Wiring Products - How to Wire an Automotive Relay - YouTube Click to view on Bing2:04Instructions for wiring a standard automotive relay with descriptions of the pin-out and the schematic. I go over what each contact of the relay is for, and how to understand the schematic that is usually printed on the side of the Author: Wiring ProductsViews: 648K How To Wire A Relay Let's discuss how to wire a relay and go through the concepts of how a relay works. A relay is basically a switch but not like a switch that's on a wall. A wall switch relies on someone to flip it which will then control a light or some other type load. A relay is switched by electrical power and not a human. How To Wire a 4 or 5 Pin Relay - YouTube Click to view on Bing6:32In this video I show you how to wire a 12 volt automotive Bosch style relay. This video covers both 4 and 5 pin 12VDC relays. Best Connections - 12voltwire.c..Author: Rocky X TVViews: 306K Air Horn Wiring Diagram With Relay - Wiring Diagram Horn relay wiring diagram air reviews. Mounting bracket and hardware included with air compressor assembly kit and horn kit. How to wire a horn relay by kk. It is no longer an option of whether to replace the electrical horn. And air horn system. A simple system as the vehicle horn is not that simple any more. Switch and Relay Wiring – Circuit Wiring Diagrams Switches are pretty straight forward to wire, but problems may arise with multi-pole multi-way switches. Switch contacts are always drawn in the OFF position. In the case of rotary switches the wiper arm will always be connected to the first contact which will be the off position. The diagram below shows a 2 pole 4 way switch.