2016 Ram ProMaster Bulb Sizes (Headlight, Tail, Fog)

As an ASE-certified master technician, I’ve worked on countless commercial vans, and the 2016 Ram ProMaster is a frequent visitor to the bay. Whether you use your ProMaster for local deliveries, long-haul transport, or as a converted camper, maintaining proper visibility is critical for safety and compliance. When a headlight, tail light, or marker bulb goes out, you need to know the exact replacement size to get back on the road quickly.

Below is a comprehensive guide to the OEM bulb sizes, replacement tips, and upgrade considerations for your 2016 Ram ProMaster.

Quick Reference: 2016 Ram ProMaster Bulb Size Chart

Most 2016 Ram ProMaster models came standard with halogen lighting, though some chassis cab or specialized trims may have slight variations in the rear lighting setup. Here is the standard bulb size chart:

Note: Depending on whether you have the cargo van, window van, or chassis cab, rear taillight assemblies can differ slightly. Always double-check your existing bulb’s stamped number before purchasing.

LED vs Halogen Upgrade Considerations

Upgrading the stock halogen bulbs to LEDs is a popular modification for ProMaster owners seeking brighter light output and a modernized look. However, commercial Ram vehicles feature highly sensitive CANBUS systems.

If you install standard LED bulbs, the vehicle's computer will likely misread the lower power draw as a burnt-out bulb. This triggers hyper-flashing for turn signals, dashboard error messages, or even headlight flickering.

To prevent this:

• Buy CANBUS-Ready LEDs: Look for premium LED kits with built-in decoders.
• Use Load Resistors: For turn signals and brake lights, you may need to splice load resistors into the wiring harness to simulate the power draw of a traditional halogen bulb.
• Check Housing Clearances: LED headlight kits often have bulky cooling fans or heat sinks. The ProMaster headlight housings have limited clearance behind the dust caps, so ensure the LEDs you buy are compact or have flexible heat-sinks.

How to Replace Each Bulb

Headlights (Low and High Beam): The front headlights on the ProMaster are fairly accessible compared to other modern vans. Open the hood and locate the rear of the headlight housing. Remove the rubber dust cover, unclip the metal retaining spring holding the H7 bulb, and swap it out. Do not touch the glass of the new halogen bulb with your bare fingers, as the oils can cause premature failure.

Fog Lights: Fog lights are accessed from beneath the front bumper. You may need to remove a small plastic access panel or splash guard to reach the back of the H11 bulb housing. Twist the bulb counterclockwise to remove it.

Taillights (Brake, Turn, Reverse): For standard cargo vans, the rear taillight assembly must be removed. Open the rear doors and locate the retaining screws on the inner edge of the taillight housing. Once removed, pull the entire housing straight back. The bulbs are mounted on a removable circuit board/socket plate.

Interior and Marker Lights: License plate, side marker, and dome lights simply require a small flathead screwdriver or trim removal tool to pop off the plastic lens covers. The 194 and 578 bulbs pull straight out.

Common Lighting Issues for this Generation

The 2016 Ram ProMaster is notorious for a few specific lighting gremlins:

1. Moisture Intrusion: The rear taillight housings are prone to letting in moisture, which corrodes the circuit board and bulb sockets. If you notice your brake lights acting erratically, check the housing for water buildup.
2. Frequent Low Beam Burnouts: Due to the electrical system's voltage regulation and the constant running of headlights as DRLs in some fleets, H7 halogen bulbs tend to burn out quicker than expected. Keep a spare set in the glovebox.
3. Wiring Harness Chafing: On chassis cab models especially, rear lighting wiring harnesses can chafe against the frame rails, causing shorts and blown fuses.

If you are dealing with persistent electrical gremlins, hyper-flashing you can't cure, or simply don't have the time to swap your fleet's bulbs, leave it to the professionals. Find a trusted shop on Repairius.