Compare Porsche alternator repair quotes from specialist garages

Porsche is known for its high-performance luxury sports vehicles - the best-selling model being the Cayenne. The company's founder, Ferdinand Porsche, created the world's first hybrid vehicle in 1899. It was called the Lohner-Porsche and was driven by electricity with a fuel-powered generator to charge the batteries, though it never made it into production.

Porsche continues to break new ground to this day; in 2017, the Cayenne S Diesel model earned the Guinness World Record for towing the heaviest vehicle, pulling an enormous Airbus A380 aeroplane weighing 285 tonnes.

The alternator plays a simple but crucial role in keeping your car's battery charged, which means it is also indirectly responsible for starting the vehicle and keeping various components running. It is like a small generator; the engine spins, and the alternator turns this movement into electricity.

Here are five signs your alternator is faulty.

Common reasons for car alternator repair include a failing voltage regulator (which ensures the battery receives the charge at the correct voltage) and worn brushes (which maintain electrical contact with the alternator). An alternator specialist can advise you on the cause of the problem and how best to fix it.

Rather than repairing the component, a total car alternator replacement may be required, which is a straightforward job that most mechanics can do. However, when considering an alternator repair vs replacement, the latter only occurs when multiple parts fail, and the repair cost would be close to that of fitting a new component.

Find out how much it costs to replace an alternator in this guide.