An automobile depends so much on the battery to power its engine and various electrical devices. No wonder, loads of electrical wirings are found under the hood. However, you do not simply wire up these devices directly to the battery. You need a relay to come between the energy source and the electrical component. Take the horn for example. If it is wired directly to the battery, then you'll be blasting off the horn the moment you turn the ignition on. Bet you wouldn't want to drive around with your horn going off non-stop. That would just be plain ridiculous.
To put the relay's function in simple terms, this component keeps an electrical component from frying up due to the continuous supply of high voltage from the battery. Yes, it functions similarly to a switch, but they're different in that you have direct control over a switch, whereas the relay functions practically on its own. Usually located under the hood, it's basically an electromagnetic device that operates in a low-current circuit to open and close another circuit of higher current capacity. In short, the relay's the one responsible for closing and opening the line for the current to pass through every time you use the switch to turn a certain device or mechanism on and off.
This device is available in different kinds of configurations. These include the SPST (single pole single throw), SPDT (single pole double throw), and DPDT (double pole double throw). Whatever configuration a relay has, the switch is either in an NC (normally closed) or NO (normally open) state.
Now the typical problem you'd encounter when this mechanism malfunctions is that when you switch on a component on, it doesn't do anything. An example is having a busted electricity-relaying device in the fuel pump's electrical lines. Because the pump isn't receiving enough power, it won't be able to inject enough fuel into the engine, causing the latter to eventually die down. The same thing goes for other onboard devices such as the power windows, car alarms, headlights, tail lights, and signal lights. There are two common reasons for car relay failure: either the component is already overused or it needs to be cleaned because of dirt or grime build-up. Dirt build-up is easy to deal with, but if a relay's already damaged beyond repair or showing signs of old age such as cracked or worn wires, you'll have to get a new one.
When one of your car relays gets damaged, don't think twice about getting a replacement unit from Parts Train. We guarantee that all our car parts and accessories are made from high-quality materials to ensure their superb performance and durability. So, when looking for a quality but affordable replacement relay, just check out our site anytime.