2021 Ford Mustang Electrical Parts

This table covers the alternators that charge the battery and run the electrical load. Typical signs include dim lights at idle, a battery lamp, or a growl from the charging pulley. Load-test the battery and inspect the belt and grounds — a bad ground mimics a failed alternator. Read more

21 Alternator / Generator parts are listed for the 2021 Ford Mustang, from MOTORCRAFT, PURE ENERGY, REMY and 4 other brands. MOTORCRAFT GL8966 carries the "Popular" badge.

In the New grade, MOTORCRAFT, WAI GLOBAL and TYC supply 7 parts: brand-new units rather than rebuilt ones. A representative part number is MOTORCRAFT GL8966.

In the Remanufactured grade, PURE ENERGY, REMY, TERREPOWER and 1 other brand supply 14 parts: factory-rebuilt units with new wear components. A representative part number is FVP 10289.

This table covers the pulleys on the alternator shaft. Typical signs include a growl or chirp that follows engine speed, or a pulley that will not spin freely by hand. Spin each pulley with the belt off. Roughness or play means replace it with the belt. Read more

2 Alternator / Generator Pulley parts for the 2021 Ford Mustang come from 2 brands — CONTINENTAL and LITENS.

Listed part numbers: CONTINENTAL 49946 and LITENS 920027A.

This table covers the batteries listed by group size and specification. Typical signs include slow cranking, a battery lamp, or a no-start after the vehicle sat overnight. Confirm group size and terminal layout in the notes. Clean the posts and the ground before condemning the battery. Read more

3 Battery parts for the 2021 Ford Mustang come from 3 brands — DEKA, FULLRIVER and MOTORCRAFT.

This group includes DEKA 9A153R, FULLRIVER FT61047 and MOTORCRAFT BAGMH3.

This table covers the positive and ground cables that run from the battery. Typical signs include a stretched or frayed cable, or a control that no longer reaches the end of its travel. Route the new cable through the same clips. A kinked cable binds and fails early. Read more

MOTORCRAFT supplies the 11 Battery Cable parts for the 2021 Ford Mustang.

This table covers the Battery Current sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

3 Battery Current Sensor parts are listed for the 2021 Ford Mustang, from DORMAN, STANDARD MOTOR PRODUCTS and WELLS.

Listed part numbers: DORMAN 956135, STANDARD MOTOR PRODUCTS BSC8 and WELLS 5S15941.

This table covers the terminals and clamps that connect cables to the battery posts. Read more

31 Battery Terminal parts for the 2021 Ford Mustang come from MOTORCRAFT. The "Popular" part is MOTORCRAFT WT1002. A list this long means Battery Terminal applications vary by configuration — the notes carry the qualifiers.

This table covers the brackets that mount the Battery Tray. Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners. Read more

This group shows a single part: DORMAN 963249D.

This table covers the Blind Spot Detection sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

One part is listed for the 2021 Ford Mustang — STANDARD MOTOR PRODUCTS BSD144.

This table covers the brackets that mount the Blind Spot Detection Sensor. Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners. Read more

MOTORCRAFT supplies the 5 Blind Spot Detection Sensor Bracket parts for the 2021 Ford Mustang. MOTORCRAFT BSSB21 carries the "Popular" badge.

This group includes MOTORCRAFT BSSB21, MOTORCRAFT BSSB6 and MOTORCRAFT BSSB37 and the remaining parts above.

This table covers the resettable circuit breakers in this vehicle's electrical system. Read more

24 Circuit Breaker parts for the 2021 Ford Mustang come from MOTORCRAFT. The "Popular" part is MOTORCRAFT SW8886.

This table covers the brackets that mount the Engine Control Module (ECM Computer). Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners. Read more

One part is listed for the 2021 Ford Mustang — MOTORCRAFT ECMB5.

This table covers the replacement fuses for this vehicle's fuse boxes. Typical signs include one circuit dead while its neighbor still works, or a fuse that blows again as soon as you replace it. Match amperage and fuse type. A repeat blow means a short — find it before the next fuse. Read more

6 Fuse parts for the 2021 Ford Mustang come from BUSSMANN.

The 150 Amp section lists 1 option from BUSSMANN — grouped under the catalog's "150 Amp" designation — the notes column spells out what sets them apart. BUSSMANN EV20150PX is listed in this group.

