For the 2018 RAM 1500, the high-beam headlight uses a 9005 bulb. Low-beam fitment depends on the headlight design: projector-type headlights use 9005, while headlights without projectors use H11. Confirm the headlight style before ordering, since the low-beam bulb changes between these configurations.
Projector-equipped trucks also use LED lighting for the front turn signal, parking light, front side marker, rear side marker, brake light, tail light, and rear turn signal. Non-projector configurations use replaceable bulbs in these locations, with the listed sizes varying by function. Trucks with two headlights use 3157 for the front turn signal and parking light, while four-headlight configurations use 3157A in those positions.
- Reverse light: 7440 with projector-type headlights; 921 without projectors.
- Center stop light: 921.
- License plate and glove-box lighting: 194 or 7441.
- Dome light: 578; map light: 212-2 or 578.