Retrofitting the rear fog light – simple DIY steps!

Thomas Wachsmuth March 5, 2024 Tuning Wiki

Reading time 5 Min.

The retrofitting of one in Nebelschlussleuch is an important upgrade on old cars that not only improves visibility in bad weather conditions, but also increases safety on the roads. Our instructions provide a general overview of the process of retrofitting the rear fog light. However, it is important to note that the process is of course complete from vehicle to vehicle can be different, depending on the make, model and year of manufacture. However, the steps described here should be one basic guide offer. If you don't dare, you must of course contact a specialist to ensure that the retrofitting is carried out correctly and safely.

in Nebelschlussleuch retrofit

Before you begin the actual installation, it is crucial to select the correct rear fog light for your vehicle. Make sure that the lamp complies with the regulations and standards that apply in your country and has a test mark. Compatibility with the vehicle is essential to ensure that the light not only fits, but also functions properly. Prepare tools and materials: Make sure you have all the necessary tools and materials on hand before starting work. These usually include: screwdrivers, pliers, cable ties, insulating tape, special assembly kit (if required), vehicle-specific instructions (if available).

Preparation of the vehicle

Secure the vehicle by parking it on a level surface and applying the handbrake. Make sure the engine switched off and the key has been removed to avoid accidental electric shock.

Prepare installation location: Find the optimal location for the rear fog light in the rear area. In most cases this is located on the rear bumper of the vehicle. Thoroughly clean and dry the surface before beginning assembly.
Installation of the Fogtail light: Follow the application-specific or general installation instructions to install the rear fog light. On some vehicles you may need to remove parts of the bumper or install special brackets. Be careful and patient during the step to avoid damage to the vehicle or the light itself.
Cabling: Correct wiring is crucial for the function of your rear fog light. Connect the light to the power circuit according to the vehicle and light instructions. Be sure to route and secure all cables securely to prevent damage or loosening while driving.
Testing the rear fog light: After the installation is complete, it is important to check the function of the rear fog light check. Turn on the ignition and press the rear fog light switch to ensure it is working properly. Of course, it can only light up if if the low beam or high beam of the vehicle is also on. Also check that other lighting devices on the vehicle remain unaffected.

Theses

Once you have confirmed that the rear fog light is working properly, complete any open installation work. This includes reattaching all removed parts and cleaning the work area. Retrofitting the rear fog light can be a worthwhile investment in safety. With the right tools, good planning and patience, the process can be carried out successfully. However, if you are unsure, remember to seek professional help to ensure correct and safe installation.

Vehicle from the video, a Nissan Silvia

Initial situation: Cars from Japan or the USA often do not have a rear fog light, which is mandatory in Germany.
Problem: The Nissan Silvia does not have a rear fog light. The option of installing an external rear fog light was rejected as visually “unsightly”.
Solution approach: Decision to replace one of the two reversing lights with a rear fog light.
Material procurement:
- A relay from the VW shelf.
- A red light bulb (21 watts) that fits into the reversing light socket.
Installation:
- Laying a cable into the interior for the new switch.
- Look for a switching positive on the steering column that signals when the driving lights are on, and a permanent positive line for powering the rear fog light.
- Connecting the relay to use the signal from the driving lights and activate the rear fog light via a switch in the interior.
- Installation of a switch in the panel for operating the rear fog light.
- Connection of the signal lines from the light switch to the relay and a permanent plus line.
- Connecting a ground wire from the relay to the body and the switch.
- Laying the positive cable to the rear fog light bulb.
Functional test:
- When the driving lights are switched on, an LED on the switch lights up as a ready indicator.
- Activating the rear fog light via the switch causes the rear fog light to illuminate.
- The rear fog light goes out automatically when the driving lights are switched off, which is TÜV-compliant.

Important technical data and assembly instructions:

Positioning of the rear fog light(s): In accordance with legal requirements, the rear fog light(s) must always be located at the rear of the vehicle. The lamp(s) emit a strong red light that is easily visible even at visibility of less than 50 meters.
Number of rear fog lights: Although a single rear fog light may be sufficient, some vehicles or trailers choose two rear fog lights for improved visibility. The exact number depends on the vehicle owner's preferences and specific vehicle requirements.
Dimensions of the rear fog light(s): The universally applicable rear fog lights usually have dimensions of approx. 80 x 75 x 55 mm.
Mounting accessories: Each third-party kit usually includes mounting accessories and a switch, which is a standing or hanging installation enabled. This provides installation flexibility depending on the structure and conditions at the rear of the vehicle or trailer.

The following note is essential: For safety reasons, tuningblog recommends all repair, inspection and maintenance work exclusively to be carried out in a specialist workshop! Although our information is summarized to the best of our knowledge and belief, we cannot assume any liability for the content. All information is therefore "without guarantee".

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