Delving into the world of automotive and electrical systems often leads to encountering various wiring diagrams. Among these, the 86 relay wiring diagram holds a specific and crucial role. Understanding this diagram is key to troubleshooting and correctly installing components that rely on a relay for their operation. This article will break down what an 86 relay wiring diagram is and why it's so important.
The Role and Function of an 86 Relay Wiring Diagram
An 86 relay wiring diagram specifically refers to the schematic illustrating the connections for a four-pin relay, often called a standard automotive relay or a SPDT (Single Pole, Double Throw) relay. These relays are electro-mechanical switches that use a low-current circuit to control a high-current circuit. This allows a small signal to activate a larger electrical load, such as headlights, a fuel pump, or a starter motor. The "86" in the context of a relay wiring diagram typically denotes the terminal that receives the control voltage from the switch or computer that activates the relay. Understanding where this specific terminal connects is fundamental to ensuring the relay operates as intended.
The primary components you'll find depicted in an 86 relay wiring diagram include:
- The relay itself, usually represented by a symbol showing its internal coil and contacts.
- The power source for the high-current circuit.
- The load (e.g., light bulb, motor) that the relay will control.
- The switch or control module that triggers the relay.
- Ground connections.
The numbering system on a relay is standardized, with common terminal numbers including 30, 85, 86, and 87. The 86 terminal, as mentioned, is where the energizing signal is received. When current flows to terminal 86, it energizes the relay's coil. This energized coil then pulls an internal armature, which moves a set of contacts. The common terminal (usually 30) is then connected to a normally open (NO) terminal (usually 87) or, in some configurations, a normally closed (NC) terminal (often also labeled 87, but distinct in function or on a different pinout). This switching action is the core of the relay's purpose.
| Terminal | Common Function |
|---|---|
| 30 | Power Input (High Current) |
| 85 | Ground for Relay Coil |
| 86 | Control Signal Input (Energizes Coil) |
| 87 | Output to Load (Normally Open) |
Proper interpretation of the 86 relay wiring diagram ensures that the relay is wired to receive the correct control signal at terminal 86, that the relay coil has a proper path to ground (usually via terminal 85), and that the high-current path from terminal 30 is correctly routed through the switched contacts (terminal 87) to the intended load. Incorrect wiring can lead to components not functioning, blown fuses, or even damage to sensitive electronics. Therefore, a clear understanding of this diagram is essential for anyone working on electrical systems that utilize these common relays.
To effectively diagnose and implement changes to your electrical systems, it's vital to have access to accurate and detailed diagrams. The information you need to understand your 86 relay wiring is readily available in comprehensive automotive repair manuals or specific component installation guides.