This page lists 87 electrical bulb & socket parts for the 2018 Ram 4500, across 17 part types, covering both the 6.4L V8 and the 6.7L L6 DIESEL Turbocharged. Every part shows its brand, manufacturer part number and fitment notes.
On the 2018 Ram 4500, the bulb and socket system covers every bulb and socket on the vehicle, from headlamps to instrument-cluster illumination. 35 parts of the 87 listed are Headlamp Bulb (13 parts), Fog / Driving Lamp Bulb (11 parts) and Headlamp Socket (11 parts). The other 14 part types cover the remaining 52 parts.
The 2018 Ram 4500 was sold with both the 6.4L V8 and the 6.7L L6 DIESEL Turbocharged. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
12 brands supply electrical bulb & socket parts for the 2018 Ram 4500, led by WAGNER (40 parts), HELLA (20 parts) and PHILIPS (6 parts), plus 9 more brands. Quality grades include Standard Replacement, Extended Life and LED.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2018 Ram 4500. 20 parts have it, including HELLA 921 (Brake Light Bulb - High Mount) and WAGNER 9006BLX (Fog / Driving Lamp Bulb). Each part number opens a page with every vehicle that part fits.
Back Up / Reverse Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 6.4L V8 | 3157NA | 🇺🇸 US 🇨🇦 CA | IncandescentNatural Amber | View on Amazon |
| PEAK Fits: 6.4L V8 | 7440 | 🇺🇸 US 🇨🇦 CA | Backup LightBulb | View on Amazon |
This table covers the bulbs in the reverse lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
2 Back Up / Reverse Lamp Bulb parts for the 2018 Ram 4500 come from 2 brands — HELLA and PEAK.
This group includes HELLA 3157NA and PEAK 7440.
Brake Light Bulb - High Mount
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 6.4L V8 | 921LL | 🇺🇸 US 🇨🇦 CA | IncandescentLong Life | View on Amazon |
| HELLA Fits: 6.4L V8 | DE3175LL | 🇺🇸 US 🇨🇦 CA | IncandescentLong Life | View on Amazon |
| WAGNER Fits: 6.4L V8 | 921LL | 🇺🇸 US 🇨🇦 CA | Long LifeWedge Base | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular Fits: 6.4L V8 | 921 | 🇺🇸 US 🇨🇦 CA | IncandescentSocket Type Bulb: W2.1x9.5d | View on Amazon |
| WAGNER Popular Fits: 6.4L V8 | 921 | 🇺🇸 US 🇨🇦 CA | Bulb Type: T-5 Bulb 5/8 (16mm) DiameterVoltage: 12.800 Volts (Direct Current) | View on Amazon |
| HELLA Fits: 6.4L V8 | 921NA | 🇺🇸 US 🇨🇦 CA | IncandescentNatural Amber | View on Amazon |
This table covers the bulbs in the high-mount stop lamp. Typical signs include a clunk on takeoff, a vibration at idle, or a separated rubber insert. Support the powertrain before unbolting a mount, and torque the fasteners in the notes.
6 Brake Light Bulb - High Mount parts for the 2018 Ram 4500 come from 2 brands — HELLA and WAGNER. The "Popular" part is HELLA 921.
In the Extended Life grade, HELLA and WAGNER supply 3 parts: grouped under the catalog's "Extended Life" designation — the notes column spells out what sets them apart. A representative part number is HELLA 921LL.
In the Standard Replacement grade, HELLA and WAGNER supply 3 parts: built to original-equipment specification. A representative part number is HELLA 921.
This group includes HELLA 921, HELLA 921LL and HELLA DE3175LL and the remaining parts above.
Engine Compartment Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.4L V8 | 561LL | 🇺🇸 US 🇨🇦 CA | Long LifeRigid Loop Base | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS Fits: 6.4L V8 | 561 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WAGNER Fits: 6.4L V8 | 561 | 🇺🇸 US 🇨🇦 CA | Rigid Loop Base12.420 Watt | View on Amazon |
This table covers the replacement bulbs for the Engine Compartment Light. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
3 Engine Compartment Light Bulb parts are listed for the 2018 Ram 4500, from WAGNER and PHILIPS.
The Extended Life section: 1 option from WAGNER. WAGNER 561LL is listed in this group.
The Standard Replacement section: 2 options from PHILIPS and WAGNER. PHILIPS 561 is listed in this group.
