Please wait… 
Please wait while we process your order,
do not press the back button… 
Design 911 Design 911 supply Porsche parts, Porsche spares and Porsche accessories, to both retail and to the trade. Our Porsche product and accessory range includes brakes, exhausts, tyres, wheels and Porsche panels and interiors. https://www.design911.co.uk/images/schemaLogo.png https://www.design911.co.uk/images/schemaLogo.png +443456003478 https://www.design911.co.uk Facebook Instagram

Standard Alternator / Genarator

Filter by brand
DISPLAYING 1 to 2 (of 2 products)
92860311401/1
Product Information
Product Information

Alternator 14 Volt 90 Amp

The Porsche Alternator is a high-quality 14 Volt, 90 Amp charging system component designed for Porsche 928 models produced between 1978 and 1984. As a critical part of the vehicle's electrical system, the alternator generates electrical power while the engine is running and continuously recharges the battery to ensure reliable operation of all onboard systems.

The alternator supplies power to essential components including the ignition system, fuel injection, engine management systems, lighting, instrumentation, climate control and electrical accessories. Without sufficient charging output, the battery will gradually discharge, leading to electrical faults, poor starting performance and eventual vehicle breakdown.

Fastening Type: Single pivoted lever
Pulleys: without belt pulley
Info: with integrated regulator
Rotation Direction: Clockwise rotation
Connector / Clamp without connection for speed sensor
Voltage: 14v
Alternator Charge Current: 90 amp
manufacturer quality: MADE IN GERMANY

For owners of early Porsche 928 models, maintaining a healthy charging system is essential to preserve reliability, performance and the smooth operation expected from Porsche's luxury V8 grand tourer.

What Does an Alternator Do?

The alternator converts mechanical energy from the running engine into electrical energy. Driven by the engine belt system, it continuously generates power to operate the vehicle's electrical systems while simultaneously charging the battery.

The alternator is responsible for:

Charging the battery while driving Supplying power to vehicle electrical systems Maintaining correct system voltage Supporting ignition and fuel injection operation Ensuring reliable engine starting

A properly functioning alternator is essential for maintaining stable electrical performance throughout the vehicle.

Symptoms of Alternator Wear or Failure

Alternators operate under constant electrical and mechanical load and are exposed to heat, vibration and age-related wear. Over time, internal components such as bearings, brushes, voltage regulators and rectifiers can deteriorate.

Common symptoms of alternator failure include:

Battery warning light illuminated Flat or repeatedly discharged battery Slow engine cranking Hard starting Flickering or dim headlights Weak dashboard illumination Electrical accessories operating intermittently Low charging voltage Whining, grinding or bearing noises Burning electrical smell Engine stalling caused by low system voltage

In many cases, charging performance gradually deteriorates before complete alternator failure occurs.

Why Alternator Replacement Matters

A failing alternator can leave the battery unable to recharge, eventually resulting in complete loss of electrical power and vehicle breakdown.

Replacing a worn alternator helps:

Restore proper battery charging Prevent unexpected breakdowns Improve electrical system reliability Maintain stable charging voltage Extend battery life Protect sensitive electrical components Eliminate charging system warning lights Ensure dependable vehicle operation

For classic Porsche 928 models, maintaining correct charging voltage is especially important for protecting ageing electrical systems and ensuring long-term reliability.

Features & Benefits

  • 14 Volt, 90 Amp output
  • Provides reliable battery charging
  • Maintains stable electrical system voltage
  • Supports ignition and fuel injection systems
  • Helps prevent battery discharge
  • Durable construction for long service life
  • Ideal for maintenance, repairs and restoration projects

Keep your Porsche 928 charging system operating at peak performance with this Alternator 



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

92860311401
92860311401

The product you are viewing cross references to these numbers
92860311303/1
Product Information
Product Information
exchange
Reconditioned Alternator 90amp
Please note:
Reconditioned units are sold on an exchange basis, A surcharge of £175.00 will be held and then refunded when the old one is returned.

Fits:
Porsche Porsche 928 4.5ltr 1978-1982

For vehicles with 12V main current,
Amp: 90 A
Connections: 2 Stud (B+, W) & spade (D+)
Fan And Pulley Type: (E) Fan, single-V fixed pulley
Fixing Points: 2
D+ = Warning Light

Diagram ref no 6

Please note:
Reconditioned Alternators are sold on an exchange basis, A surcharge of £150.00 will be held and then refunded when the old one is returned.


