If you want to add a light bar to your vehicle, then you may have heard about using a 4 pin relay to control the on/off function. In this article, we will discuss the steps to wire a 4 pin relay for a light bar, along with some frequently asked questions about this process.
What is a 4 Pin Relay?
A 4 pin relay is an electromagnetic switch that is used to control circuits, including turning on and off lights. They are commonly used in automotive applications to control the power of auxiliary lights or accessories.
The pins on a 4 pin relay include:
| Pin | Description |
|---|---|
| Pin 30 | The power source that will be switched on/off |
| Pin 85 | The ground or negative connection |
| Pin 86 | The trigger or signal input |
| Pin 87 | The output connection that is switched on/off |
How to Wire a 4 Pin Relay for Light Bar?
Wiring a 4 pin relay for a light bar is a straightforward process that can be completed in a few steps:
Step 1: Mount the Relay
The first step is to mount the relay in a suitable position. This can be done using zip ties, brackets, or other fasteners. Make sure the relay is mounted securely and won’t move around while driving.
Step 2: Connect the Power Source
Connect the power source to Pin 30 on the relay using a suitable connector or wire. This can be a direct connection to the battery or a connection to a switch depending on your setup.
Step 3: Connect the Ground
Connect the ground or negative wire to Pin 85 on the relay. This can be connected directly to the chassis or to a dedicated grounding point.
Step 4: Connect the Trigger
Connect the trigger or signal wire to Pin 86 on the relay. This wire should be connected to a switch or other device that will provide the signal to turn the light bar on/off.
Step 5: Connect the Output
Finally, connect the output wire from the light bar to Pin 87 on the relay. This wire will be switched on/off by the relay depending on the signal input.
FAQs
Q: Can I wire a light bar without a relay?
A: It is possible to wire a light bar without a relay, but this is not recommended. A relay provides additional protection for the electrical system by preventing excessive current draw and voltage drops. It also allows you to control the light bar using a switch or other device.
Q: What gauge wire should I use for a light bar?
A: The gauge of wire required for a light bar will depend on the size and current draw of the light. As a general rule, 16 or 14 gauge wire is suitable for most light bars. However, if your light bar draws a higher current, you may need to use a thicker gauge wire.
Q: Can I use a 5 pin relay for a light bar?
A: Yes, it is possible to use a 5 pin relay for a light bar. However, a 4 pin relay is usually sufficient for most applications. The extra pin on a 5 pin relay is typically used for a separate ground connection, which may be useful in some setups.
Q: What is the purpose of the fuse in a light bar setup?
A: The fuse in a light bar setup provides protection for the electrical system by preventing excessive current draw in the event of a short circuit or other fault. It is recommended to use a fuse with a rating that matches the current draw of the light bar.
Q: Can I install a light bar on my own?
A: Installing a light bar on your own is possible, but it requires some knowledge of electrical wiring and automotive systems. If you are not comfortable with these tasks, it is recommended to seek the help of a professional installer.
Conclusion
Wiring a 4 pin relay for a light bar is a simple process that can be done in a few steps. By following the steps outlined in this article, you can safely and effectively control the on/off function of your light bar. If you have any further questions or concerns, consult with an expert to ensure proper installation and safety.
