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How to Connect a Power Relay

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Published on Apr 19, 2012

How to Connect a Power Relay

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Using a relay to supply power is a very common affair. The relay is wired to supply fuel injectors, ignition coils, motors and actuator components within an automotive system.

When connecting anything up to a car's factory wiring, always remember that factory wires are designed to carry the load of only the factory installed components. They are not generic power circuits like the power outlets in your home. The ignition circuit is designed to power the car's ignition system and nothing else. Connecting a high-current device to this circuit can create a fire hazard. By using a relay, you can use the any circuit in your car to control a high-current device without directly powering it from the circuit itself. In other words, use your car's component circuit to trigger the relay coil. Then, use a separate fuse to provide the power needed.

Before we analyze the circuit, there is a caveat that you need to know. All automotive ....

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