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Automotive Relay Diagram

A blade or ceramic fuse is connected between terminal 30 and the NO contact, providing built-in protection for the high current circuit. The fuse is normally mounted in a holder moulded as part of the relay body so it can be replaced if it blows.


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Relay with diode across the coil. A high value resistor performs a similar function to that of the diode in the previous configuration by absorbing the high voltage spikes created by the collapsed magnetic field on de-energisation of the coil. The disadvantage of a resistor is that it allows a small current to flow in normal operation of the relay unlike a diode and is not quite as effective as a diode in suppressing voltage spikes, but it is less susceptible to accidental damage because resistors are not sensitive to polarity i.

ISO micro relays are, as the name suggests, smaller than ISO mini relays and designed for use in applications where space is at a premium. They are rectangular in section and narrower than a mini relay with a slightly different pin layout, and are typically available in 'make and break' and 'changeover' configurations, with and without suppression diodes.

There are other relay designs that are used for some more complex applications in vehicle systems. They are still based upon the principle of switching higher current circuits using smaller current circuits but often combine this with electronics to perform special functions: Some examples are:. These more complex relays can have up to 9 pins of various sizes. This increase in the number of terminals over the standard 4 or 5 in more simple relays is often necessary because additional connections can be required for the in-built electronics e.

This simple circuit uses the power feed to the headlight main beam bulb as the trigger to energise a relay. The high current circuit in this relay feeds power to the driving light bulb, so every time headlight main beam is selected, the coil is energised and the driving lights operate. Note: It is important that the new power feed to the driving lights is fused appropriately see our Knowledge Centr e fusing guide.

Related Wiring Diagrams

Tip: It is a good idea to use a separate relay for the left and right hand driving lights and have them switched independently from the left and right hand main beams. This way, if a relay on one side fails the driving light on the other side will still work. Adding a buzzer that warns when you've left your headlights on.

This circuit is designed to alert you that you've left your lights on by activating a buzzer when you open the driver's door. If the headlights are on and the driver's door is opened, the door switch will complete the coil circuit which will complete the high current circuit to the warning buzzer. A warning light could easily be added in parallel to, or used instead of, the buzzer. Also connects in parallel to terminal This is a clever little circuit involving two relays and a momentary switch and is more a of a 'logic' circuit than one used to switch a high current with a low current.

Once the ignition key is in the IGN position, you press and release the momentary switch and then turn the key to the START position and fire the engine as normal.


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  • This has the effect of keeping the coil energised after the button is released note that whilst the button is pressed there is 0V between terminals 86 and Terminal 87 also sends power to the coil of Relay 2 which enables the starter motor solenoid connection, ready for when the key is turned to the START position. When the ignition is turned off the power to the coil of Relay 1 is cut which cuts the power to the coil in Relay 2 and breaks the starter motor solenoid circuit, so the engine cannot be started again without going through the above routine.

    The momentary switch can be mounted out of sight and acts a simple starter inhibit security device.

    1. Relay Drive by Means of a Transistor

    This supply also feeds the other side of the momentary switch. Need some hints, tips or guidance on 12V electrics? Visit our Knowledge Centre for a wealth of useful information. Watch our YouTube "how to" guides here. The principles of environmental conditions, the relay selection.

    The principles of safety parameters Relay. The usefulness of automotive relays. Why to add the relay and the car insurance? What is Automotive Relay Automotive relay output parameter selection principle Automotive relay selection principle of input parameters Automotive Relay What role in the car Car circuit design, how to choose the relay?


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    6. Automotive relay selection principle of input parameters - Auto Relays!

    Relay installation, use the selection principle Relay on the car were four columns are What's the name Relay time parameter selection principle The classification of automotive relays The principles of environmental conditions, the relay selection The principles of safety parameters Relay The usefulness of automotive relays Why to add the relay and the car insurance?

    If we were to open a relay, you would see an electromagnet coil, the contacts, and a spring. The spring holds the contact in position until a current gets passed through the coil.

    Using Relays in Automotive Wiring

    The coil then generates the magnetic field which moves the contact on and off. Looking at the diagram, we see the pinout of a typical 12V relay. Note that each pin is numbered. If the coil is not activated, 30 will always be connected to 87a. You can think of this as the switch in OFF.

    follow url When current is applied to the coil, 30 is then connected to pin You can wire relays to be either open or closed, depending on how you need your accessory to operate. If you want a normally closed relay, you will want to wire to 87a.