Part numbers include WAGNER 561LL and PHILIPS 561, among others listed above.
Fog / Driving Lamp Bulb
Extra Bright (improved visibility, but shorter life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Popular Fits: 6.4L V8 | 9006BLX | 🇺🇸 US 🇨🇦 CA | P22D Base55.000 Watt | View on Amazon |
| PHILIPS Fits: 6.4L V8 | 9145CVP | 🇺🇸 US 🇨🇦 CA | Crystal Vision PlatinumUp to 60% More Light | View on Amazon |
| WAGNER Fits: 6.4L V8 | 9006TVX | 🇺🇸 US 🇨🇦 CA | P22D Base55.000 Watt | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS Fits: 6.4L V8 | 9145USLED | 🇺🇸 US 🇨🇦 CA | Ultinon Sport LED | View on Amazon |
| WAGNER Fits: 6.4L V8 | 9145LED | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
| WAGNER Fits: 6.4L V8 | 9006LED | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular Fits: 6.4L V8 | 9006 | 🇺🇸 US 🇨🇦 CA | HalogenSocket Type Bulb: P22D or Socket Type Bulb: PG13 | View on Amazon |
| WAGNER Popular Fits: 6.4L V8 | 9006 | 🇺🇸 US 🇨🇦 CA | Voltage: 12.800 Volts (Direct Current)Right Angle Special Base | View on Amazon |
| GM GENUINE Fits: 6.4L V8 | 9006 | 🇺🇸 US 🇨🇦 CA | 2 Prong Connector | View on Amazon |
| PHILIPS Fits: 6.4L V8 | 9145H | 🇺🇸 US 🇨🇦 CA | Frontwithout Projector-Type Headlamps Horizontal Fog Lamps | View on Amazon |
| WAGNER Fits: 6.4L V8 | 9145 | 🇺🇸 US 🇨🇦 CA | Frontwith Horizontal Fog Lights | View on Amazon |
This table covers the bulbs in the fog and driving lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
11 Fog / Driving Lamp Bulb parts are listed for the 2018 Ram 4500, from WAGNER, PHILIPS, HELLA and 1 other brand. WAGNER 9006BLX carries the "Popular" badge.
The Extra Bright (improved visibility, but shorter life) section lists 3 options from WAGNER and PHILIPS — grouped under the catalog's "Extra Bright (improved visibility, but shorter life)" designation — the notes column spells out what sets them apart. WAGNER 9006BLX is listed in this group.
In the LED (instant-on, long life, energy-saving) grade, WAGNER and PHILIPS supply 3 parts: grouped under the catalog's "LED (instant-on, long life, energy-saving)" designation — the notes column spells out what sets them apart. A representative part number is PHILIPS 9145USLED.
The Standard Replacement section: 5 options from WAGNER, HELLA, GM GENUINE and 1 other brand. HELLA 9006 is listed in this group.
Glove Box Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 6.4L V8 | 194LL | 🇺🇸 US 🇨🇦 CA | IncandescentLong Life | View on Amazon |
| WAGNER Fits: 6.4L V8 | 194LL | 🇺🇸 US 🇨🇦 CA | Long LifeBulb Type: T-3-1/4 Bulb 13/32 (10mm) Diameter | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.4L V8 | T10LED | 🇺🇸 US 🇨🇦 CA | Tru View PLUS LED | View on Amazon |
| WAGNER Fits: 6.4L V8 | 194LEDW | 🇺🇸 US 🇨🇦 CA | LEDGlass:Clear (T3-1/4), Number of Filaments:1, Watts:3.78 (0.16 cp), Base:Wedge (W2.1x9.5d) | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular Fits: 6.4L V8 | 194 | 🇺🇸 US 🇨🇦 CA | Brightness: 2.0 CPIncandescent | View on Amazon |
| WAGNER Popular Fits: 6.4L V8 | 194 | 🇺🇸 US 🇨🇦 CA | Wedge Base3.780 Watt | View on Amazon |
This table covers the bulbs in the glove-box lamp. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
6 Glove Box Light Bulb parts are listed for the 2018 Ram 4500, from WAGNER and HELLA. HELLA 194 carries the "Popular" badge.
The Extended Life section: 2 options from HELLA and WAGNER. HELLA 194LL is listed in this group.
