The most common setup for a 2018 Ram 2500 with halogen headlights uses H11 for the low beams, 9005 for the high beams, and H11 for the fog lights. If your truck has upgraded HID or LED headlights, the replacement rules are different and may require different bulbs or assemblies. Always confirm with your vehicle’s manual or VIN.
Halogen headlights: the standard configuration
The following sizes cover the typical halogen-equipped Ram 2500 models. This helps if you’re planning a DIY bulb swap or shopping for replacements.
- Low-beam headlights: H11 bulbs (55W)
- High-beam headlights: 9005 bulbs (HB3, around 65W)
- Fog lights: commonly H11 bulbs (some trims may use H16; verify before purchase)
When purchasing replacements, match the bulb type and wattage listed on your housing or in the owner’s manual. If your specific trim shows different sizes, follow that specification.
Trims with HID or LED headlights
Some 2018 Ram 2500 configurations used factory HID headlights or LED daytime/forward lighting. In those setups, bulbs are not the standard halogen types and may require different replacements or entire assemblies.
- HID headlights: typically use D2S or D3S bulbs, depending on the ballast system
- LED headlights: usually use integrated modules rather than replaceable bulbs
If your truck has HID or LED headlights, consult the owner’s manual, a dealer, or the inside of the headlight housing to confirm the exact bulb type and replacement procedure.
How to identify your headlight type
Look for telltale signs: a ballast and wiring harness point to HID; a single, sealed LED unit indicates LED headlights; otherwise, you’re likely dealing with halogen bulbs and can replace individual bulbs.
Practical tips for replacing headlight bulbs
Regardless of the headlight type, these tips help ensure a safe and effective replacement.
- Wear gloves to prevent oil from your skin getting on halogen bulbs
- Allow the engine and headlights to cool before touching bulbs
- Test the lights before reassembling the housing to confirm correct function and aim
After replacement, check the beam alignment at a safe distance and adjust if necessary to maintain proper illumination and comply with local regulations.
Summary
For most 2018 Ram 2500 models with halogen headlights, plan on H11 for low beams, 9005 for high beams, and H11 for fog lights (with some trims possibly using H16 for fogs). If your truck is equipped with HID or LED headlights, the bulb types differ and may involve D2S/D3S bulbs or non-replaceable LED assemblies. Always verify exact specifications using your VIN or the owner’s manual to ensure you purchase the correct bulbs.