12 Volt LED Wiring Diagram

LED (Light Emitting Diode) lights have revolutionized lighting technology by providing more energy-efficient and long-lasting lighting solutions. However, their installation may not be as simple as traditional incandescent bulbs. Proper wiring is essential for effective operation and to prevent any safety hazards. In this article, we will provide a detailed guide on wiring 12 Volt LED lights.

What is a 12 Volt LED Light?

12 Volt LED lights are low voltage lights that operate on 12 volts DC (Direct Current) power. They are commonly used in automotive, marine, and RV applications due to their reliability, energy efficiency, and durability.

Advantages of 12 Volt LED Lights

There are several advantages of using 12 Volt LED lights:

Advantages Description
Energy Efficiency LED lights consume less energy than traditional incandescent bulbs, which saves on energy costs and extends battery life in mobile applications.
Durability LED lights are solid-state devices that are more resistant to shock, vibration, and extreme temperatures than incandescent bulbs.
Longevity LED lights have a longer lifespan than traditional bulbs, which reduces maintenance costs in the long term.

Wiring 12 Volt LED Lights

Wiring 12 Volt LED lights involves connecting them to a power source and a switch or dimmer. The steps below provide a general guide on wiring 12 Volt LED lights:

Step 1: Choose the Right Wire

Choosing the right wire is crucial to ensure proper functioning of the LED lights. The wire should be rated for at least 18 AWG (American Wire Gauge) and should be able to handle the current load of the LED lights. It is recommended to use stranded wire instead of solid wire for flexibility and durability.

Step 2: Connect the Positive and Negative Wires

Each LED light has a positive and negative terminal that must be connected to the power source. The positive wire is usually red or has a “+” symbol, while the negative wire is usually black or has a “-” symbol.

Step 3: Connect to a Power Source

12 Volt LED lights can be powered by a battery, power supply, or solar panel. The power source should be rated to provide the required voltage and current for the LED lights. It is important to use a fuse or circuit breaker for safety.

Step 4: Connect to a Switch or Dimmer

A switch or dimmer can be used to control the LED lights. The switch should be rated for the voltage and current of the LED lights. The dimmer should be compatible with LED lights to prevent flickering or damage.

Step 5: Test the Wiring

Before mounting the LED lights, it is important to test the wiring for proper functioning. This can be done using a multimeter or a test light to check for continuity and voltage.


Q1: Can I use a resistor with 12 Volt LED lights?

A1: Yes, a resistor can be used to control the current flow to the LED lights and prevent overheating. The resistor should be calculated based on the voltage and current of the LED lights and the power source.

Q2: How do I calculate the resistor value for 12 Volt LED lights?

A2: The resistor value can be calculated using Ohm’s law, which states that resistance (R) = voltage (V) / current (I). For example, if the LED lights require 12 volts and 100 mA (milliampere) of current, the resistor value would be R = 12 / 0.1 = 120 ohms.

Q3: Can I connect multiple 12 Volt LED lights in parallel?

A3: Yes, multiple 12 Volt LED lights can be connected in parallel as long as the total current draw does not exceed the capacity of the power source and wiring. However, it is recommended to use a separate resistor for each LED light to ensure uniform brightness and prevent overloading.

Q4: Can I use a 12 Volt AC power source for LED lights?

A4: No, 12 Volt LED lights require a DC power source because they have a built-in diode that only allows current flow in one direction. Using an AC power source can damage the LED lights and pose a safety hazard.

Q5: What is the lifespan of 12 Volt LED lights?

A5: The lifespan of 12 Volt LED lights depends on several factors, such as the quality of the materials and manufacturing, the operating conditions, and the frequency of use. On average, LED lights can last between 25,000 to 50,000 hours, which is much longer than traditional bulbs.


Wiring 12 Volt LED lights may seem challenging at first, but with proper planning and the right tools, it can be a straightforward process. Remember to choose the right wire, connect the positive and negative wires, use a suitable power source and switch, test the wiring, and follow safety precautions. With these steps in mind, you can enjoy the benefits of energy-efficient and long-lasting lighting solutions.