12v Automotive Relay Wiring Diagram

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Automotive relays are for use in 12 volt electrical systemsrelays are used when you need to switch higher currents than a switch can handle or when you want to isolate an electrical circuit. Instructions for wiring a standard automotive relay with descriptions of the pin out and the schematic.

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The factory wiring in modern cars is light gauge and is not designed for additional loads.

12v automotive relay wiring diagram.
Some people may ask why they should bother using a relay when you can just wire an accessory directly through a switch to its power source.
87 and 87a are the two contacts to which 30 will connect.
Using relays in automotive wiring.

12v automotive relay wiring diagram automotive relay guide relay guide overview what is a relay the following diagrams show some mon relay wiring schemes that use 4 pin iso 12 volt planet auto marine relay diagrams quick reference car alarm car stereo how to wire relays and relay diagrams a quick reference of dozens of automotive relay.
If the coil is not activated 30 will always be connected to 87a.
Relays are a mechanical device that can connect or disconnect power to an accessory when it gets a low voltage signal from a switch.

Spst relay single pole single throw relay an electromagnetic switch consist of a coil terminals 85 86 1 common terminal 30 and one normally open terminal 87it does not have a normally closed terminal like the spdt relay but may be used in place of spdt relays in all diagrams shown on this site where terminal 87a is not used.
Using a relay can also shorten the distance.
The real benefit behind a relay is more than automation.

Automotive relay diagram relays relays are switches controlled by electrical power like another switch computer or control module.
Note that each pin is numbered.
85 and 86 are the coil pins while 30 87 and 87a are the contact pins.

Automotive relay guide img source.
Looking at the diagram we see the pinout of a typical 12v relay.
Although there are various relay designs the ones most commonly found in low voltage auto and marine applications are electro mechanical relays that work by activating an electromagnet to pull a set of contacts to make or break a circuit.

A relay can be used to power a new circuit with very little added current draw on the original wiring.
If you need a relay diagram that is not included in the 76 relay wiring diagrams shown below please search our forums or post a request for a new relay diagram in our relay forum.
Every circuit added to a modern car should be run through an automotive relay.

A relay is essentially a switch that is operated electrically rather than mechanically.
The purpose of a relay is to automate this power to switch electrical circuits on and off at particular times.
Numbers of a relay.

What is a relay.
Dozens of the most popular 12v relay wiring diagrams created for our site and members all in one place.

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