LED (instant-on, long life, energy-saving): 2 parts, from WAGNER. A representative part number is WAGNER T10LED.
The Standard Replacement section: 2 options from HELLA and WAGNER. HELLA 194 is listed in this group.
Part numbers include HELLA 194, HELLA 194LL and WAGNER T10LED, among others listed above.
Headlamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOPAR Fits: 6.4L V8 | L0009012LL | 🇺🇸 US 🇨🇦 CA | 9012LL | View on Amazon |
| WAGNER Fits: 6.4L V8 | 1255H11LL | 🇺🇸 US 🇨🇦 CA | Long Life | View on Amazon |
Extra Bright (improved visibility, but shorter life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.4L V8 | 9005TVX | 🇺🇸 US 🇨🇦 CA | HID Look | View on Amazon |
| WAGNER Fits: 6.4L V8 | 9005BLX | 🇺🇸 US 🇨🇦 CA | Long Life80% More Light | View on Amazon |
| WAGNER Fits: 6.4L V8 | H11BLX | 🇺🇸 US 🇨🇦 CA | BritelitePGJ19-2 Base | View on Amazon |
| WAGNER Fits: 6.4L V8 | H11TVX | 🇺🇸 US 🇨🇦 CA | Truview Plus1.733 Base | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular Fits: 6.4L V8 | 9005 | 🇺🇸 US 🇨🇦 CA | HalogenSocket Type Bulb: P20D | View on Amazon |
| WAGNER Popular Fits: 6.4L V8 | 9005 | 🇺🇸 US 🇨🇦 CA | Voltage: 12.800 Volts (Direct Current) | View on Amazon |
| WAGNER Popular Fits: 6.4L V8 | 1255H11 | 🇺🇸 US 🇨🇦 CA | Bulb Color: Clear | View on Amazon |
| HELLA Fits: 6.4L V8 | H11 | 🇺🇸 US 🇨🇦 CA | HalogenSocket Type Bulb: PGJ19-2 or Socket Type Bulb: PGJY19-2 | View on Amazon |
| MOPAR Fits: 6.4L V8 | L09005HL | 🇺🇸 US 🇨🇦 CA | 9005 | View on Amazon |
| MOPAR Fits: 6.4L V8 | 68604860AA | 🇺🇸 US 🇨🇦 CA | Fits RightHalogen Quad Headlamps | View on Amazon |
| WAGNER Fits: 6.4L V8 | 9005L | 🇺🇸 US 🇨🇦 CA | Long Life | View on Amazon |
This table covers the bulbs that light the headlamps. Typical signs include a dark lamp, a flicker over bumps, or a bulb that keeps failing on one side. Avoid touching a halogen capsule. Repeated failure in one socket is usually the socket or ground, not the bulb.
13 Headlamp Bulb parts are listed for the 2018 Ram 4500, from WAGNER, MOPAR and HELLA. HELLA 9005 carries the "Popular" badge.
The Extended Life section: 2 options from MOPAR and WAGNER. MOPAR L0009012LL is listed in this group.
The Extra Bright (improved visibility, but shorter life) section: 4 options from WAGNER. WAGNER 9005TVX is listed in this group.
The Standard Replacement section: 7 options from WAGNER, HELLA and MOPAR. HELLA 9005 is listed in this group.
Headlamp Socket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: 6.4L V8 | HP3835 | 🇺🇸 US 🇨🇦 CA | HandypackConnector Shape: Oval | View on Amazon |
| STANDARD MOTOR PRODUCTS Popular Fits: 6.4L V8 | S553 | 🇺🇸 US 🇨🇦 CA | Connector Shape: OvalContact Terminal Material: Metal | View on Amazon |
| WELLS Popular Fits: 6.4L V8 | 1P1032 | 🇺🇸 US 🇨🇦 CA | Fits without Projector HeadlightsLow Beamor Low Beam | View on Amazon |
| ACDELCO Fits: 6.4L V8 | LS255 | 🇺🇸 US 🇨🇦 CA | Gold | View on Amazon |
| ACDELCO Fits: 6.4L V8 | PT2298 | 🇺🇸 US 🇨🇦 CA | GoldHeight (In): 1.5 in | View on Amazon |
| ROSTRA Fits: 6.4L V8 | 610004 | 🇺🇸 US 🇨🇦 CA | Low Beam | View on Amazon |
| ROSTRA Fits: 6.4L V8 | 610023 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: 6.4L V8 | HP3970 | 🇺🇸 US 🇨🇦 CA | Handypack | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 6.4L V8 | S524 | 🇺🇸 US 🇨🇦 CA | Weather Resistant: YES | View on Amazon |
| WALKER PRODUCTS Fits: 6.4L V8 | 2701125 | 🇺🇸 US 🇨🇦 CA | Fits High Beamor with Projector HeadlightsLow Beam | View on Amazon |
| WELLS Fits: 6.4L V8 | 6S1047 | 🇺🇸 US 🇨🇦 CA | Gender: MaleWire Gauge Measurement: 18 | View on Amazon |
This table covers the sockets that hold a headlamp bulb in the housing. Typical signs include a flicker over bumps, melted plastic, or a bulb that will not stay seated. Dielectric grease on the contacts slows corrosion. Do not force a bulb into a heat-damaged socket.
