Light bars are a popular addition to many vehicles, particularly off-road vehicles like trucks and ATVs. The added visibility they provide can help keep you safe while driving in low-light conditions. However, properly wiring your light bar can be a bit tricky. One key component of the wiring process is the light bar relay. This article will provide you with everything you need to know about light bar relay wiring diagrams.
What Is a Light Bar Relay?
Before we dive into the wiring diagram, let’s first discuss what a light bar relay is and why it’s important. A relay is essentially an electrical switch that allows a low-current circuit to control a high-current circuit. In the case of a light bar, the low-current circuit is typically the switch that you use to turn the light bar on and off, while the high-current circuit is the power that runs to the light bar itself.
Without a relay, the switch would need to be able to handle the full electrical load of the light bar, which can be quite significant. This would require a large and expensive switch, and could also lead to problems with overheating and other issues. By using a relay, you can keep your switch small and affordable, while still safely controlling the power to the light bar.
Wiring Diagram Basics
Now that you understand the importance of the relay, let’s take a look at a basic wiring diagram for a light bar with a relay:
| Wire Color | Function |
|---|---|
| Red | Power (from battery) |
| Black | Ground (to chassis) |
| Yellow | Switched Power (from switch) |
| Orange | Load (to light bar) |
As you can see, there are four wires involved in the wiring diagram: red, black, yellow, and orange. Let’s break down the function of each wire:
- Red: This wire provides power to the relay from the battery. It should be connected to the positive terminal of the battery using a fuse.
- Black: This wire provides a ground connection for the relay. It should be connected to a clean metal surface on the vehicle’s chassis.
- Yellow: This wire carries the switched power signal from the switch to the relay. This wire should be connected to the switch’s output.
- Orange: This wire carries the load (i.e. power) from the relay to the light bar. It should be connected to the positive input on the light bar.
Wiring the Relay
Now that you understand the basic wiring diagram, let’s take a closer look at how to actually wire the relay. Here are the steps:
- Mount the relay in a secure location that is close to the battery and light bar.
- Connect the red wire to the positive terminal on the battery, using a fuse rated for the load of the light bar.
- Connect the black wire to a clean metal surface on the vehicle’s chassis.
- Connect the yellow wire to the output of your switch.
- Connect the orange wire to the positive input on the light bar.
- Turn on your switch and test the light bar to ensure that it works properly.
FAQs
Q: What gauge wire should I use for my light bar relay?
A: The gauge of wire you need will depend on the total amperage of your light bar. As a general rule, you should use at least 14-gauge wire for light bars that draw less than 10 amps, and 12-gauge wire for bars that draw more than 10 amps. Be sure to check the manufacturer’s specifications for your specific light bar.
Q: Can I use an existing switch for my light bar, or do I need to install a new one?
A: You can use an existing switch if it is rated for the amperage of your light bar. However, if your existing switch is not rated for the load, you will need to install a new one.
Q: What safety precautions should I take when wiring my light bar relay?
A: Always disconnect the battery before beginning any electrical work. Use a fuse to protect the circuit from overloading. And be sure to follow the manufacturer’s instructions carefully.
Q: Can I wire multiple light bars to one relay?
A: Yes, you can wire multiple light bars to one relay, as long as the total amperage of the bars does not exceed the maximum load of the relay.
Q: What should I do if my light bar doesn’t work after wiring the relay?
A: Check all connections and make sure they are secure. Make sure the switch is on. Check the fuse and replace it if necessary. And make sure the light bar is properly grounded.
Conclusion
Wiring a light bar can be intimidating, but with the right tools and knowledge, it doesn’t have to be. By using a relay, you can safely control the power to your light bar, and enjoy added visibility and safety when driving off-road. Just remember to follow the manufacturer’s instructions carefully, and to take all necessary safety precautions when working with electrical circuits.