The 2 Amp section lists 1 option from BUSSMANN — grouped under the catalog's "2 Amp" designation — the notes column spells out what sets them apart. BUSSMANN ATM2 is listed in this group.

The 20 Amp section lists 1 option from BUSSMANN — grouped under the catalog's "20 Amp" designation — the notes column spells out what sets them apart. BUSSMANN FMS20 is listed in this group.

The 4 Amp section lists 1 option from BUSSMANN — grouped under the catalog's "4 Amp" designation — the notes column spells out what sets them apart. BUSSMANN ATM4 is listed in this group.

The 40 Amp section lists 1 option from BUSSMANN — grouped under the catalog's "40 Amp" designation — the notes column spells out what sets them apart. BUSSMANN FMS40 is listed in this group.

The 60 Amp section lists 1 option from BUSSMANN — grouped under the catalog's "60 Amp" designation — the notes column spells out what sets them apart. BUSSMANN FMS60 is listed in this group.

Part numbers include BUSSMANN EV20150PX, BUSSMANN ATM2 and BUSSMANN FMS20, among others listed above.

This table covers the Fuse Box covers. Read more

2 Fuse Box Cover parts for the 2021 Ford Mustang come from MOTORCRAFT.

Part numbers include MOTORCRAFT HLSC23 and MOTORCRAFT HLSC19.

This table covers the horns mounted in the front of the vehicle. Read more

4 Horn parts for the 2021 Ford Mustang come from 2 brands — MOTORCRAFT and DORMAN.

Part numbers include DORMAN 926568, MOTORCRAFT HRN18 and MOTORCRAFT HRN20, among others listed above.

This table covers the key fobs that lock, unlock and start the vehicle. Read more

DORMAN supplies both parts for the 2021 Ford Mustang.

Part numbers include DORMAN 99287ST and DORMAN 99780ST.

This table covers the modules that control the exterior lighting. Read more

One part is listed for the 2021 Ford Mustang — VEMO V25730208.

This table covers the ultrasonic park-aid sensors in the bumper. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

11 Parking Aid Sensor parts are listed for the 2021 Ford Mustang, from MOTORCRAFT, STANDARD MOTOR PRODUCTS, DORMAN and 2 other brands. STANDARD MOTOR PRODUCTS PPS153 carries the "Popular" badge.

This table covers the brackets that mount the Parking Aid Sensor. Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners. Read more

2 Parking Aid Sensor Bracket parts are listed for the 2021 Ford Mustang, from TECHPRO and VARIOUS MFR.

Part numbers include TECHPRO FO1074100, among others listed above.

This table covers the Rain sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

One part is listed for the 2021 Ford Mustang — MOTORCRAFT WRS4.

This table covers the Reading Lamp wires. Read more

This group shows a single part: MOTORCRAFT WPT1492.

This table covers the speed sensors on the transmission, transfer case or ABS ring. Typical signs include a dead speedometer, harsh transmission shifts, or a code for vehicle speed. Inspect the tone wheel and the connector before replacing the sensor. Read more

15 Speed Sensor parts for the 2021 Ford Mustang come from 4 brands — MOTORCRAFT, STANDARD MOTOR PRODUCTS, DELPHI and 1 other brand. The "Popular" part is MOTORCRAFT DY1506.

This table covers the starter motors that crank the engine. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor. Read more

9 Starter Motor parts are listed for the 2021 Ford Mustang, from MOTORCRAFT, PURE ENERGY, TYC and 4 other brands. MOTORCRAFT SA1088 carries the "Popular" badge.

New: 4 parts, from MOTORCRAFT, TYC and WAI GLOBAL. A representative part number is MOTORCRAFT SA1088.

Remanufactured: 4 parts, from PURE ENERGY, REMY and TERREPOWER. A representative part number is PURE ENERGY 19151.

1 ungrouped part is not assigned to a grade, with the same engine-level match.

This group includes MOTORCRAFT SA1088, TYC 116026 and MOTORCRAFT SA1155 and the remaining parts above.