2021 RAM 2500 Light Bulbs Types:
| Bulb | Type |
| Interior Lights: | |
| Overhead Console Lamps | TS 212–9 |
| Dome Lamp | 7679 |
| Exterior Lights: | |
| Low Beam (Halogen Reflector Headlamp) | H11LL |
| High Beam (Halogen Reflector Headlamp) | 9005LL |
| Low & High Beam (LED Reflector Headlamp) | LED |
| Low & High Beam (LED Projector Headlamp) | LED |
| Turn Signal / Front Position (Halogen Reflector Headlamp) | 7444NA |
| Turn Signal (LED Projector Headlamp) | LED |
| Front Position (LED Headlamps) | LED |
| Turn Signal (LED Reflector Headlamp) | 7444NA |
| Front Side Marker (Headlamps) | LED |
| Front Fog Lamps (Halogen Reflector Headlamp) | H11LL |
| Front Fog Lamps (LED Headlamps) | LED |
| Side Indicators (Front And Side View Mirror) | LED |
| Base Rear Tail/Turn and Stop Lamp | 3157K |
| Premium Rear Tail/Turn and Stop Lamp | LED |
| Premium Backup Lamp | 7440/W21W |
| Center High Mounted Stop Lamp (CHMSL) | 921 |
| Cab Roof Marker Lamps | 194NA |
| Rear Lamp Bar ID Marker Lamp | 194 |
| Side Marker Lamps (Dual Rear Wheels) | 194 |
| Backup Lamp | 921 |
| Rear License Plate Lamp | 194 |
