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Your Vehicle // Porsche // 996 (911) (1997-2005) // 996 C4 3.4L 1997-08/01
Standard Alternator / Genarator
OE Match alternator and belt for cars with air-conditioning Porsche 986 Boxster and 996 models with Manual or Tiptronic transmission
Fits
- Boxster 986 2.5L 1997–99
- Boxster 986 2.7L 1999–02
- Boxster S 986 3.2L 1999–02
- 996 C2 3.4L 1997–08/01
- 996 C4 3.4L 1997–08/01
- 996 C2 3.6L 09/01–2005
- 996 C4 3.6L 09/01–2005
- 996 C4S 3.6L 09/01–2005
What This Product Does
The alternator converts engine-driven rotation into electricity for battery charging and the vehicle's electrical equipment. Its drive belt transfers the mechanical input needed for generation; belt condition and alignment therefore matter when investigating charging problems.
Functions
- Replenishes battery charge during engine operation.
- Supplies electricity to vehicle systems.
- Transfers engine rotation through the belt drive.
Symptoms of Fault
- Charging warning lamp or insufficient charging voltage.
- Repeated battery discharge and difficult starting.
- Lights that dim or flicker.
- Intermittent electrical operation.
- Whining bearings or a squealing belt.
These signs can have other causes, so confirm the fault before replacing components.
Why Replacement Matters
Renewing a confirmed faulty alternator addresses inadequate or inconsistent charging. Inspecting the belt, pulley alignment, battery and cable connections at the same time helps identify related faults rather than leaving their cause unresolved.
FAQs
Does a flat battery prove the alternator has failed?
No. Battery condition, wiring and earth connections also need checking.
What should be tested before replacement?
Check charging behaviour under electrical load, together with belt condition and the main power and earth connections.
Are all Manual and Tiptronic applications identical?
No. Use the transmission-specific dates above and verify the recorded engine cutoffs where applicable.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99660301205
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
Alternator and belt by OE Match, intended for Porsche 986 Boxster / 996 Manual and Tiptronic applications without AIRCON.
Fits
- Porsche Boxster 986 2.5L 1997–99
- Porsche Boxster 986 2.7L 1999–02
- Porsche Boxster S 986 3.2L 1999–02
- Porsche Boxster 986 2.7L 2003–04
- Porsche Boxster S 986 3.2L 2003–04
- Porsche 996 C2 3.4L 1997–08/01
- Porsche 996 C4 3.4L 1997–08/01
- Porsche 996 C2 3.6L 09/01–2005
- Porsche 996 C4 3.6L 09/01–2005
- Porsche 996 C4S 3.6L 09/01–2005
- Porsche 996 GT3 MKI 1999–02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003–04
For vehicles without air conditioning only. The GT3 diagram identifies the generator separately; it does not establish belt compatibility. Check fitment for your specific vehicle (model, year, engine) before ordering.
What This Product Does
Driven mechanically by the engine, the alternator produces electrical energy to recharge the battery and supply onboard equipment. The belt provides the rotational drive, making its condition and routing relevant to charging-system diagnosis.
Functions
- Generates electricity with the engine running.
- Recharges the vehicle battery.
- Drives the alternator through the belt.
Symptoms of Fault
- Battery warning indicator or low charging output.
- A frequently discharged battery or slow cranking.
- Flickering or unusually dim lighting.
- Intermittent operation of electrical equipment.
- Bearing whine or belt squeal.
Similar symptoms can originate elsewhere in the charging system; testing is needed to establish the cause.
Why Replacement Matters
Replacing an alternator with a verified fault can restore the charging supply. Examine the battery, belt drive, pulley alignment and electrical connections during diagnosis so that associated defects are addressed alongside the failed component.
FAQs
Does battery discharge necessarily indicate alternator failure?
No. Assess battery health, charging cables and earth connections before deciding which component needs renewal.
Which checks are useful before fitting?
Test charging output with electrical consumers switched on, then inspect belt condition and the main supply connections.
Can Manual and Tiptronic fitment be assumed to match?
No. Verify transmission specification, production details and the recorded generator cutoffs; the model list alone does not resolve every application.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99660301205
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04

Reconditioned Alternator Manual cars only
Please note:
Reconditioned Alternators are sold on an exchange basis, A surcharge of £100.00 will be held and then refunded when the old one is returned.
Fits:
Porsche 986 Boxster 2000-2002 Manual
Porsche 996 2000>> Manual
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99660301206
The product you are viewing cross references to these numbers
PLEASE NOTE:
- Used parts need to be sent to us within 30 days from the date of the invoice. Returned items outside this window may be sent back to you as we work on strict return windows with our suppliers.
- 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.
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005

Porsche 986 Boxster 1997-1999 Manual
Porsche 986 Boxster 1997-2002 Tiptronic
Porsche 996 1998-1999 Manual
Porsche 996 1998-2005 Tiptronic
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99660301205
The product you are viewing cross references to these numbers
PLEASE NOTE:
- Used parts need to be sent to us within 30 days from the date of the invoice. Returned items outside this window may be sent back to you as we work on strict return windows with our suppliers.
- 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.
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
Fits:
Porsche 986 Boxster 2000-2002 Manual
Porsche 996 2000>> Manual
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99660301206
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
Fits:
Porsche 986 Boxster 2000-2002 Manual
Porsche 996 2000>> Manual
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99660301206
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
Fits:
Porsche 986 Boxster 1997-1999 Manual
Porsche 986 Boxster 1997-2002 Tiptronic
Porsche 996 1998-1999 Manual
Porsche 996 1998-2005 Tiptronic
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99660301205
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
Porsche 986 Boxster 1997-2002 Tiptronic
Porsche 996 1998-1999 Manual
Porsche 996 1998-2005 Tiptronic
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99660301205
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
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.