11 Headlamp Socket parts are listed for the 2018 Ram 4500, from STANDARD MOTOR PRODUCTS, WELLS, ACDELCO and 2 other brands. STANDARD MOTOR PRODUCTS HP3835 carries the "Popular" badge.
LED Bulb Adapter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.4L V8 | CB900590069012 | 🇺🇸 US 🇨🇦 CA | LEDFor 9005 / 9006 / 9012 Bulb | View on Amazon |
| WAGNER Fits: 6.4L V8 | CBH8H11H16 | 🇺🇸 US 🇨🇦 CA | For H8 / H11 / H16 Bulb | View on Amazon |
This table covers the LED Bulb adapters.
WAGNER supplies both parts for the 2018 Ram 4500.
Listed part numbers: WAGNER CB900590069012 and WAGNER CBH8H11H16.
License Plate Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PEAK Fits: 6.4L V8 | 194 | 🇺🇸 US 🇨🇦 CA | License Plate LightBulb | View on Amazon |
This table covers the bulbs that light the license plate. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
This group shows a single part: PEAK 194.
Map / Reading Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS Fits: 6.4L V8 | 578LL | 🇺🇸 US 🇨🇦 CA | Longer Life | View on Amazon |
| WAGNER Fits: 6.4L V8 | 578LL | 🇺🇸 US 🇨🇦 CA | Long LifeDouble End Caps Base | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.4L V8 | 578 | 🇺🇸 US 🇨🇦 CA | Double End Caps Base9.980 Watt | View on Amazon |
This table covers the bulbs in the map / reading lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
3 Map / Reading Light Bulb parts for the 2018 Ram 4500 come from 2 brands — WAGNER and PHILIPS.
Extended Life: 2 parts, from PHILIPS and WAGNER. A representative part number is PHILIPS 578LL.
Standard Replacement: 1 part, from WAGNER. A representative part number is WAGNER 578.
Listed part numbers: PHILIPS 578LL and WAGNER 578, plus the other parts above.
Parking Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 6.4L V8 | 4157NALL | 🇺🇸 US 🇨🇦 CA | IncandescentLong Life | View on Amazon |
| WAGNER Fits: 6.4L V8 | 3157NALL | 🇺🇸 US 🇨🇦 CA | Long LifeNatural Amber | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PILOT AUTOMOTIVE Fits: 6.4L V8 | IL3157R15WK | 🇺🇸 US 🇨🇦 CA | Fits Parking Lightwithout PROJECTOR-TYPE HEADLAMPS | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Popular Fits: 6.4L V8 | 3157NA | 🇺🇸 US 🇨🇦 CA | Natural AmberDouble Contact Wedge Base | View on Amazon |
| HELLA Fits: 6.4L V8 | 3157NA | 🇺🇸 US 🇨🇦 CA | IncandescentNatural Amber | View on Amazon |
This table covers the bulbs in the parking lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
5 Parking Lamp Bulb parts are listed for the 2018 Ram 4500, from HELLA, WAGNER and PILOT AUTOMOTIVE. WAGNER 3157NA carries the "Popular" badge.
The Extended Life section: 2 options from HELLA and WAGNER. HELLA 4157NALL is listed in this group.
LED (instant-on, long life, energy-saving): 1 part, from PILOT AUTOMOTIVE. A representative part number is PILOT AUTOMOTIVE IL3157R15WK.
