How to Change a Licence Plate Light (Step-by-Step Guide)

A burnt-out licence plate light is one of the simplest repairs a driver can make — but it's also one of the most commonly overlooked. Because it only illuminates at night, you may not notice it's out until a police officer points it out during a stop. In many jurisdictions, a non-functioning plate light is a ticketable offence, so it's worth addressing quickly.

What a Licence Plate Light Actually Does

The licence plate light (also called a number plate light or tag light) is a small bulb mounted above or around your rear licence plate. Its sole job is to illuminate the plate after dark so it's readable from a distance. Most vehicles have one or two of these lights, and they're typically wired into the same circuit as your parking lights or tail lights.

They're low-wattage, simple bulbs — and they burn out eventually like any other bulb.

What You'll Need Before You Start 🔧

Before touching anything, gather:

• A replacement bulb (correct type for your vehicle — more on this below)
• A small flathead screwdriver or trim removal tool
• A Phillips screwdriver (some housings require one)
• Clean gloves or a cloth (for halogen bulbs specifically)

The most important step is identifying the correct bulb type. Common sizes include the 194, 168, T10, and W5W, but your vehicle's owner's manual or the sticker inside your existing bulb housing will tell you the exact fitment. Auto parts stores can also look it up by year, make, and model.

How to Change the Licence Plate Light: General Steps

The process varies by vehicle, but this covers how it typically works on most cars, trucks, and SUVs.

Step 1: Turn Off the Vehicle

Make sure the ignition is off and your lights are switched off before starting. This prevents electrical shorts and reduces shock risk, even though the voltage involved is low.

Step 2: Locate the Light Housing

The housing is usually mounted directly above the plate, either integrated into the bumper trim or in a small dedicated casing. On some trucks and SUVs, there are two separate lights, one on each side of the plate.

Step 3: Remove the Housing Cover

This is where vehicles differ most. You may encounter:

• Screwed-in lenses — one or two small Phillips screws hold the cover in place
• Snap-fit covers — a flathead screwdriver or trim tool pops them free
• Integrated assemblies — the entire light module unclips from the bumper or trunk lid

Some vehicles require accessing the bulb from inside the trunk or cargo area rather than from the outside. Check your owner's manual if the exterior approach isn't obvious.

Step 4: Remove the Old Bulb

Once the housing is open, you'll see one of two bulb types:

Step 5: Install the New Bulb

If you're using a halogen bulb, avoid touching the glass with bare fingers. Skin oils cause hot spots that shorten the bulb's life. Use a cloth or gloves to handle it.

Insert the new bulb the same way the old one came out — straight in for wedge types, push-and-twist for bayonet types. It should seat firmly without forcing.

Step 6: Test Before Reassembling

Before putting the cover back on, turn on your parking lights or headlights. The plate light should come on immediately. If it doesn't, check that the bulb is fully seated, then verify the socket is getting power. A lack of power could indicate a blown fuse rather than a dead bulb.

Step 7: Reinstall the Housing

Snap or screw the cover back into place. Don't overtighten screws — the housing is usually plastic and strips easily.

Halogen vs. LED Replacements 💡

Many drivers use this repair as an opportunity to upgrade from a standard halogen bulb to an LED replacement. LEDs run cooler, use less power, and tend to last significantly longer. However, a few considerations apply:

• Fit matters: LED bulbs need to fit the same socket type as your original
• Polarity can be an issue: Some LED wedge bulbs are polarity-sensitive. If the light doesn't work after installation, pull the bulb, flip it 180 degrees, and reinsert
• Colour temperature: Some jurisdictions have restrictions on non-white or excessively blue-tinted plate lights — worth checking locally before choosing a high-kelvin LED

When It's Not Just the Bulb

If a new bulb still doesn't light up, the issue may lie elsewhere:

• Blown fuse: Plate lights share a fuse with other exterior lights. Your owner's manual shows the fuse box location and which fuse controls this circuit.
• Corroded socket: Moisture and road salt can corrode the bulb socket over time, preventing good electrical contact. A corroded socket may need cleaning or replacement.
• Wiring issue: Less common, but a damaged wire in the circuit can interrupt power entirely.

How Variables Shape the Job

What looks like a five-minute repair can vary significantly depending on:

• Vehicle design: Some manufacturers make the housing genuinely simple to access; others route the bulb through the trunk liner or require removing a trim panel
• Vehicle age: Older housings may have corroded screws or brittle plastic that complicates removal
• Bulb type: A standard halogen swap costs very little; an integrated LED assembly on a newer vehicle may be significantly more involved and more expensive
• DIY comfort level: For most drivers with basic tools, this is a reasonable home repair — but vehicles with complex integrated lighting systems can raise the difficulty considerably

The repair itself is straightforward in concept. How it plays out depends on the specific vehicle in front of you.