Adding an illuminated switch to your 12V circuit is a simple yet effective way to enhance the aesthetic of your system. Not only does it add a cool lighting effect, but it also helps you identify if the switch is on or off. In this article, we will guide you through the steps to wire a 12V illuminated switch and provide you with some useful tips along the way.
What is an Illuminated Switch?
Before we start, let’s first understand what an illuminated switch is. An illuminated switch is a switch that lights up when turned ON. It usually has a small LED light inside the switch that glows brightly when the switch is ON, making it easy to identify when the switch is in use. These switches are commonly used in vehicles, boats, and other 12V applications.
Types of Illuminated Switches
There are two types of illuminated switches: SPST (Single-Pole Single-Throw) and SPDT (Single-Pole Double-Throw). The SPST switch has two terminals: one for the power source and the other for the load. When the switch is ON, the power flows through the switch to the load. The SPDT switch has three terminals: one for the power source, one for the load, and one for the ground. The middle terminal connects either to the power or the ground, depending on the switch’s position.
Now that we have a basic idea of what an illuminated switch is and its types, let’s move on to wiring the switch.
Wiring the Illuminated Switch
The wiring of the illuminated switch is fairly simple. Here are the steps to follow:
- Identify the power source: The first step is to identify the power source for the switch. It can be the battery, a fuse box, or any other power source in your circuit.
- Prepare the wires: Cut two wires of equal length and strip about 1/4 inch of insulation from both ends of each wire.
- Connect the first wire: Connect one end of the first wire to the power source. You can use a crimp connector or a soldering iron to connect the wire.
- Connect the second wire: Connect one end of the second wire to the load. Again, you can use a crimp connector or a soldering iron to connect the wire.
- Connect the switch: Connect the other end of both wires to the switch. Make sure to connect the wire going to the power source to the terminal labeled “Power” or “Battery,” and the wire going to the load to the terminal labeled “Load.”
- Connect the LED: If your switch has an LED, connect the LED to the switch. The LED usually has two legs that need to be connected to the switch terminals. Make sure to connect the LED legs to the terminals labeled “+LED” and “-LED.”
- Test the switch: Before closing everything up, test the switch to make sure it works properly. Turn ON the switch and make sure the LED lights up. Turn OFF the switch and make sure the LED turns off.
Wiring Diagram
Here’s a simple wiring diagram for a 12V illuminated SPST switch:
| Terminal | Description | Wire Color |
| 1 | Power | Red |
| 2 | Load | Black |
| 3 | +LED | Green |
| 4 | -LED | Yellow |
Tips and FAQ
Tip 1: Use the Right Gauge of Wire
It’s important to use the right gauge of wire when wiring a 12V illuminated switch. The gauge of wire you need depends on the amperage of your circuit. In general, 16-gauge wire is sufficient for most 12V circuits. However, if your circuit draws more than 10 amps, you should use a thicker gauge wire.
Tip 2: Always Use a Fuse
When wiring any 12V circuit, you should always use a fuse to protect your system from electrical damage. The fuse should be rated according to the amperage of your circuit. It’s recommended to use an inline fuse holder for easy replacement.
FAQ
Q: Can I use an illuminated switch for AC circuits?
A: No, illuminated switches are designed for 12V DC circuits only. Using an illuminated switch for AC circuits can cause electrical damage or fire.
Q: Can I use an illuminated switch for high amperage circuits?
A: No, illuminated switches are not designed for high amperage circuits. If your circuit draws more than 10 amps, you should use a heavy-duty switch instead.
Q: Can I install an illuminated switch in a vehicle?
A: Yes, illuminated switches are commonly used in vehicles, boats, and other 12V applications. Just make sure to follow the proper wiring guidelines and use the right gauge of wire.
Congratulations, you have successfully learned how to wire a 12V illuminated switch. Now you can add some cool lighting effects to your 12V circuit while also making it easier to identify when the switch is in use.
