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When upgrading the lights on a fourth-generation Dodge Ram 1500, one of the most common mistakes is choosing replacement bulbs based only on the model year. Even among 2016, 2017, and 2018 models, different trucks may use different low-beam, fog light, and reverse light bulbs.
This is because the 2016–2018 Ram 1500 was offered with different headlight, fog light, and rear light configurations across trims such as Tradesman, Express, SLT, Big Horn, Lone Star, Sport, Night, Rebel, Laramie, Laramie Longhorn, and Limited.
This 2016–2018 Ram 1500 bulb size guide will help you:
- Identify projector or quad reflector headlights
- Tell vertical fog lights from horizontal fog lights
- Find low-beam, high-beam, fog light, reverse light, and other bulb sizes
- Understand CANbus warnings, flicker, dust cover clearance, and beam pattern issues
- Choose suitable SEALIGHT LED bulbs for Ram 1500
Why Do 2016–2018 Ram 1500 Bulb Sizes Vary?
Many owners searching for a 2016–2018 Ram 1500 bulb size notice that:
- Some trucks use a 9005 low-beam bulb, while others use H11
- Some fog lights use 9006, while others use 9145
- Some reverse lights use 921, while others use 7440/W21W
These differences are not determined by the model year alone. They depend on the actual factory lighting configuration installed on the truck. The main differences on a 2016–2018 Ram 1500 include:
| Configuration Difference | Available Types | Bulbs Affected |
|---|---|---|
| Headlights | Projector or quad reflector headlights | Low beam and front turn signal |
| Fog lights | Vertical or horizontal fog lights | Fog light bulb |
| Rear lights | Base rear lights or premium LED rear lights | Reverse, tail, brake, and rear turn signal bulbs |
The correct process is simple: identify the light type first, then find the bulb size.
How to Identify Your Ram 1500 Headlight and Fog Light Type
Before searching for a 2016 Ram 1500 headlight bulb size or 2017 Ram 1500 fog light bulb size, inspect the lights at the front of the truck.
Projector vs. Quad Reflector Headlights
| Headlight Type | Visual Features | Low Beam | High Beam | Front Turn Signal |
|---|---|---|---|---|
| Projector Headlights | A visible round projector lens inside the low-beam area, similar to a camera lens | 9005, factory 9005SL+ | 9005, factory 9005LL | Factory LED with no standard replacement bulb |
| Quad Reflector Headlights | Open chrome reflector bowls with no round projector lens | H11, factory H11LL | 9005, factory 9005LL | 3157NA amber |
Projector headlights use 9005 bulbs for both the low and high beams, but the bulbs are installed in separate positions. Quad reflector headlights use an H11 low beam and a 9005 high beam.
If a light position uses a factory-integrated LED, it does not contain a standard removable bulb and cannot accept a halogen-size LED replacement bulb.
Vertical vs. Horizontal Fog Lights
| Fog Light Type | Visual Features | Factory Bulb | Common LED Listing |
|---|---|---|---|
| Vertical Fog Lights | Tall and narrow vertical rectangle or oval | 9006 | 9006/HB4 |
| Horizontal Fog Lights | Wide and flat horizontal rectangle | 9145 | H10/9145 |
Vertical fog lights are commonly found on some Sport- or Rebel-style trucks. Horizontal fog lights are often paired with standard chrome or body-color bumpers. However, the trim name should not replace a physical inspection of the truck.
