2021 Ram 4500 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

51 Alternator / Generator parts for the 2021 Ram 4500 come from 11 brands — REMY, TERREPOWER, PURE ENERGY and 8 other brands. The "Popular" part is MOPAR 4801769AB. New and Remanufactured are all represented, and Remanufactured alone accounts for 29 parts.

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

One part is listed for the 2021 Ram 4500 — DORMAN 300435.

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

7 Battery parts are listed for the 2021 Ram 4500, from DEKA, ACDELCO, BOSCH and 3 other brands. DEKA 9A48 carries the "Popular" badge. All of them fit every engine offered in the 2021 4500.

The AGM (Extended Life) section lists 6 options from DEKA, ACDELCO, BOSCH and 2 other brands — grouped under the catalog's "AGM (Extended Life)" designation — the notes column spells out what sets them apart. DEKA 9A48 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 FT85094R is listed in this group.

This group includes DEKA 9A48, DEKA 9A94R and ACDELCO 94RAGM and the remaining 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

7 Battery Cable parts for the 2021 Ram 4500 come from MOPAR. 1 part fits every engine; the other 6 are engine-specific.

Part numbers include MOPAR 68606646AA, MOPAR 5032359AC and MOPAR 68092086AA, among others listed above.

This table covers the Battery covers. Read more

2 Battery Cover parts for the 2021 Ram 4500 come from MOPAR. 1 part fits every engine; the other 1 is engine-specific.

This group includes MOPAR 68497403AA and MOPAR 68497402AA.

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

This group shows a single part: MOPAR 68370876AB.

This table covers the Battery Heat shields. Typical signs include a bent shield rubbing a rotor, or rust-through that leaves the backing open. A rubbing shield will eat a new rotor. Straighten or replace it before the wheel goes back on. Read more

This group shows a single part: MOPAR 68494324AA.

This table covers the trays the battery sits in. Read more

One part is listed for the 2021 Ram 4500 — MOPAR 68673610AA.

This table covers the Door control modules. Read more

MOPAR supplies the 4 Door Control Module parts for the 2021 Ram 4500. All of them fit every engine offered in the 2021 4500.

Listed part numbers: MOPAR 68374088AG, MOPAR 68374089AG and MOPAR 68374090AG, plus the other parts above.

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: MOPAR 68447687AA.

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

MOPAR supplies the 9 Fuse parts for the 2021 Ram 4500. MOPAR 68241002AA carries the "Popular" badge. 4 parts fit every engine; the other 5 are engine-specific.

In the 20 Amp grade, MOPAR supplies 2 parts: grouped under the catalog's "20 Amp" designation — the notes column spells out what sets them apart. A representative part number is MOPAR 68202896AA.

The 250 Amp section lists 1 option from MOPAR — grouped under the catalog's "250 Amp" designation — the notes column spells out what sets them apart. MOPAR 68241002AA is listed in this group.

The 30 Amp section lists 2 options from MOPAR — grouped under the catalog's "30 Amp" designation — the notes column spells out what sets them apart. MOPAR 68144653AA is listed in this group.

In the 40 Amp grade, MOPAR supplies 1 part: grouped under the catalog's "40 Amp" designation — the notes column spells out what sets them apart. A representative part number is MOPAR 68144445AA.

The 5 Amp section lists 1 option from MOPAR — grouped under the catalog's "5 Amp" designation — the notes column spells out what sets them apart. MOPAR 68202832AB is listed in this group.

The 50 Amp section lists 1 option from MOPAR — grouped under the catalog's "50 Amp" designation — the notes column spells out what sets them apart. MOPAR 68144446AA is listed in this group.

In the 60 Amp grade, MOPAR supplies 1 part: grouped under the catalog's "60 Amp" designation — the notes column spells out what sets them apart. A representative part number is MOPAR 68144447AA.

Part numbers include MOPAR 68241002AA, MOPAR 68202896AA and MOPAR 68144442AA, among others listed above.

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

3 Fuse Block parts for the 2021 Ram 4500 come from 2 brands — MOPAR and DORMAN. 1 part fits every engine; the other 2 are engine-specific.

