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Automotive Relays

The most common application of automotive relays; is to switch a high current circuit, using a low current circuit.

This application comes into play whereby, an in-line switch does not have the capacity; to handle the current required to switch a high current electrical system.

For example, this scenario could be observed during the operation of, a fuel pump or engine cooling fan.

So, a key advantage of using automotive relays is; that it allows the activation of multiple circuits, from a single switch. As a result, a single input within an electrical system, can be used to activate and trigger; multiple relays installed in an electrical circuit. These automotive relays can then complete/ break multiple circuits and therefore; execute multiple functions, given a single input signal.

A simple real life example, from a single switch is; the central locking system in a car. A single button press, results in all the door locks, locking or unlocking. Simple, time-saving and effective. And, most of the time, not even thought off.

The Fastest Way, To Test Automotive Relays

One of the fastest ways to test a relay is, firstly, remove the suspected relay. Put the new relay of the same size, shape, and pin arrangement.

TIP: Sometimes there is more than one relay, in your fuse box; with the same configuration, as the suspect one. If so, remove and try that relay first. You could make the diagnosis. that much faster.

Check if the accessory works, if yes. Then the original automotive relays is bad.

Thank You !

Cooling Fan Relay - What Does It Do - Failure Symptoms - Testing
Automotive Relays

Cooling Fan Relay – What Does It Do – Failure Symptoms – Testing

11/11/2022

The cooling fan relay essentially functions as, the on/off switch for the engine’s cooling fans. And, is therefore an important electrical component, of the vehicle’s cooling system. Most cooling fans use electric motors, that have […]

Automatic Shutdown (ASD) Relay - Function - Failure - Testing
Automotive Relays

Automatic Shutdown (ASD) Relay – Function – Failure – Testing

08/11/2022

The function of the automatic shutdown (ASD) relay, is to shut off power to major systems. When the key is turned off, as a safety feature. So, when the automatic shutdown (ASD) relay is on; […]

Fuel Pump Relay - Function, Failure and testing procedures.
Automotive Relays

Fuel Pump Relay – Function, Failure and testing procedures.

03/19/2022

So, the fuel pump relay, is activated whenever, the ignition is turned on. Consequently, the primary function of the fuel pump relay, is to maintain a consistent voltage supply, to the fuel pump. Therefore, when switched […]

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