How To Wire Off-Road Lights Without Relay? Step by Step

The advantages of having a light in front of a car when traveling at night are enormous. Besides, the Chances of accidents are much less, and you can drive with greater confidence. Still, given our innate aversion to mechanical things, some of us may find it challenging to wire off-road lights properly.

However, you should give it a try because the process is not as difficult as it appears. You can wear off-road lights without a relay by following a step-by-step process. Simply, Start by Choosing your Lights. Then select the compatible power supply Before choosing the right resistor. And finally, Wire the Lights to the Switch in your dash and test.

Read moreto explore more about this process along with other relevant aspects.

Circuit Diagram of Typical Off-Road Lights

Circuit diagrams for off-road lights are similar in most cases. Depending on whether you’re using a relay or not and what type of light you’re using, the process may differ slightly, but the core steps remain the same. The simplest basic circuit diagram of a standard off-road light without a relay is shown below.

Picture without Relay

We have added another picture for your better understanding, which includes relay. See the below circuit diagram with relay.

Picture with Relay

Necessary tools & Parts to wire off-road lights without relay

  • Driving light harness
  • Lights, Rocker Switch
  • Resistors, Wires
  • Light Harnesses
  • Socket Sets
  • Drills, Bits, Self-tapping screws
  • Electrical Tape and Electric toolbox

How to wire off-road lights without relay?

Many of us have been in the situation when we wanted to install a new light off-road vehicle and not had a relay that would allow us to wire the lights correctly. But do you need a relay? How is it possible to connect several lamps at once and drive them with one switch? Let’s figure it out!

Below we have described a step-by-step procedure in detail to wire off-road lights without a relay. You will be able to install lights if you follow this procedure. Apply the technique with caution, making sure to disconnect the battery’s negative switch and turn the switch off.

1. Choose your Lights

Because we won’t be using a relay, picking the right light is essential. Halogen and HID lights become overheated, and their use may result in accidents. LEDs, on the other hand, do not heat very quickly.

Also, color temperatures and operating lives should be considered when selecting these lights. There is a link between being more effective and being at a lower temperature.

2. Select an Appropriate Power Supply

After you’ve decided on an LED, you’ll need to decide on a power supply. If the LED uses 20 watts, the power supply must be able to support it. This kind of compatibility is essential.

3. Choosing the right resistor

The resistor lowers current flow while adjusting the signal level. The LED could potentially burst if there isn’t a resistor in place. One must calculate the voltage and amperage before choosing the proper resistor.

4. Wire the Lights to the Switch

Here, we will ensure the connection among battery, rocket switch, and light. We will use a fuse and resistor to maintain stable electricity. Before moving into the step, make sure you turn the switch off.

  • Step One– Connect the first switch of the terminal among the three switches to the resistor, as shown in the first photo, and ensure that copper wire is used. One wire will be connected to the light’s cathode, while the other will be connected to the battery’s cathode.
  • Step Two– Connect the light’s positive side to the center terminal switch. Because this is a direct line, a resistor can be used between them to ensure a steady flow of electricity.
  • Step Three– The last connection will be made between the terminal’s last switch and the battery’s positive side. Make sure you connect them with a fuse between them.

Well, you are done with the most complicated part. The rest of the procedure is quite easy to follow. Before proceeding to that, unplug the negative wire connection of the battery to avoid any mishap.

5. Mount the Off-road Light onto the Vehicle

It is now up to you to make a decision. If I were in your shoes, I would choose the car’s very front side for better road visibility. After you’ve chosen the best location, make sure to attach them with brackets. Another point to note is that, while there may be different types of lighting, the wiring will remain the same.

6. Install the Switch

It is essential to locate the switch in the proper location so that it can be accessed without difficulty. Choose the best location for the switch. To install the switch, you may need to drill.

Now, connect the wire through the engine area to the switch, ensuring the cables are not scatted here and there. Before going any further, make sure the battery’s negative terminal is disconnected.

7. Install Harnesses

It is important to use the remaining plugs by connecting a single plug between the switch and the battery’s negative terminal.

8. Wrap-Up and Test the Off-road Lights

Ensure everything is in order and that the loose wire is held in place. You can use tape for that. Finally, the expected part: turn on the light and inspect the road.

Why Shouldn’t You Use Relay?

Relay has an electric wire that generates magnetic energy, allowing it to convert low current to high current. If you use other lights besides LEDs, a relay is required to generate enough energy to power the light adequately. There are, however, a few drawbacks.

  1. Because of the heavy wiring, the relay may ignite.
  2. Relays are only utilized in low-current applications.
  3. Wear can cause damage over time, necessitating replacement.
  4. It is possible for a relay to overheat and lose electrical energy.
  5. It can be tough to coordinate at times, and the addition of load requires changes.
  6. Additional circuitry is necessary to tolerate high current inrush.


Although the approach appears to be hard at first, Wire Off-Road Lights without a Relay is actually rather simple. There are a few things to keep in mind. Turn off the switch and disconnect the battery’s negative charge.

Moreover, this article covers all you need to know about the relay, including why you should use it and why you shouldn’t. Another point to consider about relay is that you may simply ignore it if you choose LED, but you must use it if you choose halogen or any other type of light. Don’t be afraid to give it a shot; you’ll be fine.

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