Trucks / Relays
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Principle of operation and performance of relays of trucks
Every electrical system of light-duty and heavy-duty trucks, has many electrical relays. These so-called control relays are used as a switch that uses an electrical signal to activate them. Once activated, the relay creates an electrical connection to power any accessory.
These accessories can range from mainframe PCM (control unit) to the fuel pump on the truck. Most relay controls work on the same principle, although some configurations may vary.
The easiest option to determine whether there are problems in the electrical system caused by the relay is to replace it with a new one. If after placing the new relay, the problem persists, you need to check the circuit that triggers the relay with the necessary equipment and tools. In general, relays of each vehicle from car to heavy truck can be broken up due to higher temperature, bad contact, short circuit and others.
The first half of the relay uses an electromagnet to close the secondary circuit within the interior of the relay. This solenoid is activated by positive and negative power (+ and -), similar to the circuit of an illuminating light bulb. The second half of the relay switch controls power to the established specific accessory like fuel pump, ignition system, and more.
Activation of the primary side of the relay can be done manually, for example, headlight switches on the dashboard activates the control relay to power the lights.
Primary relay activation can also be done automatically, an example of which may be the fuel pump for cars and trucks. Under this option, the computer of the car or truck sends an electrical signal to activate the relay of the fuel pump.
Most relays in cars and trucks are located near the fuse (fuse box). If necessary, a special relay for your truck or car use online catalog findspares.co.za to make sure that you will find it quickly and easily, with an option to buy at the best price in the country.