relay

  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 Why use a relay instead of a switch? Pin 30 + Pin 86 - Connect them both together to a fused 12V power source. Pin 87 - Sends power out to your accessory. 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