Location of fuse link ignition 1991 mustang

The ecm fuse also powers the pass-key module on the key barrel.
See diagrams below. I recommend you probe the starter enable relay socket to see if it is getting the ground signal from the pass-key decoder whole someone tries to start the car.

Check all the fuse links under the hood. Get a manual for your car at an auto parts store for the locations of them.

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whats the problem

If there is no power going INTO the ignition switch, you most likely have a burned fusible link. The ignition switch gets its power from fusible link "A" It is a 16 Gauge, BLACK fusible link connected to the YELLOW wire for circuit #37. The fusible link is connected to the starter relay located on the left fender apron between the washer fluid reservoir and the strut tower.

Circuit #37splits into 3 "legs" at splice #S105. One leg of this circuit goes to the fuse block where it feeds fuse #1 (15 Amp) and fuse #2 (10 Amp).

The other two legs of this circuit BOTH go to the ignition switch. (you should have TWO large yellow wires connected to the ignition switch.)

You could have your ignition switch coming apart, this was a common problem on these cars. Dont mistake the ignition switch under the column for the ignition key cylinder

An easy way to find it would be to follow your spark plug wires and that will lead you to your coil packs.All coils are mounted in different places and if im not mistaken yours is located on the passenger side on top of the motor.But trace your wires to the coil.

Fuse? Is your ignition fuse the same as some interior lights? Does your dash lights turn on?

1991 Mustang not equipped with DRL.

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

the diagrams are under the lid of the fuse box located under the dash on driverside and on the top of the relay box located under the hood on driverside