2021 Ford F-550 Super Duty 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 for the 2021 Ford F-550 Super Duty come from 8 brands — REMY, TERREPOWER, MOTORCRAFT and 5 other brands. The "Popular" part is MOTORCRAFT GL8826.

The New section lists 8 options from MOTORCRAFT, SKP, WAI GLOBAL and 2 other brands — brand-new units rather than rebuilt ones. MOTORCRAFT GL8826 is listed in this group.

The Remanufactured section lists 13 options from FVP, PURE ENERGY, REMY and 2 other brands — factory-rebuilt units with new wear components. FAMOUS BRAND 15098A is listed in this group.

This table covers the brackets that mount the Alternator / Generator. 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: MOTORCRAFT STP368.

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

6 Battery parts are listed for the 2021 Ford F-550 Super Duty, from DEKA, FVP, ACDELCO and 3 other brands. DEKA 9A65 carries the "Popular" badge.

The AGM (Extended Life) section lists 5 options from DEKA, FVP, ACDELCO and 2 other brands — grouped under the catalog's "AGM (Extended Life)" designation — the notes column spells out what sets them apart. DEKA 9A65 is listed in this group.

The Performance AGM (Extended Life + Increased Power) section lists 1 option from FULLRIVER — grouped under the catalog's "Performance AGM (Extended Life + Increased Power)" designation — the notes column spells out what sets them apart. FULLRIVER FT93065 is listed in this group.

Listed part numbers: DEKA 9A65, FVP P65AGM and ACDELCO 65AGMHRC, plus the other parts above.

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

This group shows a single part: MOTORCRAFT WC97737.

This table covers the clamps and brackets that secure the battery. Read more

3 Battery Hold Down parts for the 2021 Ford F-550 Super Duty come from 3 brands — AUTOTECNICA, DORMAN and SKP.

Part numbers include AUTOTECNICA FD0820716, DORMAN 60330 and SKP SK60330.

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

MOTORCRAFT supplies the 16 Battery Terminal parts for the 2021 Ford F-550 Super Duty. MOTORCRAFT WT1002 carries the "Popular" badge.

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

MOTORCRAFT supplies the 13 Circuit Breaker parts for the 2021 Ford F-550 Super Duty. MOTORCRAFT SW8879 carries the "Popular" badge.

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

This group shows a single part: MOTORCRAFT ECMB7.

This table covers the fuse blocks that hold this vehicle's fuses. Read more

3 Fuse Block parts for the 2021 Ford F-550 Super Duty come from 2 brands — DORMAN and BUSSMANN.

Part numbers include BUSSMANN MUSBT5, DORMAN 956144 and DORMAN 956146.

This table covers the Fuse boxes. Read more

This group shows a single part: MOTORCRAFT HLS1.

This table covers the Fuse Box covers. Read more

5 Fuse Box Cover parts are listed for the 2021 Ford F-550 Super Duty, from MOTORCRAFT and DORMAN. MOTORCRAFT HLSC15 carries the "Popular" badge.

This group includes MOTORCRAFT HLSC15, DORMAN 956148 and MOTORCRAFT HLSC13 and the remaining parts above.

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

One part is listed for the 2021 Ford F-550 Super Duty — MOTORCRAFT HRN2.

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

3 Keyless Entry Remote parts for the 2021 Ford F-550 Super Duty come from DORMAN.

Listed part numbers: DORMAN 99294ST, DORMAN 99284ST and DORMAN 99778ST.

This table covers the replacement shells for the key fob. Read more

This group shows a single part: DORMAN 95351.

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

This group shows a single part: STANDARD MOTOR PRODUCTS PPS157.

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

This group shows a single part: MOTORCRAFT WRS5.

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

5 Speed Sensor parts are listed for the 2021 Ford F-550 Super Duty, from MOTORCRAFT and STANDARD MOTOR PRODUCTS. MOTORCRAFT DY1520 carries the "Popular" badge.

Listed part numbers: MOTORCRAFT DY1520, MOTORCRAFT DY1517 and MOTORCRAFT DY1372, plus the other parts above.

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

12 Starter Motor parts for the 2021 Ford F-550 Super Duty come from 7 brands — PURE ENERGY, REMY, FVP and 4 other brands. The "Popular" part is MOTORCRAFT SA1227.

The New section: 6 options from MOTORCRAFT, PURE ENERGY, REMY and 3 other brands. MOTORCRAFT SA1227 is listed in this group.

The Remanufactured section: 6 options from ACDELCO, FVP, PURE ENERGY and 3 other brands. ACDELCO 3362245A is listed in this group.

This table covers the Starter solenoids. Typical signs include a harsh or missing shift, or a code for this solenoid circuit. Check resistance and the connector before dropping the pan for a solenoid. Read more

This group shows a single part: MOTORCRAFT SW9188.

This table covers the Yaw 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 F-550 Super Duty — MOTORCRAFT SW9354.