A relay is basically an electrically operated switch. It takes a relatively small electrical signal and uses that to control a much larger one. Think of it like a gatekeeper – a little nudge opens a big door. It allows a low – current circuit to control a high – current circuit. They handle things like headlights, the starter motor, the horn – anything that needs a lot of power to run. They’re scattered all over the vehicle, mostly in the under – hood electrical center, but sometimes you’ll find them in the body control module area too. They're part of a circuit, sitting between the power source and the device they’re controlling. They don’t make the power, they just direct it where it needs to go. They’re often used where running a high – current wire directly from a switch to the device would be impractical or unsafe. They protect the wiring and other components. Without a relay, those high – current devices would put a huge strain on your switches and wiring, leading to overheating and potentially a fire. It acts like a shield for the sensitive parts of your system. You’ll notice if a relay goes bad because the associated device – a headlight, the starter, whatever it is – will stop working, or might work intermittently. Sometimes you'll get nothing at all. We carry a pretty good selection of these at Fixparts Online, and matching the right one is key. It’s usually labeled with a part number that makes it easier to find the correct replacement. Satisfaction guaranteed: Relay (MPN 0986AH0151) comes with a 12-month warranty!

About Bosch

Robert Bosch GmbH is a global leader in automotive technology, offering high-quality parts and systems that enhance vehicle efficiency, safety, and reliability.

Why Choose Bosch?

• Bosch parts are known for being reliable and lasting a long time, which can save you money on repairs in the future. • They’re a leading supplier to car manufacturers, so you’re getting the same quality parts used in many new vehicles. • Bosch invests a lot in research and development, meaning their parts often have the latest technology for better performance. • You can find Bosch parts for a wide range of vehicles, from older models to the newest cars and trucks. Bosch delivers excellence, FixParts Online delivers to your door.