Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. How Do Underbody Car Lights Work?

How Do Underbody Car Lights Work?

underbody lights
Michael Stokes / Shutterstock.com

Your car has a number of important lights on it – headlights, turn signals, taillights, brake lights, running lights, and more. However, your options aren’t limited to what was installed by the automaker. You can install aftermarket taillights and lenses, different headlights and more. That includes underbody car lights – also called glow lights. These come in a wide range of colors and provide a cool glow under your car while it’s driving. How do they work?

Types on the market

There are two primary types of underbody car lights available – fluorescent bulbs, which are the older of the two, and becoming rarer these days – and LED light strips. These are newer, and are becoming the norm for the industry.

Both types are mounted under the car, generally to the underside of the frame. Most of the time, they must be attached with zip ties. Once the strip is installed, it must be wired. This requires a module box and electrical wires. The box is usually mounted near the front of the car, and will connect to the light strips in one of two ways.

The older method required an individual connection to each strip, which meant running four sets of wires under your car (one for each light strip as they’re generally installed on both the left and right sides, as well as the front and rear). A newer method allows them to be connected in series, so the module would connect to the front light strip, then that strip would connect to the second, and so on.

The module box is wired directly to the car’s battery for power (and is usually mounted on top of the engine). Most systems are operated directly from the module box, so there’s no need to splice into your headlight switch. A remote allows you to activate the lights from inside the car.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How Long Does a Fuel Filler Neck Last?
Getting gas from the pump to your gas tank is the only way to keep a car going. The fuel filler neck is a metal tube that is welded to the...
How Long Does a Throttle Return Spring Last?
Not all vehicles on the road feature an electronic throttle control (ETC), which is also called drive-by-wire. For vehicles that don't offer this system, they have a throttle cable instead that...
How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...


Related questions

Q: How Does Underbody Lighting on Cars Work?

Underbody lighting on cars is an accessory that is most commonly installed by the vehicle owner or a specialty shop. The type of underbody lights used today are either LED or neon, and are available in a variety of colors....

Q: Installing an aftermarket radio

The best way to install an aftermarket radio into a car is by using a conversion harness so that no wires are cut going into the dashboard. For most vehicles, kits are available for purchase that make the radio installation...

Q: Left turn signal malfunction.

Check the bulb contacts, front and rear, and just make sure there is no obvious corrosion. Check the headlight harness connection to the headlight bulbs as well. From what you are describing, there is some sort of short or voltage...