Install Guide
How to Install LED Work Lights on a Truck or UTV
Step-by-step guide to mounting and wiring LED work lights on a truck or UTV. Covers placement, wiring, switches, and common mistakes.
Shop LED Work LightsWhat Makes LED Work Lights Different From Trail Lights
LED work lights are built to throw a wide, even flood of light over a close-range work area. Think changing a tire on the side of a highway, loading a trailer in the dark, running a farm implement at night, or doing recovery work on the trail. They are not built for long-distance throw down a dark road. That wide beam pattern is the whole point.
Trail lights and light bars are optimized for distance. Work lights are optimized for coverage. Some builds need both, and that is fine, but do not expect a work light to replace a spot or combo bar for driving. If you are still sorting out which type fits your build, the guide on work lights vs off-road lights at /guides/work-lights-vs-off-road-lights breaks that down in detail.
Because work lights are used in close quarters, mounting position matters more than it does with a light bar. A light bar mounted on a roof is forgiving. A work light aimed wrong will blind you or your crew instead of lighting the work area. Getting placement right before you drill anything is the most important step in this whole install.
Tools and Parts You Need Before You Start
Gather everything before you touch the vehicle. Stopping mid-install to hunt for a drill bit or a fuse holder wastes time and leads to shortcuts. Here is what a typical work light install requires.
On the electrical side, you need a wiring harness rated for your light load, an inline fuse or fuse block, a relay if you are running more than one or two lights, a switch, and enough wire to reach from the battery to your mount point with some slack. Do not skimp on wire gauge. Undersized wire gets warm, and warm wire in a vehicle is a problem. A quality relay harness handles the heavy current so your switch only carries the signal load. Browse the power harness options at /collections/power-harnesses and pick one sized for your setup.
On the mechanical side, you need a drill with appropriate bits for your mounting surface, a step bit if you are drilling through a panel, a socket set, a wire stripper and crimper, heat shrink tubing, zip ties or loom for routing, and self-tapping screws or bolts depending on where you are mounting. If your mount point is a roll cage tube or bed rail, you may need a tube clamp mount instead of a bolt-through bracket.
- Wiring harness rated for your light count and wattage
- Inline fuse or fuse block near the battery
- Relay (recommended for any multi-light setup)
- Rocker or toggle switch for cab control
- Drill, step bit, socket set
- Wire stripper, crimper, and heat shrink
- Zip ties and wire loom for clean routing
- Mounting hardware appropriate for your surface
Step-by-Step: How to Mount and Wire LED Work Lights
Follow these steps in order. Skipping ahead, especially wiring before you have confirmed mount position, is the most common reason installs have to be redone.
The wiring portion is straightforward if you use a relay harness. The relay does the heavy lifting. Your switch wire just triggers the relay coil, and the relay pulls power directly from the battery through a fused lead. This keeps heat out of your switch and your cab wiring. If you need a refresher on how relay wiring works, the guide at /guides/how-to-wire-a-light-bar-with-a-relay-harness walks through the same logic and applies directly to work lights.
Once the lights are wired and mounted, do a final check before buttoning everything up. Tug every connector to confirm it is seated. Check that all wire runs are secured away from heat sources, moving parts, and sharp edges. Confirm the fuse is installed and the correct rating for your harness. Then power on and aim the lights before you close up any panels or tighten final hardware.
Where to Mount Work Lights for Maximum Usefulness
Truck bed work lights are most useful when mounted on the cab back glass area, the headache rack, or the bed rails near the tailgate. Pointing them rearward and slightly downward lights up the bed and the ground behind the tailgate. This is the most common setup for farmers, contractors, and recovery rigs. If you want to light the sides of the truck for working alongside the vehicle, a pair of lights on each side of the bed rail works well.
On a UTV or side-by-side, the rear cage uprights are a natural mount point for lights aimed at a trailer hitch or work area behind the machine. Some builds also mount a single work light on the front bumper or A-pillar aimed down for close-in obstacle work. The key is that the light should illuminate where your hands and feet are going, not where your eyes are looking.
For any mount position, mock it up with the light held in place before you drill. Have a helper hold the light while you stand where you will actually be working and check the coverage. A few minutes of test fitting saves a lot of rework. Also consider that work lights are often used with the vehicle stationary and the engine off, so think about whether you want them on a dedicated circuit that does not drain the battery quickly.
Switches, Controls, and Keeping the Install Clean
A dedicated rocker switch in the cab is the cleanest solution for most truck and UTV work light installs. It gives you a clear on/off that is easy to find at night, and it keeps the work light circuit separate from your other accessories. Browse switch options at /collections/switches to find a rocker or toggle that matches your panel or dash.
