This is a how-to video for wiring a 5 pin Bosch-style Automotive relay. I've created an actual circuit for you to follow along with, and I explain how they w.. 5 Pin Relay 5 pin relays provide 2 pins (85 & 86) to control the coil and 3 pins (30, 87 & 87A) which switch power between two circuits. They have both normally open and normally closed connection pins. When the coil is activated, power will be switched from the normally closed pin to the normally open pin.
Th above image shows the difference between Type A and Type B relays. Note that these two types are available for both 4-Pin relays as well as 5-Pin relays. Relay Wiring Diagram. Now that we have seen the important terminology associated with relays and also the pins, let us now take a look at some commonly used relay wiring diagrams.. Wiring a 5 blade relay may seem like a daunting task, especially if you're not familiar with electrical systems. However, with the right tools and knowledge, it can be done easily and safely. This step-by-step guide will walk you through the process of wiring a 5 blade relay, complete with a diagram to help you visualize the connections.