What is a relay for headlight?
A headlight relay is an electric device used to control the headlight circuit of a car. A headlight relay usually consists of an electromagnetic coil and one or several sets of contacts. When the coil is energized, it generates a magnetic force that pulls either to open or to shut the contacts. By the contact's changeover, power feeding is supplied to the headlights.
Headlight wiring is important.
First, there is assurance of safety. Proper wiring of the headlights will ensure that they function correctly; giving good lighting to drivers in conditions of low visibility or adverse weather. This allows drivers to see clearly the road and pedestrians, thus reducing chances of accidents.
The second is circuit protection. Reasonable wiring can help to avoid circuit overloads and a short circuit. If wiring is not done right, the front lights can have high levels of power. It can make wires and cables overheat or even catch fire. It could even burn a vehicle's electric system. Correct wiring can protect circuits and electric components of the vehicle and guarantee stable current.
Materials Required
Switch, connector terminal, crimping or screwdriver tool, relay, fuse and fuse holders, etc.
Safety precautions
- Have a basic understanding of circuits: To ensure that the right relay and wires are selected, you need to be familiar with the electrical system of your vehicle, including voltage and current.
- Preparing the right tools: Professional electrical tools, such as wire stripping, crimping, screwdrivers and so on, are essential to ensure that the tools perform well in terms of insulation, and prevent electric shock accidents.
- Specifications for wire connections: Use the right connection methods (welding, crimping, etc.) to ensure good conductivity and a strong connection. Avoid loose wires and poor contact that can cause sparks, fires, or heating.
How to Connect Headlight Receptacle Steps
Step 1: Determine What Type of Headlight Relay You Are Going to Use
Use the proper and efficient headlight relay if your car requires higher power and more circuits in order to light up its headlights. Choose a headlight relay, taking into consideration its rated voltage, current, and other parameters so as to have good and safe control of the headlights.
Step 2: Find the Headlight Wiring
You can find wiring for the headlight of your vehicle from its maintenance manual or at different places such as the engine compartment and below the dash board. Locate the position of the ground, power and control wires in the headlight.
Step 3: De-connect power supply
De-connect the power supply of the vehicle before doing any electrical connection. Disconnection of vehicle power supply will save you from an electric shock and short circuit.
Step 4: Relay Connection
Install the relay at the proper location. Make sure it gets properly attached and does not loosen up during the running of the vehicle.
As per marking on the relay, connect the power cable of the headlight. Always keep appropriate tools and terminals for a good connection.
Also, connect the ground wire to the grounding contact on the relay. Ensure that the wire is tightly connected both to the ground and to the relay.
Step 5:Connect the headlight switch and the relay
- The control wire is usually a thin, flexible wire.
- Connect this to the relay contact - usually marked "control" or "switch". When the headlight switch is on, current will trigger the contact of the relay - labeled "control" or "switch", hence closing it.
Step 6: Connect power and ground to the relay
- Connect a power cord to the power contact input of the relay. This is usually labeled "+", or other symbol, indicating the same thing. This line may have a fuse placed in it to prevent overload.
- Insulate the cord properly attached with insulating tape, heat shrink tubing, or both.
- Connect the ground wire to vehicle grounding, usually a metal part of the car or a grounding bolt. To have the circuit work, you must have a good connection.
Step 7: Check your Wiring
- Check all the connections to ensure no wire is loose or faulty.
- Also, check that the relay mount is secure and wiring is correctly laid out so as to avoid friction or interference.
- Multimeter useful device, in order to check voltage and continuity within a circuit.
- Connect the negative terminal towards the vehicle battery and check the headlights.
Front headlight relay wiring diagram and video
The wiring diagram comes from：www.humanspeakers.com
If you are not very familiar with this, we have a video here. I hope it can help you
There are several benefits of connecting a headlight relay.
1. Protection of the headlight switch
The wear on the switch is reduced. Normally, the high-powered headlights, when directly controlled by the switch, require the switch to support a large amount of current. Once the relay is connected, the switch will only need to control the low-current relay coil. This reduces the wear on the switch contacts.
2. Improvement in circuit reliability
Stable current supply. The relay can control the current which switches on or off the headlights in order to guarantee the headlight stable current when the working conditions vary. In that case, even though the vehicle's electrical system suffers from fluctuations, the headlight will work normally under the guarantee of the relay. Besides, it enhances the reliability of the circuit.
3. Realize automatic control
The connection of the relays makes the implementation of the automatic control functions easier. All these improve the driving safety and convenience.
4. Improve security
Check to see if your headlights work. A good headlight is very important in driving safely at night or during rainfall. Connecting relays upsurges the reliability and stability of the operation of the headlight. This reduces the safety hazards brought about by headlight failures.
conclusion
How to wire a headlight relay,Following the steps above and the wiring diagram of the headlight relay can ensure that you can solve your problem perfectly. If you need to purchase high-quality headlight relays, you can click to contact us and we can provide you with a solution.
