How Do Underbody Car Lights Work?

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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.


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Richard

15 years of experience
60 reviews
Richard
15 years of experience
Ford F-150 - Brake Pads Replacement (Front, Rear) - Fremont, California
Excellent communicator, walked me through the fixes and even gave me an idea of what might be next on the fix list.
Dodge Grand Caravan - Brake Pads Replacement (Front, Rear) - Union City, California
quickly diagnosed the problem but knew it would take longer than appt time to fix. since we had appt the next day for brakes he rearranged his schedule to do it all together the next day. very knowledgeable, friendly, and professional.

Tung

14 years of experience
285 reviews
Tung
14 years of experience
Hyundai Elantra - Brake Pads Replacement (Rear) - Mableton, Georgia
Very detailed and customer service oriented. Did an amazing job fixing my back brakes and even set-up a schedule of future appointments for my car!
Ram 1500 - Brake Pads Replacement (Front) - Marietta, Georgia
Tung showed up on time and was very friendly. Changed my brake pads in about 30 minutes and gave me recommendations on when to change the rear pads. Will ask for him by name next time.

Horus

9 years of experience
103 reviews
Horus
9 years of experience
Land Rover Range Rover - Brake Pads Replacement (Front, Rear) - San Antonio, Texas
Horace worked on my Land Rover today. Showed up on time and was professional and courteous. Replaced front and rear break pads. Great job!

Juan

11 years of experience
37 reviews
Juan
11 years of experience
Dodge Avenger - Brake Pads Replacement (Front) - Mountain House, California
Was very thorough in explaining the condition of the car and how the repairs will impact it’s service.

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