2019 Ram 1500 Bulb Sizes

Quick reference

The 2019 Ram 1500, a popular full-size pickup, introduced a significant refresh that brought a variety of lighting configurations across its diverse trim levels. Depending on your specific trim (e.g., Tradesman, Big Horn/Lone Star, Laramie, Rebel, Longhorn, Limited), your truck may be equipped with traditional halogen bulbs, advanced factory LED lighting, or even HID (High-Intensity Discharge) projector headlights. It's crucial to verify your truck's specific setup before purchasing replacement bulbs or considering upgrades.

For the low beam and high beam headlights, many 2019 Ram 1500 models came standard with halogen bulbs (H11 for low beam, 9005 for high beam). However, higher trim levels and optional packages offered full LED projector headlights, which use integrated LED modules that are generally not user-serviceable. Some specific trims might also feature HID projector systems. Fog lights typically utilize an H11 halogen bulb across most trims. Daytime Running Lights (DRLs) and front turn signals often share the same 4257NAK bulb in halogen systems, while LED-equipped headlights will have integrated LED DRLs and turn signals.

Rear lighting on the 2019 Ram 1500 is predominantly LED for the tail lights, meaning the individual bulbs are not replaceable. However, the reverse lights are typically 921 halogen bulbs, and the rear turn signals use 7440A bulbs. License plate lights take 168 bulbs, and front and rear side markers commonly use 194 bulbs. Interior lighting generally consists of halogen bulbs, with front and rear dome lights often using a 578 bulb and map lights using a 194 bulb. The cargo lamp also typically uses a 921 bulb.

LED vs halogen upgrade considerations

Upgrading your 2019 Ram 1500's halogen bulbs to LED can dramatically improve light output, modernize the look of your truck, and offer a longer lifespan. However, there are several key points to consider:

• CANBUS Errors: The 2019 Ram 1500 utilizes a sophisticated CANBUS (Controller Area Network Bus) system. LED bulbs draw significantly less power than their halogen counterparts, which can cause the truck's computer to detect a "bulb out" error, resulting in flickering, dashboard warning lights, or the lights not functioning at all. To avoid this, you will often need to use "CANBUS-ready" or "error-free" LED bulbs that include built-in resistors, or install external load resistors in parallel with the LED bulbs.
• Adapters and Decoders: In addition to CANBUS decoders, some LED conversion kits may require specific wiring harnesses or adapters to properly connect to the factory bulb sockets. Always check the compatibility of any aftermarket LED kit with your specific Ram 1500 model and trim.
• Beam Pattern and Glare: When replacing halogen projector or reflector bulbs with LED equivalents, it's crucial to choose high-quality LEDs designed to mimic the filament placement of the original halogen bulbs. Poorly designed LEDs can scatter light, creating an ineffective beam pattern and excessive glare for oncoming drivers. Aim for LEDs with adjustable collars or those specifically designed for automotive headlight applications.
• Integrated LED Headlights: If your 2019 Ram 1500 came from the factory with full LED headlights, upgrading is generally not an option as the LEDs are integrated into the headlight assembly and are not designed to be replaced individually.

How to replace each bulb

Changing most bulbs on the 2019 Ram 1500 is a straightforward DIY task, but some require a bit more effort:

• Headlights (Low/High Beam): For halogen systems, access is typically from behind the headlight assembly. You may need to remove a plastic splash shield or move the wheel well liner. Twist the bulb counter-clockwise to remove it, disconnect the electrical connector, and reverse for installation. For factory LED or HID systems, individual bulb replacement is generally not possible.
• Fog Lights: Access usually involves reaching through the front bumper or removing the wheel well liner. Twist to unlatch and pull out the bulb.
• Daytime Running Light / Front Turn Signal: In halogen setups, these are often integrated into the headlight housing. Follow the headlight removal procedure, or access from the rear of the housing. Some models may allow access by turning the wheel and pushing back the fender liner.
• Rear Turn Signal: Access is typically from behind the taillight assembly after opening the tailgate. You may need to remove retaining screws to pull the taillight housing out slightly or access a panel behind the light.
• Brake Light / Reverse Light: These are usually accessed by removing the taillight assembly. Open the tailgate, remove any visible screws securing the taillight, and carefully pull the assembly straight back. Twist the bulb socket to remove the bulb.
• License Plate Lights: Usually, simply use a Phillips head screwdriver to remove the clear lens cover and replace the bulb.
• Side Markers: Often require prying off the lens cover with a plastic trim tool or twisting the socket out from behind the fender.
• Dome/Map Lights: Carefully pry off the clear lens cover with a plastic trim tool to access the bulbs. Be gentle to avoid breaking plastic tabs.
• Cargo Lamp: Access is typically from the inside of the cab or by reaching up to the third brake light assembly. Remove screws or pry off the lens to access.

Common lighting issues for this generation

The 2019 Ram 1500, while lauded for its capabilities, can experience a few common lighting-related issues:

• Flickering or Intermittent Headlights: This can often be due to loose connections, corroded sockets, or, in the case of aftermarket LEDs, improper CANBUS decoding causing power irregularities.
• DRL Malfunctions: If you have halogen DRLs that also serve as turn signals, premature bulb failure can occur due to constant use. Integrated LED DRL issues are less common but could indicate a problem with the LED module itself or the associated wiring/control unit.
• Brake Light Switch Issues: While not a bulb issue directly, a faulty brake light switch can cause brake lights to not illuminate or to remain on constantly, impacting safety and leading to battery drain. This presents similar symptoms to a burnt-out bulb.
• Trailer Light Connection Problems: Owners who frequently tow may encounter issues with trailer lights not working correctly, often due to corroded trailer wiring harnesses or faulty trailer light modules, rather than the truck's bulbs themselves.
• Tail Light Condensation (LED Units): Some owners of Ram 1500s with factory LED taillights have reported issues with moisture or condensation building up inside the taillight assembly. This typically indicates a seal issue and often requires replacement of the entire taillight unit.

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