Homemade Electric Fence Indicator Light

By displaying an electric fence light, passersby can avoid high voltage shocks and allow owners to check on their fences from a distance. You can make a fence indicator light at home or buy it online or from the market. DIY fence indicator lights can be easily made using a bulb, so you don’t require costly equipment. But ensure that the bulb you use is rated for high voltage pulses.

To make an electric fence indicator light, you’ll need a low-voltage bulb or LED, a resistor, wires & a soldering iron for joining metal components.

Read the complete guide below:

Homemade Electric Fence Indicator Light

  1. Determine the voltage of your electric fence. You’ll need to know this to choose the right bulb & resistor.homemade electric fence indicator light bulb
  2. Use a low-voltage bulb(5-10V) to consume less power from your fence.
  3. You can connect the bulb to the fence circuit without a resistor, but a resistor will save the bulb from pulsating current & ultimately from blowing.
  4. Take two wires and connect/solder them at both resistor pins. Now, solder one end of this wire to the bulb’s metal base(live terminal) and hook the other end to the live fence wire.
  5. Now take another wire, solder one end to the bulb’s round metal shell, and tie the other to the ground rods or the energizer’s ground terminal.
  6. To prevent all the hustle, you can use a light socket with wire and place the resistor between the live wire of the socket. Then, tie the bulb socket’s live wire to the fence wire & the neutral(ground) wire to the ground rods.

Voltage pulse through the live wire enters the bulb and then leaves to the ground, completing the circuit. With each voltage pulse, the bulb will blink.

How does a homemade electric fence indicator light work?

When the fence charger generates a voltage pulse, the bulb will feed energy through the live fence wires and illuminate.

The ground terminal of the bulb is connected to a ground component (ground wire, ground rod, or energizer ground terminal). Hence, the current returns back to the fence circuit.

The most crucial step while making a homemade electric fence indicator light is to use a resistor between the live fence wire and the bulb to ensure the safety and reliability of the bulb & circuit.

Follow the complete step-by-step guide below.

Step 1: Material required:

LED or any low-voltage bulb.

  1. Resistor(according to fence power & bulb’s input).
  2. High voltage supportive wires.
  3. Soldiering iron & electrical tape.

Step 2: Choose the right bulb:

Any bulb attached to the fence will drain some power. The higher the bulb’s input voltage and amps, the more power will be drained from your fence. So, try to use a low-voltage bulb(10V) that can withstand the high voltage of the electric fence. Ensure the bulb is compatible with the fence’s fluctuating & high voltage(KV).

LED bulbs consume less power and are ideal if you want minimum power loss for your fence. Neon bulbs can consume slightly more current but work well at high voltage and are visible(illuminates) from greater distances. Strobe light bulbs are designed for high voltage; hence, they can bear 8-10kV voltage in fences.

Tip: Opt for red, yellow, or warm(metallic) colour light as they offer better visibility.

Step 3: Choose the correct resistor:

A resistor is quite essential when making a homemade electric fence indicator light. The resistor will regulate the voltage(current) going to the bulb and protect it from damage. Additionally, the resistor will ensure that the LED emits a consistent and steady light.

When choosing a resistor, you must select one with the appropriate resistance value to match the voltage and current of your electric fence and LED bulb.

The resistance value can be calculated using Ohm’s law, which is based on the voltage and current requirements of the LED bulb.

The formula is resistance (ohms) = voltage difference / current (bulb’s amps).

For example: If your fence voltage is 5000V volts and the bulb is 10V, and it consumes 20 milliamps of current, the resistor value needed would be around 300k ohm.

Step 4: Setup a DIY fence indicator light:

We’ll attach a bulb to the live and ground wires of the fence. Voltage pulse enters through the fence to the bulb and then back to the energizer through the grounding.

  1. Take a bulb with two long wires long enough to reach from the bulb to the fence wires & a ground component(earth or any grounding part).
  2. Cut a wire into two and solder the resistor between both pieces of wire. Resistors don’t have a negative or positive terminal, so you can use them on any side.
  3. Now take a soldering iron & join one end of the wire(attached to the resistor) to the bulb’s bottom metal tab (live terminal). Hook(knot) the other end of the same wire to a live fence wire.
  4. Similarly, solder the other wire to the bulb’s ground terminal (round metal shell) & hook the other end to any ground terminal.
  5. Tie the other end of the wire to the ground rods.
  6. You can attach the bulb’s ground to any ground part of your fence, i.e., ground rods and wires. Soil also acts as the grounding of the fence circuit.

Tip: Place the indicator light near the ground rods and a corner post. Ensure the animals can’t reach the fence indicator light, as they may damage it.

Some bulbs have two pins/terminals; you can attach them to the fence in any direction.


Red light bulbs can be seen at a longer distance, especially at night.

Other fence Indicator tools available in the market:

  • An electric fence alert is quite a helpful tool to check if there is power in the fence & use it as a warning sign. They are available both in wired & wireless models. The wired electric fence alert light gets hooked to the live fence wire. They have a black probe with a metal pin that is pinched into the ground. The tester indicates the current in the fence with reference to the ground. Wireless electric fence indicators are just hooked to the electric fence wire without requiring a ground connection. A red bulb glows inside the fence indicator light that’s visible up to a kilometer.
  • Pulsar Electric Fence Light is also an excellent tool as it draws very little power. It has seven high-intensity LEDs that glow with a voltage pulse. Pulsar has 2 thin wires; connect them to the fence live wire and any grounded component (soil, earth stakes, or ground wires).
  • A pilot lamp indicator is cheap(up to 5$), have around 50,000 life hour, and works well at low amperage. Simply solder wires at both terminals or use alligator clips. Attach one wire to the live fence wire and the other to the grounding of the fence circuit.

Tip: If you have a continuous power fencer, indicator tools will be damaged too quickly.


Installing a fence indicator is easy; attach the bulb’s round metal shell to the fence and the base to the ground part of the fence. Using a low-power bulb will drain less energy from your fence. You can also install fence indicator tools available in the market, ranging from $ 10 to $ 30.

If you still need guidance or have a better idea, share it with us.

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