2016–2018 Ram 1500 Front Bulb Size Chart
Use the headlight and fog light combination below to find the main front bulb sizes for your truck. You can also use the Ram 1500 bulb size chart to check fitment by model year.
| Front Lighting Setup | Common Trims | Low Beam | High Beam | Fog Light | Front Turn Signal | Recommended SEALIGHT Upgrade |
|---|---|---|---|---|---|---|
| Projector Headlights + Vertical Fog Lights | Some Rebel and Sport models | 9005 | 9005 | 9006/HB4 | Factory LED | 9005 LED bulbs + 9006/HB4 LED bulbs |
| Projector Headlights + Horizontal Fog Lights | Some Laramie, Longhorn, and Limited models | 9005 | 9005 | H10/9145 | Factory LED | 9005 LED + H10/9145 LED fog light bulbs |
| Quad Reflector Headlights + Vertical Fog Lights | Some Express and Tradesman models | H11 | 9005 | 9006/HB4 | 3157NA | H11 LED bulbs + 9005 LED + 9006 LED |
| Quad Reflector Headlights + Horizontal Fog Lights | Some Tradesman, SLT, and Big Horn models | H11 | 9005 | H10/9145 | 3157NA | H11 LED + 9005 LED + H10/9145 LED |
This chart is only for the headlights, fog lights, and front turn signals. Reverse lights and other rear bulbs must be identified by the rear light type. For additional model-specific options, browse SEALIGHT LED bulbs for Dodge Ram 1500.
Complete 2016–2018 Ram 1500 Bulb Size Chart
The following chart lists the main exterior and interior bulb sizes for the 2016, 2017, and 2018 Ram 1500.
2016–2018 Ram 1500 Exterior Bulb Sizes
| Light Position | Applicable Configuration | Factory Bulb Number | Common LED Listing | LED Upgrade Note |
|---|---|---|---|---|
| Low Beam | Projector headlights | 9005SL+ | 9005/HB3 | A CANbus decoder may be required |
| Low Beam | Quad reflector headlights | H11LL | H11 | A CANbus decoder may be required |
| High Beam | Both headlight types | 9005LL | 9005/HB3 | A CANbus decoder may be required |
| Vertical Fog Light | Vertical fog light style | 9006 | 9006/HB4 | Check weather protection and cooling |
| Horizontal Fog Light | Horizontal fog light style | 9145 | H10/9145 | Check the product fitment details |
| Front Turn Signal | Quad reflector headlights | 3157NA | 3157 amber | LED bulbs may cause hyperflash |
| Front Turn Signal | Projector headlights | Factory LED | No standard replacement bulb | Confirm that the light has a removable bulb |
| Tail/Brake/Rear Turn Signal | Base rear lights | 3157K | 3157 dual-intensity | LED bulbs may require hyperflash prevention |
| Tail/Brake/Rear Turn Signal | Premium rear lights | Factory LED | No standard replacement bulb | The main red functions use factory LEDs |
| Reverse Light | Base rear lights | 921 | 921/T15/W16W | A white LED is recommended |
| Reverse Light | Premium rear lights | 7440/W21W | 7440/T20 | Do not automatically substitute a 7443 |
| High-Mount Third Brake Light | Replaceable-bulb version | 921K | Search by 921K | A red LED is recommended |
| Cargo Light | Replaceable-bulb version | 921 | 921/T15 | A white LED is recommended |
| License Plate Light | Rear license plate position | 194 | T10/194/W5W | Replace both sides together |
| Roof Marker Light | Factory-equipped trucks | 194NA | T10 amber | Only applies to trucks with this light position |
2016–2018 Ram 1500 Interior Bulb Sizes
Interior bulb fitment may vary with cab style and overhead console design.
| Interior Light Position | Factory Reference Number | Buying Recommendation |
|---|---|---|
| Overhead Reading/Map Light | TS 212-9 | Remove the old bulb and compare its shape and contacts |
| Dome Light | 7679 | Confirm fitment by cab and overhead light design |
| Glove Box Light | Varies by configuration | Some products may be listed in the T10 family |
| Vanity Mirror Light | Varies by configuration | Measure the length of the old festoon bulb |
Do not choose interior bulbs only by market terms such as “T10,” “561,” “562,” or “festoon”. Bulbs sold under these names may have different lengths and contact designs. Factory bulb numbers in this guide were cross-checked against the official 2016 Ram 1500 Owner’s Manual, 2017 Ram 1500 Owner’s Manual, and 2018 Ram 1500 Owner’s Manual.
