999, Convertible/Soft Top)
Fig. Courtesy Lamps, Page 04 (1999)

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day

I don't know how you wired it into your electrical system. But, this is how you should have done it. Two ground wires, one from each lamp need to be grounded to the vehicles frame. The other two power leads from each lamp need to run to the switch in the vehicles cabin area. The power supply from the battery should have a 20 amp circuit breaker between the power supply (battery) and the switch it connects too. The fog lamps draw a lot of amps and if you hook to an existing power supply you will cause an overload and thus they will heat the circuit breaker up until it opens the circuit. They will not come on again until the breaker cools off. You can purchase a circuit breaker from any auto parts store. They are cheap and easy to obtain. You can mount it in the engine compartment on the fenderwell between your battery and the switch.

relays are normally in the fuse panel on the left side of dash by knee.

Fuses and Circuit Breakers Location and Values
NOTE: The headlamp switch (11654) has an integral 20-amp circuit breaker.

• The combination instrument panel fuse and circuit breaker panel contains most of the fuses and circuit breakers used in the system.
• The fuses and circuit breakers are color-coded by amp rating.
• The locations and values of the fuses and circuit breakers not contained in the panels are shown in the following chart.

Circuit Circuit Protection and Rating Location Headlamps and High Beam Indicator 20 Amp. CB Integral with Lighting Switch Heated Back Window 16 GA Fuse Link Engine Compartment Power Windows, Power Seat, Power Door Locks 20 Amp. CB Starter Motor Relay Load Circuit Fuse Link In Harness Engine Compartment Lamp Fuse Link In Harness Convertible Top 25 Amp. CB Lower Instrument Panel-Reinforcement



Cavity Number Fuse Rating Color Circuit Protected A 40 Amp Orange

• Ignition Switch

B 40 Amp Orange

• Ignition Switch

C 40 Amp Orange

• Ignition Switch

D 50 Amp Red

• Headlamp Switch
• Instrument Panel Fuses 4, 8 and 16
• Instrument Panel Circuit Breaker 12

E 20 Amp Light Green

• PCM
• Fuel Pump
• HO2S (3.8L)
• Canister Purge Solenoid
• EVR Solenoid
• Ignition Control Module (3.8L)
• IAC Solenoid
• Fuel Injector
• Automatic Transmission
• Camshaft Position Sensor (3.8L)
• MAF Sensor

F 40 Amp Orange

• Heated Back Window

G 20 Amp Yellow

• Fuel Pump

H 60 Amp Blue

• Fan Control

J — — Not Used K 10 Amp Blue

• Anti-Lock Brake Control Module

L 20 Amp Red

• Fan Control Monitor (PCM)

M 25 Amp Yellow

• Horn
• Foglamps
• Daytime Running Lights Control Module

N 25 Amp Clear

• Fuses 5 and 9

P 20 Amp Clear

• Radio Amplifier

Q 20 Amp Yellow

• Generator

S 30 Amp Yellow

• Convertible Top Motor

T 60 Amp —

• ABS

a bad relay is your most likely cause.  It's inside the fuse box.

do you have the fog lamps on at the same time? If yes, don't use them.

If not, it could be the headlamp switch. Something is drawing too much current.

the fog light is normally one complete assembly that you just unplug from the outside and replace with a new one auto zone is a good place to help with this