If you are new to relay wiring, then you might be wondering what the “86 relay wiring diagram” is all about. This article will guide you through the basics of this type of wiring and how it can be used in various applications. We will also provide a detailed diagram, tables and FAQ to help you understand the concept better.
What is an 86 Relay?
An 86 relay is a type of electromagnetic switch that is used to control high current electrical circuits. It consists of two circuits: the control circuit and the load circuit. The control circuit is the low current circuit that operates the relay, while the load circuit is the high current circuit that is controlled by the relay.
The 86 relay is commonly used in automotive applications, such as controlling the headlights, horn, fuel pump, and other accessories. It is also used in industrial and home automation systems, HVAC systems, and security systems.
How Does 86 Relay Wiring Work?
The 86 relay wiring diagram consists of several components, including the relay itself, a power source, a load device, and a control device. The power source is usually a battery or an alternator, while the load device is the electrical component that needs to be controlled. The control device can be a switch, a sensor, or a computer control module.
When the control device sends a signal to the relay, it activates the electromagnetic coil inside the relay. This causes the contacts to close, allowing current to flow through the load circuit. When the control device stops sending the signal, the coil de-energizes, and the contacts return to their normal position, cutting off the current flow.
86 Relay Wiring Diagram
Below is a typical 86 relay wiring diagram for controlling a set of headlights in a vehicle:
| Terminal | Color | Description |
|---|---|---|
| 85 | Black | Ground |
| 86 | Yellow | Control Signal |
| 87 | Red | Positive Terminal of Load Circuit |
| 87a | Blue | Negative Terminal of Load Circuit |
In this diagram, the control signal is sent from the headlight switch to terminal 86 of the relay. This activates the relay, which closes the contacts between terminals 87 and 87a. This allows current to flow from the battery, through the relay contacts, and to the headlights. The ground for the control circuit is provided by terminal 85 of the relay.
FAQ
1. Why is an 86 relay used?
86 relay is used to control high current electrical circuits which are generally not possible to control directly by lower power devices. It is commonly used in automotive applications, such as controlling the headlights, horn, fuel pump, and other accessories. It is also used in industrial and home automation systems, HVAC systems, and security systems.
2. What is the difference between 86 and 87a relay?
The 86 and 87a terminals on a relay are both part of the load circuit in the relay. The main difference between them is that 86 is the control signal input while 87a is the normally closed contact of the relay. When the relay is not energized, the contacts between 87 and 87a are closed, and the contacts between 30 and 87a are open.
3. How do I test an 86 relay?
Testing an 86 relay is relatively simple. You will need a multimeter with a continuity function. First, check the resistance across the coil terminals (85 and 86) using the multimeter. The reading should be within the range specified in the relay datasheet. Then, test the continuity of the contacts (87 and 87a) using the multimeter. The reading should be open when the relay is not energized, and closed when it is energized.
4. Can an 86 relay be used as a switch?
Yes, an 86 relay can be used as a switch to control various electrical systems. However, it is important to ensure that the relay is capable of handling the current and voltage requirements of the load circuit. If the relay is not designed for the specific application, it may fail or cause damage to the electrical system.
5. How do I wire an 86 relay?
To wire an 86 relay, connect the control signal wire (typically from a switch or sensor) to terminal 86. Connect the ground wire to terminal 85. Connect the positive wire of the load circuit to terminal 87, and the negative wire to terminal 87a. Ensure that the wiring is properly insulated and secured to avoid short circuits or electrical hazards.
Conclusion
The 86 relay wiring diagram is a crucial part of many electrical systems, including automotive, industrial, and home automation systems. It allows for efficient and reliable control of high current electrical circuits, and can be used in a variety of applications. We hope that this article has provided you with a clear understanding of this type of wiring, and has helped you in your electrical projects.
