HID Bulb Ballast Replacement Made Simple

Written by

CarParts.com Research Team

Automotive and Tech Writers

Updated on November 25th, 2024

Reading Time: 3 minutes
Summary
  • The HID ballast is the component responsible for mediating the voltage and current of an HID bulb.
  • Replacing it requires tools like safety gloves and goggles, electrical tape, screwdrivers, pliers, and wire cutters.
  • Some of the common problems you might run into after replacing HID bulb ballasts include flickering lights, bulb failure, and weak beam patterns.

An HID ballast is the component responsible for mediating the voltage and current of an HID bulb. It allows the bulb to start up safely and warm up to its full brightness without burning out. Any vehicle that uses a HID lighting system requires an HID ballast.

Are you considering replacing your vehicle’s HID ballast? Here’s what the process might entail.

How to Replace Your HID Bulb Ballast

Bear in mind that it’s generally recommended to hire a professional to perform this procedure for you. The exact procedure for replacing a ballast varies from vehicle to vehicle so it’s always a good idea to consult an expert.

The exact procedure for replacing a ballast varies from vehicle to vehicle so it’s always a good idea to consult an expert.

If you want to learn how to replace your vehicle’s HID bulb ballast, follow these steps carefully.

What You’ll Need

What to Do

  1. Park your vehicle and turn off the ignition.
  2. Open the hood.
  3. Turn off the car battery and disconnect it from the vehicle.
  4. Unplug the HID bulbs and remove them carefully. Make sure you’re wearing your safety equipment.
  5. Remove the old HID bulb ballasts.
  6. Carefully install your replacement HID bulb ballasts.
  7. Secure the wiring and the ballast with electrical tape before mounting the ballast securely in the engine bay.
  8. Reinstall the HID bulbs and close the hood.
  9. Reconnect the car battery and test out your HID headlight ballasts.

HID Bulb Ballast Troubleshooting Tips

After replacing your vehicle’s HID bulb ballasts, you might experience some technical difficulties with your vehicle. Here are some tips to help you diagnose and fix the problem.

Flickering Lights

If your HID lights flicker after replacing the bulbs or the ballasts, there might be something wrong with how power is allocated. Installing a CANbus decoder can reduce power issues and fix the problem.

HID Bulb Failure

Another problem you might experience after replacing the bulbs or the ballasts is that the bulbs may fail to turn on. If this happens, it’s a good idea to check the wiring, fuses, and battery connection to see if there are any anomalies. Correcting them should fix the problem.

Weak Beam Patterns

If the beam patterns from your HID bulbs are poor, the problem might lie with the bulb or ballast alignment. It’s a good idea to inspect them one more time to check for problems with their alignment. Checking the reflector position is also a good idea.

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HID Ballast Types

There are two HID ballast types to keep in mind: probe start and pulse start HID ballasts. Though both are used to supply and mediate the voltage and current of HID lighting systems, they differ in many ways.

Probe Start HID Ballasts

Probe start HID ballasts use a pair of electrodes to start, making electrons jump between them until the HID bulb is lit. After this happens, the starting probe electrode is removed from the circuit.

These ballasts take a long time to warm up the bulb to reach its full brightness. Probe start HID ballasts aren’t as common as they used to be since pulse start HID ballasts have eclipsed their technology.

Pulse Start HID Ballasts

Pulse start HID ballasts use a high-voltage igniter to start. These ballasts are more modern, making them direct upgrades in many ways.

They’re efficient and tend to make bulbs last longer on average by ensuring the lumens don’t depreciate as quickly. Pulse start HID ballasts are also more energy efficient than probe start HID ballasts.

Difference Between Ballasts and HID Ballasts

Ballasts are used to regulate the voltage and current supplied to a light source. They ensure that the lights operate safely and efficiently, making them crucial components of any lighting system.

On the other hand, HID ballasts are specifically designed to be used with HID bulbs. HID ballasts perform two key functions: provide the high-voltage pulse needed to light the bulb and regulate the electrical current to maintain steady light output. They’re a critical component of any vehicle that uses HID lighting systems because the system won’t function without one.

Written By CarParts.com Research Team

Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.