This little guy controls the amount of voltage the alternator puts out. Inside the alternator, you've got what's called the rotor, and the field regulator sends varying amounts of electricity to that rotor. By changing that current, it basically tells the alternator how much voltage to generate. It’s constantly monitoring the system voltage and adjusting itself to keep everything steady, usually around 13.5 to 14.5 volts. It's a pretty precise little piece. It’s a key part of your charging system. The battery gets the car started, but after that, the alternator and this field regulator are responsible for keeping everything powered – lights, radio, computer, everything. It also keeps the battery topped up while you drive. Think of it like this: the alternator is the power plant, and the field regulator is the control room, making sure everything gets the right amount of electricity. A failing field regulator can cause all sorts of problems. You might notice dimming headlights, a battery that won’t charge properly, or even the battery draining while the car is off. Sometimes it'll cause a charging system warning light to come on. If it fails completely, you'll quickly drain the battery and the car will stall. It’s not something you want to ignore. You can find replacements pretty easily; a site like Fixparts Online carries a good selection. Ignoring a bad field regulator will almost certainly lead to bigger, more expensive problems down the road, like a ruined battery or needing to replace the alternator itself. Shop smarter: Field Regulator (MPN F00M144193) is covered for 12 months!

About Bosch

Bosch is a global leader in automotive technology from Germany, celebrated for its innovative products and high-quality components. Based in Germany, Bosch drives advancements in vehicle safety and efficiency worldwide.

Why Choose Bosch?

• Bosch parts are known for lasting a long time, so you won’t have to replace them often. • They perform reliably, helping to keep your vehicle running smoothly and safely. • Bosch invests a lot in research and development, meaning you’re getting the latest technology. • Mechanics trust Bosch, and that’s a good sign of quality and performance you can depend on. Bosch – trusted quality, available at FixParts Online!