How To Wire A Relay With A Switch

If you do not install a relay and use a switch you could end up overheating the switch melting the wires and reducing the current that is getting to your lights making them less bright.

How to wire a relay with a switch. See my switch terminology page for more on contact arrangements if you need to. The positive wire coming from the electric fan will connect to one of two red wires on your relay while the negative wire needs to go to ground. Using a relay can also shorten the distance that high current wiring needs to run. See all 8 photos.

What happens inside a relay isn t magic but it is important. Understanding how the relay works will help with diagnosis and modifications to vehicle systems. For anything above 30w we recommend installing a relay. Best connections 12voltwire c.

How to wire your light using a relay the relay will have 4 points on it marked 30 87 85 and 86. Spdt relay switch dpdt relay switch protective relays can prevent equipment damage by detecting electrical abnormalities including overcurrent undercurrent overloads and reverse currents. The factory wiring in modern cars is light gauge and is not designed for additional loads. Instructions for wiring a standard automotive relay with descriptions of the pin out and the schematic.

Buy relays pigtails and kits here. A relay can be used to power a new circuit with very little added current draw on the original wiring. Pin s 8 6 as normally open pin s 8 5 as normally closed. Wiring with a relay allows the power to run straight from the battery through the relay mounted nearby directly to the lights.

So when wiring up these relays the coil wire s will connect to pins 2 7 on the socket. See below for an example of a relay wiring diagram. The interior mounted switch only draws minimal power though the interior fuse block to activate the relay. In this video i show you how to wire a 12 volt automotive bosch style relay.

In addition relays are also widely used to switch starting coils heating elements pilot lights and audible alarms. How to wire a relay switch diagram wiring diagram is a simplified okay pictorial representation of an electrical circuit it shows the components of the circuit as simplified shapes and the capacity and signal connections between the devices. This video covers both 4 and 5 pin 12vdc relays.