If you are running multiple work lights alongside other auxiliary lighting, a switch panel or gang switch keeps everything organized in one place. Label each switch clearly. In the dark, at the side of a road, you do not want to be guessing which switch does what. Some builders use colored switch caps or a simple label maker. Either works.
Route all wiring through loom or split conduit wherever it runs through the engine bay, along frame rails, or through any area with abrasion risk. Secure it every several inches with zip ties. Keep wire runs away from exhaust components and any moving parts like steering linkage or suspension. A clean install is not just about looks. It is about the install still working correctly a year from now when it has been through mud, water, and vibration.
Legal Notes and Off-Road Use Considerations
Many LED work lights are sold for off-road or stationary use only. Some are not street-legal when illuminated while driving on public roads. Laws vary by state and sometimes by county, so check your local regulations before mounting lights in positions that could be visible to oncoming traffic while the vehicle is moving.
Work lights used on farm equipment, in a shop yard, or on a private trail have no road-use restrictions. Lights used on a truck that also drives on public roads need to comply with your state's auxiliary lighting laws. When in doubt, wire work lights to a circuit that is easy to turn off before you pull onto a public road, and use a switch that is clearly labeled. The guide at /guides/off-road-lighting-laws-and-covers covers the general legal landscape for auxiliary lighting if you want more background.
Step by step
- 1
Plan your mount position
Hold the light in the intended mount location and check coverage from where you will actually be working. Confirm the position before drilling anything.
- 2
Gather tools and parts
Collect your lights, mounting hardware, relay harness, switch, fuse, wire loom, zip ties, drill, step bit, socket set, wire stripper, crimper, and heat shrink before starting.
- 3
Mount the light brackets
Drill or bolt the mounting bracket to your chosen location. Use hardware appropriate for the surface. On tube mounts, use a clamp-style bracket sized for your cage or roll bar diameter.
- 4
Route the wiring
Run the harness wire from the battery location to the mount point, keeping it away from exhaust, moving parts, and sharp edges. Secure with zip ties every several inches and protect runs through the engine bay with wire loom.
- 5
Connect the relay harness
Connect the fused power lead to the battery positive terminal and the ground lead to a clean bare-metal chassis ground. Plug the light connectors into the harness output leads.
- 6
Install the switch
Mount your rocker or toggle switch in the cab or dash. Run the switch signal wire to the relay trigger input. Keep the switch wire run tidy and secured along existing wiring where possible.
- 7
Test before final tightening
Power on the lights and confirm they work and illuminate the intended area. Check all connectors are fully seated, then tug-test every connection. Adjust aim if needed.
- 8
Finalize and secure everything
Tighten all mounting hardware, seal any exposed splices with heat shrink, zip tie any loose wire runs, and do a final walk-around to confirm nothing is near a heat source or moving part.
Quick answers
Do I need a relay to install LED work lights?
For a single small work light, you can sometimes get away without a relay by running a fused direct wire to a switch. But for two or more lights, or any higher-wattage setup, a relay is the right call. It keeps the heavy current load off your switch and cab wiring, which reduces heat and extends the life of your electrical components. A pre-made relay harness from /collections/power-harnesses makes this straightforward even if you have never wired a relay before.
Can I tap into an existing circuit instead of running a new wire to the battery?
You can tap an existing circuit if it has enough spare capacity for the additional load, but it is usually not the best approach for work lights. Work lights draw meaningful current, and adding them to an already-loaded circuit risks blowing fuses or stressing wiring that was not sized for the extra draw. Running a dedicated fused wire from the battery to a relay, then to your lights, is cleaner and safer. It also makes troubleshooting easier down the road.
My work lights flicker when the engine is running. What causes that?
Flickering is almost always a ground issue or a loose connection. Start by checking the ground wire at the light itself and at the chassis ground point. Make sure the ground is on bare metal, not paint. If the ground is solid, check every connector in the circuit for a secure fit. Flickering that follows engine RPM can also point to a charging system issue or interference, but a bad ground is the first thing to rule out.
What beam pattern should I choose for work lights?
Flood beam is the standard choice for work lights. It spreads light wide and covers a large area at close range, which is exactly what you need when working around a vehicle or piece of equipment. Spot beams are for distance and are not useful for close-in work. If you want more background on beam patterns before you buy, the guide at /guides/flood-vs-spot-lights-buying-guide covers the tradeoffs in detail.
How do I keep water out of my connectors on a truck or UTV that sees mud and rain?
Use weatherproof connectors wherever possible, and seal any butt splices or bare wire connections with adhesive-lined heat shrink rather than standard electrical tape. Tape dries out and unravels over time in outdoor conditions. Route connectors so they face downward when possible, which helps water drain away rather than pool inside the connector. Most quality harnesses come with weatherproof Deutsch or similar connectors already installed.