How to Wire Led Light Bar Without Relay

If you need a wide light beam while driving at night, an LED light bar is ideal for you. It has become popular over the years as LED is more efficient than traditional lights.

The light that comes from LED has better visibility when driving off-road. 


However, some people want to use a lightbar without a relay because sometimes it creates extra hassle.

So, If you want to know how to wire led light bar without relay, then stick with this blog post till the end and mount your LED lightbar easily.

What is Relay?

Relays are Electromagnetic Switches That let a low current circuit convert into high current circuits. The conversions occur when electrical inputs activate electromagnets.

Relays effectively work as a switch or an amplifier by leveraging the weak information powering into stronger currents. Many electronics have variations of relay inside.

Relays can be used as a converter switch from low current to high current or switching circuit on or off, reverse polarity, and much more.

For example, when adding large amp led lights like off-road light bars, driving lights, or other work lights to your vehicle, you must need a relay switch to power the light adequately.



Advantages and Disadvantages of Relay

Advantages of Relay:

  • Relays consume low current. However, it can activate large machines with great power.
  • It can work well in high temperatures.
  • Relays are cost-effective but have great value and performance. It offers essential functions and can be integrated into a variety of circuit types.
  • Relay can switch multiple contacts with just a single contact at once.
  • Relay can be used both as a dc (direct current) or ac (alternating current) system relatively to protect AC and DC equipment.

Disadvantages of Relay:

  • Relays contacts can affect over time due to continuous use, dust, and pollutions. As time passes, the component inside the relay grows weak.
  • They generate a lot of noise with the activation and deactivation of the contacts. This noise could be so much disturbing if you use a lot of relays in your system.
  • Like contactors relay cannot withstand high inrush currents. So, they are of no use in the microelectronic circuits because the relay’s coil needs a high number of currents to energize. As a result, additional circuitry is required to withstand high inrush current.
  • It needs periodic testing and maintenance, unlike static relays.
  • Due to the design, relay parts are subject to mechanical and electrical wear and may cause ignition between the switching contacts. Which must be taken into consideration when setting up the circuits.

Process: How to Wire Led Light Bar Without Relay

Step 1:

First, select an LED light bar that is best suitable. Next, you need to determine some common things when choosing your led light bar.

Some Factors include color temperature, lifespan watt, and voltage consumption of the lightbar.

Step 2:

The next thing you need to do is locate the appropriate location to mount the led light bar. You can choose a bulbar, rooftop, or any other location of your vehicle that is best suitable for your needs.

Try to be creative in this part because an appropriate mounting location can make a big difference.


Step 3:

Once You have found the right place to mount the LED light bar, drill the accurate size hole to the appropriate location, you want to mark the place before drilling.

So that you know you are drilling in the right place. Also, be careful that you do not damage any other parts of your vehicle while drilling.

Step 4:

After you have completed the drilling process, it is time to mount the brackets of the LED lightbar. Make sure you’ve all the screws available.

Secure it firmly with the given screws and lightbar. You can make adjustments and tweak them as you want. But do not overtighten it, as it will need future adjustments.

Step 5:

Now it is time to mount the switch. But before that, you want to lose the wire connection from your car battery.

Also, doing attachment while the car battery is active can cause electric shock. So, it is wise to make sure there are no harm issues during the process.

Step 6:

After you have secured the car battery now, it is time to identify the place where you will mount the switch. You want to mount the switch where it is easily accessible.

Once you find the switch’s exact location, it’s time to mount the switch with a power supply. You need to make sure the power supply can handle the same voltage and wattage required for the LED lightbar.

Step 7:

Once you determine the suitable power supply for your LED lightbar, connect the switch with the power supply.

You also need to pick a resistor to resist the high current value that passes through it. If you do not, then there is a high chance it can damage your LED lightbar.

This part requires some calculations of voltage and amperage before picking up the suitable resistor.

Connect the Led Lightbar With the Power Supply

Step 8:

When you pick up the appropriate resistor, then it’s time to mount the switch. First, you need to make sure the switch is in off mode to avoid any mishap.

You can use copper wire to connect the switch with the resistor.

When connecting the wire, you must attach both ends with their respective position and solder them alongside.

After that, connect the other side of the switch with the power supply. You also need to connect the led lightbar with the power supply.

Step 9:

Once you have connected all the parts now, you need to connect the remaining part with the harnesses. 

You should connect the ground wire earthen with the negative battery terminal and the other side with the switch.

Step 10:

Once you have connected all the wires and plugged them correctly, it is time to check everything. First, see if there is any loose connection or wire.

If there is any, tape them properly so that they will not get loose over time. Next, check again if the LED lightbar fitted properly; tighten them up so that they are mounted accordingly.

If everything seems ok, then now it is time to test and activate the LED light bar. If the lightbar is turning on without any problem, then Congratulations! You have just connected a LED light bar without any relay.


Wiring an LED light bar in front of a vehicle can make the view more transparent while driving at night.

However, it is a bit of a complicated process. But you can do it by following the guideline mentioned in this blog post.

If you think you can’t do it or don’t have any previous experience mounting LED lights, my suggestion would be to ask a professional for help who has prior expertise in this process.

I hope you have found the above information on how to wire led light bar without relay helpful. Now go and apply this step-by-step process to mount a led lightbar in your vehicle.

If you face any problems or have any confusion on this topic, let me know in the comment section below!




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