Xenon HID Headlight Unit Ballast A1669002800 Q03 For Benz GL350 ML350 SL65 AMG

Xenon HID Headlight Unit Ballast for Mercedes-Benz

This Xenon HID Headlight Unit Ballast, OEM cross-reference A1669002800 and Q03, delivers the high-voltage start-up and steady current your factory HID system needs to fire and maintain the bulb.

Overview

This Xenon HID Headlight Unit Ballast is a direct replacement control module that powers your vehicle's xenon low beam and keeps the arc stable once the lamp is lit. Built to factory dimensions for the listed Mercedes-Benz applications, the ballast mounts at the original location and connects to the existing harness. It is intended for owners and technicians replacing a failed or intermittent factory ballast.

Built For Performance

• High-voltage ignition circuit fires the xenon bulb on command
• Regulated output holds a steady arc for consistent light color
• Sealed housing resists moisture intrusion in the headlight cavity
• Plug-in connectors match the original wiring layout
• Compact footprint fits inside the existing headlight assembly
• Constructed to withstand vibration and heat cycling

Fits These Machines

• for Mercedes-Benz GL350
• for Mercedes-Benz ML350
• for Mercedes-Benz SL65 AMG

On-The-Job Use

• Restoring factory xenon beam function after ballast failure
• Headlight assembly repair before an inspection
• Replacing a ballast that flickers or fails to strike
• Front-end collision repair where the headlight was serviced

Specs At A Glance

Good To Know

Q: Can I install this without changing the bulb? A: Yes, only swap the ballast when the existing xenon bulb still lights correctly on a known-good control module. Confirm the fault is in the ballast and not the bulb or wiring before ordering.

Q: How do I match this ballast to my vehicle? A: Compare the part number stamped on your original ballast against A1669002800 or Q03. Fitment can vary by trim and headlight type within the same model year.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.