The Standard Replacement section: 2 options from WAGNER and HELLA. WAGNER 3157NA is listed in this group.
Part numbers include WAGNER 3157NA, HELLA 4157NALL and WAGNER 3157NALL, among others listed above.
Roof Marker & Identification Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 6.4L V8 | 194LL | 🇺🇸 US 🇨🇦 CA | IncandescentLong Life | View on Amazon |
| PHILIPS Fits: 6.4L V8 | 194NALL | 🇺🇸 US 🇨🇦 CA | Longer LifeNatural Amber | View on Amazon |
| WAGNER Fits: 6.4L V8 | 194NALL | 🇺🇸 US 🇨🇦 CA | Long LifeNatural Amber | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.4L V8 | 194NALED | 🇺🇸 US 🇨🇦 CA | LEDNatural Amber | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular Fits: 6.4L V8 | 194 | 🇺🇸 US 🇨🇦 CA | Brightness: 2.0 CPIncandescent | View on Amazon |
| WAGNER Popular Fits: 6.4L V8 | 194NA | 🇺🇸 US 🇨🇦 CA | Natural AmberWedge Base | View on Amazon |
This table covers the replacement bulbs for the Roof Marker & Identification Light. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
6 Roof Marker & Identification Light Bulb parts are listed for the 2018 Ram 4500, from WAGNER, HELLA and PHILIPS. HELLA 194 carries the "Popular" badge.
The Extended Life section: 3 options from HELLA, PHILIPS and WAGNER. HELLA 194LL is listed in this group.
LED (instant-on, long life, energy-saving): 1 part, from WAGNER. A representative part number is WAGNER 194NALED.
The Standard Replacement section: 2 options from HELLA and WAGNER. HELLA 194 is listed in this group.
Part numbers include HELLA 194, HELLA 194LL and PHILIPS 194NALL, among others listed above.
Side Marker Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 6.4L V8 | 3157LL | 🇺🇸 US 🇨🇦 CA | Incandescent27/8W | View on Amazon |
| WAGNER Fits: 6.4L V8 | 3157NALL | 🇺🇸 US 🇨🇦 CA | Long LifeNatural Amber | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular Fits: 6.4L V8 | 3157 | 🇺🇸 US 🇨🇦 CA | Incandescent27/7W | View on Amazon |
| WAGNER Fits: 6.4L V8 | 3157NA | 🇺🇸 US 🇨🇦 CA | Natural AmberDouble Contact Wedge Base | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PEAK Fits: 6.4L V8 | 3157NA | 🇺🇸 US 🇨🇦 CA | Frontwithout Projector-Type Headlamps | View on Amazon |
This table covers the bulbs in the side-marker lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
5 Side Marker Light Bulb parts for the 2018 Ram 4500 come from 3 brands — HELLA, WAGNER and PEAK. The "Popular" part is HELLA 3157.
Extended Life: 2 parts, from HELLA and WAGNER. A representative part number is HELLA 3157LL.
Standard Replacement: 2 parts, from HELLA and WAGNER. A representative part number is HELLA 3157.
1 further part sits outside the graded sections, with the same engine-level match.
This group includes HELLA 3157, HELLA 3157LL and WAGNER 3157NALL and the remaining parts above.
Tail Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.4L V8 | 3157RLED | 🇺🇸 US 🇨🇦 CA | RedLED | View on Amazon |
This table covers the bulbs in the tail lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
One part is listed for the 2018 Ram 4500 — WAGNER 3157RLED.
Tail Lamp Socket / Connector Plate
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 6.4L V8 | 1P3339 | 🇺🇸 US 🇨🇦 CA | with Bulb # 3157 | View on Amazon |
This table covers the Tail Lamp Socket / Connector plates. Typical signs include warpage, cracks, or a plate that no longer locates the assembly. Confirm which plate the notes describe — backing plates, clutch plates and strike plates are different parts.
One part is listed for the 2018 Ram 4500 — WELLS 1P3339.
