How to Install Rock Lights? | Under-Glow Done Right

Adding rock lights transforms night off-roading, making obstacles visible before your tires find them. The job is very doable for a weekend DIYer, but doing it wrong leads to water damage, dead batteries, or a light bouncing off on the trail. This guide walks through the process for most 12V kits, with the specific hardware and steps from manufacturers like Diode Dynamics, Oracle, and Black Oak LED. If you’re still shopping for a set, our roundup of the best waterproof rock lights on the market can help you pick a kit that lasts.

The Core Installation Workflow

Every decent install follows the same order: test, place, mount, wire, and verify. Skipping the test step is the costliest mistake, so begin by connecting each pod to the harness and powering them up before touching a wrench. This confirms the chase direction (which light leads to which) and that no pod arrived defective.

1. Test All Lights First

Connect the full harness to the battery or a jump pack. Turn the lights on and confirm each pod works and blinks or colors match the controller. This ten-minute check saves you from mounting a dead pod and redoing everything. Disconnect the vehicle battery before the wiring phase.

2. Choose Mounting Locations

For a 6-light kit, Diode Dynamics suggests placing two lights in front of each front tire, two just behind the front tires, and the remaining two ahead of the rear tires. This pattern gives the driver and a spotter good coverage of the wheel path. Check clearances around wheel travel and steering components so nothing rubs under suspension flex.

3. Mount the Pods

Not every kit requires drilling. Depending on your model, you can use one of these documented methods:

• Nut, bolt, and washers — the standard for drilled mounts.
• Self-drilling screws — good for metal surfaces.
• Strong magnets — ideal when you want a removable mount.
• VHB double-sided adhesive — works for lightweight pods on clean surfaces.
• Zip ties — some kits even have integrated tabs.

Diode Dynamics’ center-hole mount calls for a 7/32″ or 15/64″ drill bit, plus an extra 3/8″ hole if you’re hiding wiring through the mounting surface. The pod secures with the supplied nut, bolt, and washers; reinstall the rubber dust seal and clip the lens back on. Don’t overtighten—you’ll crack the housing or strip the mount.

4. Route and Secure the Wiring

Run the harness away from sharp edges, suspension parts, steering, exhaust, and anything else hot or moving. Secure slack with zip ties every foot or so. The Photon Rock Light-RGB manual suggests zip ties for excess wiring at each pod. If you drill through metal, deburr the hole and use a grommet to protect the wire insulation.

Power Hookup Options

Your kit’s manual will specify its preferred method, and they differ. Match wiring to what the manufacturer designed for—mixing methods can void a warranty.

Most kits use a 12V source. The three common hookups are:

• Battery direct: Connect the red lead to the battery positive and the black lead to a clean, unpainted chassis ground. Black Oak LED uses this approach.
• Fuse tap: The Photon “Expert Install” method uses a 10amp switched fuse tap for the positive lead, with the negative wire grounded to metal. This way the lights turn off with the ignition, so they can’t drain the battery.
• Switch panel: Run the positive to an aftermarket switch panel (like from sPOD or Switch Pros) and ground the negative to the chassis.

Either way, use a fuse on the positive lead. No fuse is a fire risk and a common reason these kits die prematurely.

Avoiding the Common Install Mistakes

The failures that send people back to the garage are consistent across brands. Skip the test-fit and you risk mounting a dead pod. Overtighten hardware and you’ll crack the mount. Route wires haphazardly and you’ll find a severed cable after the first trail. Mount without checking clearances and a tire will shred the pod at full lock.

If your kit is RGB or Bluetooth-controlled, plan to pair it with the app after wiring, before you button everything up. Verify whether the controller expects battery-direct power or a switched source—this determines whether the lights stay on while parked.

Once everything is mounted and wired, reconnect the battery and run a final test. Confirm every pod lights up, the chase direction matches your setup, and all wiring is secure and clear of hazards.