Part numbers include DORMAN 956356, MOPAR 68437288AB and MOPAR 68437289AB.

This table covers the Fuse Box covers. Read more

One part is listed for the 2021 Ram 4500 — MOPAR 68202821AA.

This table covers the HID Lighting ballasts. Read more

This group shows a single part: MOPAR 68448765AA.

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

One part is listed for the 2021 Ram 4500 — MOPAR 68297891AC.

This table covers the receivers that pick up the key-fob unlock signal. Read more

2 Keyless Entry Module / Receiver parts for the 2021 Ram 4500 come from MOPAR. Every part fits both the 6.4L V8 and the 6.7L L6 DIESEL Turbocharged.

Part numbers include MOPAR 56046957AA and MOPAR 56046958AA.

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

5 Keyless Entry Remote parts for the 2021 Ram 4500 come from MOPAR. Every part fits both the 6.4L V8 and the 6.7L L6 DIESEL Turbocharged.

Part numbers include MOPAR 68538047AB, MOPAR 68538048AB and MOPAR 68538049AB, among others listed above.

This table covers the Lane Departure Camera modules. Typical signs include a cluster of unrelated faults, a no-communication code, or a module that will not sleep. Confirm power, ground and programming compatibility in the notes. Modules are rarely plug-and-play across years. Read more

This group shows a single part: STANDARD MOTOR PRODUCTS LDS60.

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

4 Parking Aid Sensor parts for the 2021 Ram 4500 come from 2 brands — DORMAN and STANDARD MOTOR PRODUCTS. Every part fits both the 6.4L V8 and the 6.7L L6 DIESEL Turbocharged.

Part numbers include DORMAN 684102, DORMAN 684126 and STANDARD MOTOR PRODUCTS PPS110, 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

2 Rain Sensor parts for the 2021 Ram 4500 come from MOPAR. Every part fits both the 6.4L V8 and the 6.7L L6 DIESEL Turbocharged.

Listed part numbers: MOPAR 68298334AA and MOPAR 68298468AA.

This table covers the Serial Data Gateway modules. Typical signs include a cluster of unrelated faults, a no-communication code, or a module that will not sleep. Confirm power, ground and programming compatibility in the notes. Modules are rarely plug-and-play across years. Read more

2 Serial Data Gateway Module parts for the 2021 Ram 4500 come from MOPAR. Every part fits both the 6.4L V8 and the 6.7L L6 DIESEL Turbocharged.

Part numbers include MOPAR 68454413AA and MOPAR 68404893AB.

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

4 Speed Sensor parts are listed for the 2021 Ram 4500, from MOPAR, BECK/ARNLEY and STANDARD MOTOR PRODUCTS. 3 parts fit every engine; the other 1 is engine-specific.

In the Economy grade, BECK/ARNLEY supplies 1 part: the catalog's value-priced group. A representative part number is BECK/ARNLEY 0900013.

The Standard Replacement section lists 3 options from MOPAR and STANDARD MOTOR PRODUCTS — built to original-equipment specification. MOPAR 68244169AA is listed in this group.

Part numbers include BECK/ARNLEY 0900013, MOPAR 68244169AA and MOPAR 68020003AA, among others listed 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

13 Starter Motor parts for the 2021 Ram 4500 come from 6 brands — MOPAR, WAI GLOBAL, PURE ENERGY and 3 other brands. The "Popular" part is WAI GLOBAL 19971N.

The New section lists 3 options from WAI GLOBAL and MOPAR — brand-new units rather than rebuilt ones. WAI GLOBAL 19971N is listed in this group.

The Remanufactured section lists 10 options from PURE ENERGY, REMY, FVP and 2 other brands — factory-rebuilt units with new wear components. PURE ENERGY 19971 is listed in this group.

This table covers the Starter Motor Heat shields. Typical signs include a bent shield rubbing a rotor, or rust-through that leaves the backing open. A rubbing shield will eat a new rotor. Straighten or replace it before the wheel goes back on. Read more

One part is listed for the 2021 Ram 4500 — MOPAR 68371509AA.