The lights on the Volkswagen T4 are poor, to say the least, and it's worth taking some time to improve them, especially since they are responsible for our safety.
How to make the lights in a Volkswagen T4 more efficient?
- Cleaning the headlights: dirt and debris on the surface of the headlights can weaken the quality of the lights. Therefore, it is important to clean them regularly.
- Replacing bulbs: Older Volkswagen T4 models are often equipped with standard halogen bulbs, which can be easily replaced with more efficient ones
- Light alignment: If the lights are misaligned, it can cause glare to other drivers or poor light quality. Therefore, it is important to regularly check and adjust the alignment of the lights.
- Reflector reconditioning: involves repairing damaged or soiled reflector surfaces to improve the quality of lights and increase driving safety. The remanufacturing process may include cleaning, replacing damaged components or replacing with new reflectors.
- Installing additional lights: If you need additional lighting, you can install additional lights such as fog lights, LED daytime running lights or daytime running lights.
- Adding relays to the lamp harness: Adding relays to the lamp harness is a popular way to improve the quality and safety of your car's lights. Relays are electrical devices that are used to transmit electrical signals and control the operation of devices such as lights.
Adding relays to the lamp harness reduces the load on the electrical system and improves the quality of the lights, as the relay is able to transmit more current than directly from the light switch. This in turn allows for brighter and more stable lights.
Adding a new VW T4 headlight harness
You can make it yourself, or purchase it (for example, on Facebook groups about T4). As it just wasn't available on groups in Poland, I ordered on ebay.co.uk from the UK.

The bundle itself £24 + additional import costs (UK is outside the EU). Total about £43, or £230.
The effect overall is that I can finally see the lights. Previously, driving in the city, I could not see if they were on or not. They glowed so faintly. Outside the city, when possible I rode long ones to see anything.

In the photo, the effect is slightly conquered by the snow, but really the effect is considerable. The installation itself is trivial. It takes less than 10 minutes, to unplug the old plugs, connect the new ones, connect the cables to the battery and ground.