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Standard Alternator / Genarator

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ALTERNATORKIT911.3.2
Product Information
Product Information
Alternator with belt & shims 12V 90Amp

Fits:
Porsche 911 3.2L 1984-89
Porsche 930 3.3L 1978-89

Renewed cover with brand new electrics.
2 years warranty.

Overall length: 173mm
Voltage: 12V
Power: 90Amp.
Direction of rotation: Clockwise (CW)
Fixing: 6 studs
Controller: internal
Pulley: no

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Related, superseded, cross reference or alternative numbers for comparison.

ALTERNATORKIT911.3.2
91160312005
91160312005
911603120EX

The product you are viewing cross references to these numbers
ALTERNATORKIT911.3.0
Product Information
Product Information

Alternator with belt and shims for Porsche 911 3.0L 12v 75A applications, supplied as a standard output unit for classic 911 charging systems.

What This Product Does This alternator provides electrical power to run the vehicle’s systems and maintain the battery charge while the engine is running. It is intended as a direct-style replacement to support stable charging and correct fitment on suitable Porsche 911 3.0L models.


Functions

  • Generates electrical power for engine and vehicle electronics
  • Maintains battery charge during engine operation
  • Regulates output to help provide consistent system voltage
  • Supplies current for lighting, heating, and ancillary equipment

Symptoms of Fault

  • Battery warning light illuminated or flickering
  • Dimming or pulsing lights, especially at idle
  • Repeatedly flat or weak battery
  • Electrical functions behaving erratically
  • Whining, grinding, or rumbling noise from the alternator area
  • Belt squeal or visible belt slip under load

Why Replacement Matters A worn or failing alternator can lead to low charging voltage, causing starting issues, flat batteries, and unstable electrical behaviour. Replacing a weak unit with a correctly specified alternator helps restore reliable charging performance and supports proper operation of ignition, lighting, and other electrical systems on classic Porsche 911 models.

Fits

  • Porsche 911 & 912 (1965–1989) → 911 1974–1977 2.7L / 1976–77 3.0 Carrera
  • Porsche 911 & 912 (1965–1989) → 911 1978–1983 3.0L / SC


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Related, superseded, cross reference or alternative numbers for comparison.

ALTERNATORKIT911.3.0
91160312004

The product you are viewing cross references to these numbers
61660310201/3
Product Information
Product Information
12V. 25Amp DC Generator ext.reg.

Fits:
Porsche 356B 1600 1.6L 01.1960 - 08.1963 616.1
Porsche 356B 1600 S 1.6L 01.1960 - 08.1963 616?
Porsche 356B 1600 S-90 1.6L 01.1960 - 08.1963 616.7
Porsche 912 1.6 Coupe 1.6L 09.1967 - 08.1968 616.39
Porsche 912 1.6 Coupe 1.6L 09.1965 - 08.1969 616.36

Overall length: 89 mm outer diameter
Voltage: 12V
Power: 25Amp.
Rotation: left, counter-clockwise CCW
Fixing: caliper-fixing (clamp)
Control: no
Pulley: no
Special feature: with continuous wave

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

61660310201
0101206113
61660310201

The product you are viewing cross references to these numbers
91110603305/1
Product Information
Product Information
Air deflector alternator. 
The air deflector serves as an air baffle and provides optimal cooling of the cylinders. Bolts to the back of the alternator.

Fits:
Porsche 911 - 1975 to 1977
Porsche 911 SC - 1978 to 1983

Diagram ref no 10

Mounted on the rear of the alternator or alternator hub, bolting into or adjacent to the fan housing / ventilation shroud.

What it does:
Guides airflow from the cooling fan over the alternator and engine to maintain proper cooling
 Extends or positions the alternator hub correctly so pulleys are aligned and belt tension is correct
 Helps ensure consistent air circulation in the engine cooling system

Over time, deflectors or hub extensions can become warped, cracked, or corroded, compromising airflow and misaligning pulleys. A damaged deflector may lead to poor alternator cooling, reduced alternator lifespan, or belt misalignment. Replacing restores correct spacing, airflow direction, and ensures reliable alternator performance under all conditions.

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

91110603305
91110603305
91110603304
91110603303

The product you are viewing cross references to these numbers
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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.

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