Learn how to wire a 12 volt relay with a detailed schematic diagram. This article provides step-by-step instructions and troubleshooting tips.. Relay Guide Overview What is a relay? A relay is essentially a switch that is operated electrically rather than mechanically. Although there are various relay designs, the ones most commonly found in low voltage auto and marine applications are electro-mechanical relays that work by activating an electromagnet to pull a set of contacts to make or break a circuit. These are used extensively.
Quick Summary: To wire a 12V relay, connect the 12V power source to Pin 30, the trigger control circuit to pins 85 and 86, the load to Pin 87, and, optionally, an alternative load to Pin 87a. I've included a couple of samples of how a 12V relay would be used together with circuit diagrams. 12V Relays. Wiring Diagram For Changeover Relay Changeover relay wiring how to wire a switch step by diagram vs load choose for medium voltage 12v msd 6200 ignition box dimmer no.