Alternator. Porsche 911 / 930 12V 90Amp NEW  ❭  91160312005

12 Volt 90 Amp Alternator 

The Porsche Alternator is a high-quality 12 Volt 90 Amp charging system component designed for Porsche 911 and Porsche 911 turbo models. As one of the most important electrical components on the vehicle, the alternator generates electrical power while the engine is running and continuously recharges the battery to maintain reliable operation of the vehicle's electrical systems.

Fits:

• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1978-1989 3.3L Turbo (930)

From powering the ignition system and fuel delivery components to supporting lighting, instrumentation, heating and other electrical accessories, the alternator plays a crucial role in the day-to-day reliability and performance of your Porsche. Without a properly functioning alternator, the battery will gradually discharge, leading to starting difficulties, electrical faults and eventually complete vehicle shutdown.

Overall length: 173mm
Voltage: 12V
Power: 90Amp
Direction of rotation: clockwise (CW)
Fixing: 6 studs
Controller: internal
Pulley: not supplied

Whether you're maintaining an air-cooled Porsche 911, servicing a Porsche 911 turbo or carrying out a restoration project, replacing a worn alternator helps ensure dependable performance and protects the vehicle's electrical system.

What Does an Alternator Do?

The alternator converts mechanical energy generated by the engine into electrical energy. Driven by the engine belt system, it supplies power to the vehicle while simultaneously charging the battery.

The alternator is responsible for:

Recharging the battery while driving Powering electrical systems and accessories Maintaining stable system voltage Supporting ignition and fuel system operation Ensuring reliable starting performance

A healthy alternator is essential for keeping every electrical system operating correctly.

Symptoms of Alternator Wear or Failure

Alternators operate continuously whenever the engine is running and are subjected to heat, vibration and electrical load. Over time, internal components such as bearings, brushes, voltage regulators and diodes can wear or fail.

Common symptoms of alternator failure include:

Battery warning light illuminated Repeated flat batteries Slow or difficult engine starting Flickering headlights Dimming dashboard lights Electrical accessories operating intermittently Low charging voltage Unusual whining or grinding noises Burning electrical smell Vehicle stalling due to insufficient voltage

In many cases, alternator failure develops gradually before progressing to complete charging system failure.

Why Alternator Replacement Matters

A faulty alternator can leave the battery unable to recharge properly, eventually causing loss of electrical power and unexpected breakdowns.

Replacing a worn alternator helps:

Restore correct battery charging Improve electrical system reliability Prevent roadside breakdowns Maintain stable voltage output Extend battery life Protect sensitive electrical components Eliminate charging system warning lights Improve overall vehicle dependability

For classic and performance Porsche models, maintaining a healthy charging system is essential for reliable operation and long-term ownership enjoyment.

Features & Benefits

• 12 Volt, 90 Amp output
• Provides reliable battery charging
• Maintains stable electrical system voltage
• Supports ignition and fuel system operation
• Durable construction for long service life
• Ideal for maintenance, repairs and restoration projects       

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91160312005

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