    PLEASE NOTE:
  • The surcharge for this reconditioned part will be refunded when the exchange unit is received and approved by us and the relevant manufacturer.
  • Please note, surcharge refunds often take an average of 6 to 8 weeks to be approved by the manufacturer.
  • Acceptance of the exchange part is at the manufacturer's discretion, based on the part being fit for reconditioning.
  • All surcharges and exchanges are subject to our terms and conditions.




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

92860311303
92860311303
90amp

The product you are viewing cross references to these numbers
DISPLAYING 1 to 2 (of 2 products)
About Standard Alternator / Genarator

Standard Output Alternators – Reliable Power Generation for Porsche Vehicles

Standard output alternators are a vital component in your Porsche’s electrical and charging system. They generate the electricity required to power essential systems such as lighting, ignition, infotainment, and battery charging. A dependable alternator ensures your vehicle maintains optimal voltage output, supporting both performance and everyday drivability.

At Design911, we offer a complete range of genuine and manufacturer-quality standard output alternators for Porsche models including 911, Boxster, Cayman, Cayenne, Macan, Panamera and transaxle models. Each alternator is precision-engineered for efficient charging, quiet operation, and long-term durability, delivering the performance your Porsche deserves.

What Do Standard Output Alternators Do?

Alternators play a crucial role in your Porsche’s electrical system. Their main functions include:

  • Generating electrical power to run engine and vehicle electronics.
  • Charging the battery while the engine is running.
  • Regulating voltage output for consistent electrical performance.
  • Powering accessories such as headlights, fans, and infotainment systems.

Standard output alternators provide reliable current for road use, ensuring steady voltage supply without overloading your vehicle’s electrical components.

Why Do Alternators Fail?

Alternators operate under high mechanical and electrical loads, so over time they can wear or fail due to age, heat, and vibration. Common causes include:

  • Worn bearings or brushes reducing output efficiency.
  • Faulty voltage regulators causing under- or overcharging.
  • Corrosion or oxidation in internal electrical connections.
  • Loose or slipping drive belts affecting alternator speed.
  • Exposure to moisture, oil, or debris damaging internal components.

Symptoms of alternator failure include dimming headlights, electrical malfunctions, dead batteries, or dashboard battery warning lights.

Why Replace a Faulty Alternator?

A failing alternator can cause serious electrical problems, leaving you with a drained battery or stranded vehicle. Replacing a weak or damaged alternator restores proper charging function, ensuring smooth performance and reliability.

Benefits of replacement include:

  • Consistent battery charging and voltage stability.
  • Improved performance of all vehicle electronics.
  • Prevention of battery drain and starting issues.
  • Quiet, efficient, manufacturer-quality alternator operation.

Each alternator in this range is made using high-grade materials and precision-balanced components, ensuring dependable performance, low noise, and strong output for both standard and high-demand driving conditions.

1. What are the signs of a failing alternator in a Porsche?
Common signs of a bad alternator include dimming headlights, battery warning lights on the dashboard, slow or failed engine starts, and unusual whining noises from the engine bay. You might also notice intermittent electrical issues or a drained battery, which often indicates the alternator is no longer charging efficiently.

2. How long should a Porsche alternator last?
A well-maintained alternator in most Porsche models typically lasts between 60,000 and 100,000 miles, depending on driving conditions and electrical demand. Regular maintenance of belts and battery connections helps extend alternator lifespan. If your vehicle is frequently driven in stop-start traffic or harsh environments, periodic inspections are recommended.

3. Can I drive my Porsche with a failing alternator?
Driving with a failing alternator is not recommended. Once the alternator stops generating power, your Porsche will rely solely on the battery — which can drain quickly. This can lead to engine stalling, loss of power steering, or total electrical failure. To prevent further damage, it’s best to replace the alternator as soon as symptoms appear.

4. What causes alternator failure in Porsche vehicles?
Alternator failure can be caused by worn bearings or brushes, corrosion in electrical connections, a damaged voltage regulator, or contaminants like oil or moisture entering the alternator housing. Over time, high temperatures and belt tension can also reduce efficiency or cause internal damage. Regular servicing helps identify these issues early.

You may also like
Popular Models