Alternator. Porsche 911 1975-81 External Regulator  ❭  91160312002

Alternator 12V 75A – Internal Regulator

Restore dependable charging performance with this OEM Supplier 12V 75A Alternator, equipped with an internal voltage regulator. Manufactured by an Original Equipment supplier, this alternator is produced to the same demanding standards as the component originally fitted by Porsche, providing the quality, reliability and fitment expected from factory-specification electrical components.

Fits:

• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1975-1977 3.0L Turbo (930)
• Porsche 911 1978-1983 3.3L Turbo (930) 

The alternator is one of the most important components of the vehicle's electrical system. While the engine is running, it generates electricity to power essential systems including the ignition, lighting, fuel injection, instruments, heating and ventilation controls, whilst simultaneously recharging the battery. A failing alternator can quickly lead to a discharged battery, poor engine performance and complete electrical failure.

This unit is manufactured for precise fitment and dependable long-term operation, making it an ideal replacement for worn or failed original alternators during routine maintenance or restoration.

What Does the Alternator Do?

The alternator converts mechanical energy from the engine into electrical energy.

Its primary functions include:

• Charging the vehicle battery.
• Supplying electrical power whilst the engine is running.
• Maintaining a stable charging voltage.
• Supporting ignition and fuel systems.
• Powering lighting and electrical accessories.
• Preventing battery discharge during normal driving.

The internal voltage regulator continuously controls the alternator output, ensuring the battery and electrical components receive the correct charging voltage without overcharging.

Why Replace the Alternator?

Alternators are subjected to constant heat, vibration and high rotational speeds throughout their service life.

Common causes of failure include:

• Worn bearings.
• Failed internal voltage regulator.
• Worn brushes.
• Damaged slip rings.
• Internal winding faults.
• Diode pack failure.
• Corrosion.
• Age-related wear.

Replacing a worn alternator restores reliable charging performance and helps prevent unexpected breakdowns.

Symptoms of a Failing Alternator

Common signs include:

• Battery warning light illuminated.
• Battery repeatedly going flat.
• Slow engine cranking.
• Dim or flickering headlights.
• Unstable voltage.
• Electrical accessories operating poorly.
• Intermittent charging.
• Bearing noise from the alternator.
• Burning electrical smell in severe cases.

Ignoring these symptoms can eventually leave the vehicle unable to start once the battery becomes fully discharged.

Important Installation Information

This alternator is suitable for Porsche 911 models (1978-1983) using an internal voltage regulator.

For Porsche 911 turbo 3.0ltr (1975-1977) applications, the following additional components are required:

• Resistor 91164198100 × 1
  
• Air Deflector 91110603305 × 1
  
• Cable Connector 111971511 × 2       

Alternator 12V 75A – Internal Regulator

Keep your Porsche's charging system operating reliably with this OE Match 12V 75A Alternator, equipped with an internal voltage regulator. Manufactured to OE specifications, this replacement alternator provides dependable charging performance, helping maintain battery health and ensuring all electrical systems receive a stable power supply.

Fits:
Porsche 911 1978-1983 3.0L / SC
Porsche 911 1975-1977 3.0L Turbo (930)
Porsche 911 1978-1983 3.3L Turbo (930)

The alternator is one of the most important components of the vehicle's electrical system. While the engine is running, it generates electricity to power essential systems including the ignition, lighting, fuel injection, instruments, heating and ventilation controls, whilst simultaneously recharging the battery. A failing alternator can quickly lead to a discharged battery, poor engine performance and complete electrical failure.

This OE Match unit is manufactured for precise fitment and dependable long-term operation, making it an ideal replacement for worn or failed original alternators during routine maintenance or restoration.

What Does the Alternator Do?

The alternator converts mechanical energy from the engine into electrical energy.

Its primary functions include:

• Charging the vehicle battery.
• Supplying electrical power whilst the engine is running.
• Maintaining a stable charging voltage.
• Supporting ignition and fuel systems.
• Powering lighting and electrical accessories.
• Preventing battery discharge during normal driving.

The internal voltage regulator continuously controls the alternator output, ensuring the battery and electrical components receive the correct charging voltage without overcharging.

Why Replace the Alternator?

Alternators are subjected to constant heat, vibration and high rotational speeds throughout their service life.

Common causes of failure include:

• Worn bearings.
• Failed internal voltage regulator.
• Worn brushes.
• Damaged slip rings.
• Internal winding faults.
• Diode pack failure.
• Corrosion.
• Age-related wear.

Replacing a worn alternator restores reliable charging performance and helps prevent unexpected breakdowns.

Symptoms of a Failing Alternator

Common signs include:

• Battery warning light illuminated.
• Battery repeatedly going flat.
• Slow engine cranking.
• Dim or flickering headlights.
• Unstable voltage.
• Electrical accessories operating poorly.
• Intermittent charging.
• Bearing noise from the alternator.
• Burning electrical smell in severe cases.

Ignoring these symptoms can eventually leave the vehicle unable to start once the battery becomes fully discharged.

Important Installation Information

This alternator is suitable for Porsche 911 models (1978-1983) using an internal voltage regulator.

For Porsche 911 turbo 3.0ltr (1975-1977) applications, the following additional components are required:

• Resistor 91164198100 × 1
  
• Air Deflector 91110603305 × 1
  
• Cable Connector 111971511 × 2       

Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
Porsche 911 1978-1983 3.0L / SC
Porsche 911 1975-1977 3.0L Turbo (930)
Porsche 911 1978-1983 3.3L Turbo (930)

 WOSP 200 Series 90 amp Alternator

The WOSP 200 Series Alternators are designed as direct replacements for OEM alternators, making them ideal for classic Porsche restorations, standard road use, or motorsport applications where a smaller, lower-output alternator is preferred.

Unlike the modern 300 Series units, the 200 Series uses traditional round-wire stator technology. This makes them faithful to original designs while still benefitting from WOSP’s reputation for high-quality engineering and reliability.

Key Features of the 200 Series 

• Round-Wire Stator Design – based on traditional alternator construction, offering reliable charging performance.
  
• Direct OEM Replacement – plug-and-play compatibility with factory alternators.
  
• Lower Output Race Alternators – compact, lightweight designs available for motorsport or specialist builds.
  
• Durable Construction – built to WOSP’s exacting standards to withstand heat, vibration, and long-term use.
• Easy Fitment – engineered for straightforward installation without modification.

Why Choose a 200 Series Alternator?

• OEM Accuracy – ideal for those seeking authenticity in restorations.
  
• Cost-Effective Reliability – a direct replacement for worn or failing factory units.
  
• Motorsport Ready – smaller/lower output versions reduce parasitic loss, improving efficiency in lightweight race applications.
  
• Proven Technology – traditional design trusted for decades, refined by WOSP for modern standards.

Common Signs Your Alternator Needs Replacing

• Battery Warning Light on dashboard
  
• Dim or Flickering Lights at idle or under load
  
• Flat Battery or difficulty starting
  
• Electrical Failures when multiple systems are in use
  

If you experience these symptoms, replacing your alternator with a WOSP 200 Series LMA033 ensures dependable charging and reliable performance.

 Why Buy from Design911?

• Authorised WOSP Supplier – genuine alternators, guaranteed fitment
  
• OEM & Motorsport Options – covering both factory replacements and race-spec alternators
  
• Expert Support – guidance on choosing the right output for your Porsche
  
• Worldwide Shipping – secure, fast delivery from our Essex-based warehouse

Upgrade or restore your Porsche with the WOSP 200 Series LMA033 Alternator – the perfect balance of OEM accuracy, proven reliability, and WOSP engineering excellence.