We recently came across this custom LED fog light install on a Fiat 500C, and the results turned out fantastic. Instead of using the factory Fiat fog light option, the owner chose a cleaner and brighter LED solution.
He installed GTR Lighting 9W LED Projector Driving Lights along with a matching GTR halo switch. Below, we break down the process step by step.
(Original concept reposted from the Fiat500Owners forum.)
Why Choose LED Over Factory Fog Lights?
First, the owner wanted something different. The factory option worked fine, but it didn’t stand out.
Additionally, most aftermarket LED kits used square or rectangular housings. That design clashed with the Fiat 500’s signature round styling.
Therefore, he selected round GTR Lighting projector units rated at:
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9 watts
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600 lumens
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6000K color temperature
The result maintained the car’s circular theme while improving output.
Removing the Front Bumper
To begin, he removed the front bumper. The process required:
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8 Pozidrive screws
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9 T30 Torx screws
Once he removed the bumper, he popped out the blank fog light covers. Each cover attaches with four tabs.
Next, he used a 2.5-inch hole saw to create an opening for the new projector lights.
Fabricating the Mounting Bracket
Because the Fiat’s factory fog openings only included three mounting holes, he fabricated a custom bracket.
He created an aluminum plate that mounted behind the fog light opening. Then, he drilled a fourth mounting hole to improve stability.
Using M8 x 1.25 bolts, he attached the LED driving lights to the aluminum plate. The longer bolts allowed front-to-back depth adjustment.
To fine-tune positioning, he added fender washers and two locking nuts. This setup sandwiched the aluminum plate securely.
As a result, the lights could move slightly forward or backward depending on preference.
Wiring the LED Driving Lights
For power, he tapped into the factory DRL wiring harness.
Specifically:
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Orange wire = positive
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Black wire = ground
This wiring method retained factory functionality. When the turn signals activate, the system behaves normally.
However, he also installed a GTR halo switch. That addition allows manual control of the LEDs while keeping the stock DRLs active.
Final Results
Once installed, the round projector lights blended perfectly with the Fiat’s styling. More importantly, they delivered crisp white output with improved forward visibility.
The finished look feels factory-inspired, yet clearly upgraded.
Overall, this custom install proves you don’t need bulky housings to get better lighting. With careful fabrication and clean wiring, you can achieve a modern LED setup that looks intentional and performs well.
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John Tobias, Headlight Junkie and Industry Veteran
Before managing pricing and product categories for the DLG brands, John worked directly with customers in customer service and tech support, then spent several years in marketing creating content like this and the videos published online. Today he takes more than ten years of aftermarket automotive lighting experience to events all over the USA, meeting customers and talking to real people about what they care about. He is focused on understanding the market, the trends, the big players, and what matters to lighting enthusiasts. John has tested thousands of lights, works directly with lighting engineers to evaluate the technical performance behind every recommendation, and is one of the foremost experts on everything happening in the world of aftermarket automotive lighting. LinkedIn
