This is the guide on how to wire an LED light bar without relay. When you are a regular driver on the night, it is very essential to have sufficient lighting so that you can drive properly. When it comes to lighting, LED light is perfect. Photo Credits: Michael Dorausch. With the LED light bar in the front of your car, you would be able to clearly see objects coming in front of your car. To achieve clear lightning in the dark, make sure you select and wire the right LED light bar on the front of your vehicle. An LED light created a great revolution in the light bulbs and tube lights industry.