Wiring Diagram Automotive Relay

As in the diagram a wire is run from a 12 volt power source to the switch in the cab and out to the relay placing a fuse at the source of the power.

Wiring diagram automotive relay.
Wiring diagram a 12 volt automotive relay best the12volt wiring.
You can wire relays to be either open or closed depending on how you need your accessory to operate.
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How to wire a.
Although most relays are labeled at the bottom you can always find the 30 pin set.
The real benefit behind a relay is more than automation.

Follow the relays wiring schematic when connecting the wires to the relay one of the relays terminals goes to ground.
Instructions for wiring a standard automotive relay with descriptions of the pin out and the schematic.
The purpose of a relay is to automate this power to switch electrical circuits on and off at particular times.

If you want a normally open relay you will wire to 87.
Relays are a mechanical device that can connect or disconnect power to an accessory when it gets a low voltage signal from a switch.
The automotive iso mini relays we have been looking at above are typically available in two types of pin layout designated type a and type b layouts.

If you want a normally closed relay you will want to wire to 87a.
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Automotive relay diagram relays relays are switches controlled by electrical power like another switch computer or control module.
Using a relay can also shorten the distance.
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.

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A relay can be used to power a new circuit with very little added current draw on the original wiring.

12 volt wiring gauge.
The factory wiring in modern cars is light gauge and is not designed for additional loads.
Every circuit added to a modern car should be run through an automotive relay.

Using relays in automotive 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.
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Dozens of the most popular 12v relay wiring diagrams created for our site and members all in one place.

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