Marker Lights: LED Clearance and Side Marker Lights for Trucks, Trailers and Fleets
A marker light does not flash and rarely draws attention to itself, yet it is one of the most important lighting fixtures on any wide or long vehicle after dark. CBT Auto Parts stocks marker lights, clearance lights, and side marker units for trucks, trailers, and commercial fleets, each rated for the vibration and weather exposure these vehicles face daily.
Aftermarket marker lights are standard equipment across the commercial vehicle industry, and every unit here matches factory mounting and output requirements. This range sits alongside Turn Signals, since side marker lights are frequently confused with indicator lights, and Trailer Lights for anyone fitting out a full trailer lighting setup. Both are part of our wider Lighting & Signaling Parts family. Most orders ship within twenty-four hours.
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What Marker Lights Actually Do and Why They Do Not Flash
A marker light exists to answer one question for other drivers on the road at night: how wide, how long, or how tall is that vehicle? Unlike a turn signal or brake light, a marker light stays constantly illuminated whenever the headlights are on, giving surrounding traffic a fixed reference point for judging the outline of a truck, trailer, or wide load rather than a moving signal to react to. This is why marker lights are non-negotiable equipment on commercial vehicles and heavy trailers in particular, since a vehicle wider than a standard car relies on these fixed points of light to communicate its true size in low-visibility conditions.
Clearance Lights Versus Side Marker Lights: Positioning Matters
The terms clearance lights and side marker lights are often used interchangeably, but their mounting position tells a more specific story.
- Clearance lights mount at the top corners of a truck or trailer, marking the outer edges of the vehicle's height and width from a distance, commonly seen along the roofline of larger commercial vehicles.
- Side marker lights run along the length of the vehicle's body, typically at the midpoint of a trailer or truck bed, giving a side-on reference point for vehicles overtaking or merging alongside.
- Front and rear marker lights sit at the very front and rear corners, working alongside headlights and taillights rather than replacing either function.
Knowing which position on your vehicle has failed determines which specific unit you need, since clearance and side marker housings are rarely interchangeable.
Choosing Between Standard and LED Marker Lights
Marker light technology has shifted heavily toward LED in recent years, and the choice matters more for commercial vehicles than passenger cars.
- Standard incandescent marker lights remain available as a factory match replacement, lower cost but with a shorter lifespan under constant use.
- LED marker lights run considerably longer between failures, a meaningful advantage for fleet vehicles that cannot afford frequent downtime for a small fixture.
- Amber marker lights are the most common configuration for side and rear positions across Australian regulations, with 12V amber LED marker lights the standard fitment for most trucks and trailers.
- White marker lights are typically reserved for front-facing positions only, working alongside the vehicle's forward lighting rather than as a standalone signal.
For fleet operators replacing multiple units at once, LED is generally the lower total cost option once reduced replacement frequency is factored in.
Fitment Checks for Marker Lights
Marker light mounting varies significantly across commercial vehicle makes and body configurations.
- Confirm whether your vehicle uses a surface-mount or recessed marker light, since the two are not interchangeable without modifying the mounting point.
- Check the exact position, clearance, side, or front and rear, since housings differ by placement even within the same vehicle.
- For popular commercial models including the Ford Transit, side marker light positioning and housing shape can vary across body length and trim variant, so confirm against your specific configuration.
- Note the wiring connector type, since older and newer commercial vehicles often use different plug styles even for the same physical housing.
Our team can confirm compatibility against your specific vehicle or fleet configuration before you order if any detail is unclear.
Marker Lights and Where They Sit Among Other Signal Functions
Marker lights are easy to confuse with two other categories on this site, and telling them apart avoids ordering the wrong part. If the fixture in question flashes rather than stays constantly lit, it belongs in Turn Signals instead, since side marker lights and side indicator lights sit close together on many vehicles but serve entirely different functions. If you are fitting out a trailer specifically rather than a truck or fleet vehicle, our Trailer Lights range covers the broader lighting kit, while this page focuses on the marker and clearance function specifically. Confirming whether your fixture flashes and whether it belongs to a standalone vehicle or a trailer setup narrows down the correct category quickly.
Shipping and Support on Every Marker Light Order
Most marker light orders dispatch within twenty-four hours, with metro delivery typically landing in two to four business days and regional addresses taking a little longer. Fleet and bulk orders are handled with the same dispatch priority as single-unit purchases. Tracking is emailed as soon as your order leaves the warehouse, and our lighting and electrical returns team handles any mismatch directly.