Trunk / Cargo Area Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 6.4L V8 | 921LL | 🇺🇸 US 🇨🇦 CA | IncandescentLong Life | View on Amazon |
| WAGNER Fits: 6.4L V8 | 921LL | 🇺🇸 US 🇨🇦 CA | Long LifeWedge Base | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.4L V8 | 921WLED | 🇺🇸 US 🇨🇦 CA | LEDWhite | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular Fits: 6.4L V8 | 921 | 🇺🇸 US 🇨🇦 CA | IncandescentSocket Type Bulb: W2.1x9.5d | View on Amazon |
| WAGNER Fits: 6.4L V8 | 921 | 🇺🇸 US 🇨🇦 CA | Bulb Type: T-5 Bulb 5/8 (16mm) DiameterVoltage: 12.800 Volts (Direct Current) | View on Amazon |
This table covers the bulbs in the trunk or cargo-area lamp. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
5 Trunk / Cargo Area Light Bulb parts are listed for the 2018 Ram 4500, from WAGNER and HELLA. HELLA 921 carries the "Popular" badge.
The Extended Life section: 2 options from HELLA and WAGNER. HELLA 921LL is listed in this group.
LED (instant-on, long life, energy-saving): 1 part, from WAGNER. A representative part number is WAGNER 921WLED.
The Standard Replacement section: 2 options from HELLA and WAGNER. HELLA 921 is listed in this group.
This group includes HELLA 921, HELLA 921LL and WAGNER 921WLED and the remaining parts above.
Turn Signal Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 6.4L V8 | 3157LL | 🇺🇸 US 🇨🇦 CA | Incandescent27/8W | View on Amazon |
| WAGNER Fits: 6.4L V8 | 3157NALL | 🇺🇸 US 🇨🇦 CA | Long LifeNatural Amber | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PILOT AUTOMOTIVE Fits: 6.4L V8 | IL3157R15WK | 🇺🇸 US 🇨🇦 CA | FrontULTINON LED | View on Amazon |
| WAGNER Fits: 6.4L V8 | 3157NALED | 🇺🇸 US 🇨🇦 CA | LEDNatural Amber | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular Fits: 6.4L V8 | 3157 | 🇺🇸 US 🇨🇦 CA | Incandescent27/7W | View on Amazon |
| WAGNER Popular Fits: 6.4L V8 | 3157NA | 🇺🇸 US 🇨🇦 CA | Natural AmberDouble Contact Wedge Base | View on Amazon |
This table covers the bulbs in the turn-signal lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
6 Turn Signal Lamp Bulb parts for the 2018 Ram 4500 come from 3 brands — WAGNER, HELLA and PILOT AUTOMOTIVE. The "Popular" part is HELLA 3157.
Extended Life: 2 parts, from HELLA and WAGNER. A representative part number is HELLA 3157LL.
The LED (instant-on, long life, energy-saving) section: 2 options from PILOT AUTOMOTIVE and WAGNER. PILOT AUTOMOTIVE IL3157R15WK is listed in this group.
Standard Replacement: 2 parts, from HELLA and WAGNER. A representative part number is HELLA 3157.
This group includes HELLA 3157, HELLA 3157LL and WAGNER 3157NALL and the remaining parts above.
Buying Electrical Bulb & Socket Parts for a 2018 Ram 4500
On this vehicle, the bulb and socket system covers every bulb and socket on the vehicle, from headlamps to instrument-cluster illumination.
- Match the engine first. Every electrical bulb & socket part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace bulbs in pairs so both sides age together, and put a smear of dielectric grease on the new socket contacts.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Headlamp Bulb and Fog / Driving Lamp Bulb .
Frequently Asked Questions
How many electrical bulb & socket parts fit the 2018 Ram 4500?
Our catalog currently lists 87 electrical bulb & socket parts for the 2018 Ram 4500 across 17 subcategories and 12 brands, covering both the 6.4L V8 and the 6.7L L6 DIESEL Turbocharged. Each part is matched to the engine(s) it fits.
Do electrical bulb & socket parts differ between 2018 Ram 4500 engines?
Yes. Every electrical bulb & socket part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of electrical bulb & socket problems on a 2018 Ram 4500?
Common symptoms include a lamp that flickers over bumps, melted or discolored socket plastic, or bulbs that keep failing early on one side. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace bulbs in pairs so both sides age together, and put a smear of dielectric grease on the new socket contacts.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2018 Ram 4500 was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2018 Ram 4500?
First match the engine — each row shows which engine(s) the part fits. Then repeated bulb failure in one position usually means a socket or ground problem, not bad bulbs — replace the socket rather than chase it. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2018 Ram 4500
Electrical Bulb & Socket Parts for Other Ram 4500 Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.