What to Check Before Upgrading Ram 1500 Bulbs to LED
CANbus Warnings and Flicker
LED bulbs use less power than factory halogen bulbs, so the Ram 1500 may detect them as failed bulbs.
Common problems include:
- Bulb-out warnings
- Headlight flicker
- Lights shutting off after startup
- Turn signal hyperflash
When choosing SEALIGHT LED headlight bulbs, check whether the selected product supports your vehicle’s CANbus system. If flicker or warning messages remain, a SEALIGHT CANbus decoder or load resistor may be required.
Dust Cover Clearance
Space behind the Ram 1500 headlight is limited. LED bulbs with large fans or heat sinks may prevent the dust cover from closing.
Compact SEALIGHT LED bulbs can make installation easier, but always confirm that the bulb locks securely, the wiring is not pinched, and the dust cover closes fully. Do not leave the cover off, as moisture and dust may enter the headlight.
LED Chip Position and Beam Pattern
The LED chips should align with the original halogen filament position. Poor alignment may cause glare, dark spots, scattered light, or an unclear cutoff. Research published by the National Highway Traffic Safety Administration identifies beam distribution, lamp intensity, and incorrect headlight aim as factors that can increase glare.
After installing the SEALIGHT LED bulbs, park the truck on level ground and check the beam pattern against a wall. Adjust the bulb position or headlight aim if the beam is uneven or too high.
Third Brake and Rear Turn Signal Bulbs
Use a red SEALIGHT LED behind the red third brake light lens. A white LED may appear pale or pink through the red plastic. Use a white LED for the cargo lights.
Base rear lights use a dual-intensity 3157K bulb for the tail, brake, and rear turn signal functions. When upgrading to SEALIGHT 3157 LED bulbs, confirm that the product supports dual-intensity operation and hyperflash prevention. A decoder or load resistor may still be required.
2016–2018 Ram 1500 Bulb Size FAQs
Do 2016, 2017, and 2018 Ram 1500 Trucks Use the Same Bulb Sizes?
They follow the same main fitment rules, but the exact bulbs depend on the installed headlights, fog lights, and rear lights—not the model year alone.
What Is the 2016 Ram 1500 Headlight Bulb Size?
Projector headlights use 9005 bulbs for both low and high beams. Quad reflector headlights use an H11 low beam and a 9005 high beam. The same fitment applies to a 2016 Dodge Ram 1500 headlight bulb size search.
What Size Fog Light Bulb Does a 2017 Ram 1500 Use?
Vertical fog lights use 9006/HB4 bulbs. Horizontal fog lights use 9145 bulbs, commonly listed as H10/9145. This also applies to a 2017 Dodge Ram 1500 fog light bulb size search.
What Headlight Bulb Size Fits a 2018 Ram 1500?
The 2018 Ram 1500 headlight bulb size is 9005 for projector low beams or H11 for quad reflector low beams. Both styles use a 9005 high beam.
Why Do Some Ram 1500 Bulb Charts List 921 and Others List 7440 for the Reverse Light?
The Ram 1500 reverse light bulb size depends on the rear light type. Base rear lights use 921/T15, while premium LED rear lights use 7440/W21W.
Are the Ram 1500 Third Brake Light and Cargo Light the Same Bulb Size?
Not exactly. The replaceable Ram 1500 third brake light bulb size is 921K, while the cargo light uses 921. Use a red LED for the third brake light and a white LED for the cargo light.
Final Thoughts
When choosing 2016–2018 Ram 1500 LED bulbs, do not order by model year alone. First identify the headlight style, fog light shape, and rear light type, then confirm the correct Ram 1500 bulb size. Brands such as SEALIGHT offer fitment-focused LED options for many Ram 1500 light positions, which can make product selection easier. After installation, check the headlight beam pattern against a wall and adjust the aim if necessary to maintain clear road visibility without causing glare.
