Installing underglow lights on a car is a doable weekend project that involves mounting LED strips, routing wires safely, and connecting a Bluetooth controller to the battery with an in-line fuse.
Done right, underglow transforms the look of a vehicle at night. Done wrong, strips fall off on the highway or a shorted wire kills the battery. The standard kit arrives with four LED strips, a controller, extension cables, and adhesive tape—but tape alone will not hold forever. A clean install adds physical fasteners and runs wires where heat and moving parts cannot reach them. The full process takes most people three to five hours.
What Comes in a Standard Underglow Kit
Most budget and mid-range kits include the same components. Knowing what is in the box before you start saves time hunting for parts mid-install.
- Four LED strips (two side, one front, one rear)
- Bluetooth controller box with wiring harness
- Four waterproof extension cables with male/female connectors
- One 2-meter bridge cable (3-pin: red, black, yellow)
- 15 lb or stronger double-sided adhesive tape
- Zip ties, adhesive clips, and sometimes self-tapping screws or brackets
If the kit does not include a fuse tap, buy one for roughly $3.
Mounting the LED Strips Securely
Adhesive backing alone will fail over time. Heat, vibration, and road grime weaken it, and a dangling strip dragged at highway speed is gone in seconds. The mounting process fixes that risk before it starts.
Park on level ground, engage the parking brake, and disconnect the negative battery terminal. Jack the vehicle up and place it on jack stands at the manufacturer’s lift points—never work under a car supported only by a jack. Clean every mounting surface with isopropyl alcohol or a degreaser and let it dry completely.
Lay the strips on the ground for a dry fit along the side skirts, front bumper area, and rear frame. Avoid exhaust pipes, suspension components, and any spot that gets hot enough to melt plastic. Once you are satisfied with placement, peel the adhesive backing slowly—peeling it all at once lets dust stick to the tape. Press each strip firmly into place, then reinforce it with zip ties or the included brackets at each end and the midpoint. For curved or uneven surfaces, add black adhesive stickers and an extra zip tie.
Wiring Routes That Last
The control box goes in a dry, hidden spot near the battery but away from the engine block and radiator. Heat kills these controllers faster than anything else.
Connect the LED strips in order: Front first, then Sides, then Rear, using the waterproof extension cables (male to female). The final strip plugs into the Y-extension cable, then into the 2-meter bridge cable that leads to the controller box. Run all wires along the vehicle’s frame and secure them with zip ties every 12 to 24 inches. Keep every wire clear of the exhaust, drive shaft, steering rods, and any suspension part that moves when the car goes over a bump.
For the electrical connection: connect the harness red wire to the battery positive terminal with the in-line fuse installed, and connect the black wire to the negative terminal or a chassis ground. On SP105E controllers, black runs to ground (GND), red to power (VCC), and yellow to the data (DAT) input. Reconnect the negative battery terminal, turn the ignition on, and test the lights with the app or remote before lowering the vehicle back to the ground.
If you are still choosing which kit to buy, our tested roundup of the best car underglow kits breaks down what works for different budgets and vehicles.
Testing, App Pairing, and Common Mistakes
Test everything while the car is still on jack stands. Download the controller’s app from the Apple App Store or Google Play Store, pair via Bluetooth, and cycle through colors, brightness, and patterns. Confirm that music sync works if that feature is important to you. A fault caught now is a ten-minute fix; a fault caught after the car is back on the ground is a full re-install.
First, relying on tape alone—the strips fall off from vibration. Second, routing wires near the exhaust or suspension—heat melts the insulation, and moving parts snap the wire. Third, skipping the in-line fuse—a short then sends full battery current through the controller and LED strips, destroying them in seconds. Clean the surface with alcohol, use mechanical fasteners, and install that fuse.
FAQs
Do I need to remove the tires to install underglow lights?
No. You only need to jack the vehicle up enough to reach the underside mounting points. Securing the car on jack stands and working under it with the tires removed makes access easier but is not required.
Will underglow lights drain the car battery overnight?
Not if the wiring is correct. The control box should only draw power when the ignition is on or the app activates it. A continuous drain usually means the red wire was connected to a constant battery source instead of a switched circuit. Confirm the connection with a multimeter after installation.
Can I install underglow lights on any car?
Any 12-volt vehicle with a standard battery will work. Check that the kit voltage matches the car (almost always 12V). The only limitation is mounting space: cars with plastic underbody panels or side skirts that leave no gap between the body and the road may require custom bracket placement.
References & Sources
- iJDMTOY. “Under Car LED Underbody Light Kit Installation Guide.” Covers mounting, wiring, and electrical connection procedure used in this article.