How To Wire a 4 or 5 Pin Relay With a Negative Trigger Wire.

In this video, I explain why it is necessary to use a relay in a circuit. I then demonstrate how to wire a 5 pin relay with a negative trigger wire. The benefits of using a negative trigger wire on a 5 pin relay would be - one less power wire going to the relay, and not needing a power wire feeding your switch. This may be beneficial depending on what type of accessories you are wiring into your car or truck. You could use this method for a radiator fan, fuel pump, headlights fog lights, spot lights, LED lights and probably hundreds of other uses.

How to wire a relay with a negative switch
00:00 Why use a relay instead of a switch?
1:00 Pin 30 + Pin 86 - Connect them both together to a fused 12V power source.
1:31 Pin 87 - Sends power out to your accessory.
1:59 Pin 85 - Connect to the switch, with the other side of the switch going to ground.

Pin 30 - Incoming 12v to the relay from the battery (fused)
Pin 86 - incoming 12v to the relay from the battery (fused) - Tied in with Pin 30
Pin 87 - Outgoing power from the relay to the electric accessory (lights, pump, fans, etc)
Pin 85 - Negative trigger wire to turn on the relay. Should be connected to a switch. The other side of the switch should connect to a ground.
Pin 87a - Empty

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