do not press the back button…
Enter your VAT number here and click Verify:
Your details have been verified. VAT number registered to:
,
.
Your order will now be zero rated for VAT purposes. We reserve the right to verify these details after your order request has been made and reinstate VAT if required.
Your VAT details were not recognised or were invalid. Your VAT number must be matched to your Billing Country as specified above. This is currently specified as . You do not need to enter the country code part of your VAT number as this has already been selected in your billing address details above.
The VAT number checking service is currently offline. Please supply your VAT details within the comments or special instructions field below and we will apply a VAT discount after placing your order request.
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
Classic Retrofit 175A High Output Alternator
Future-proof your classic Porsche with the Classic
Retrofit 175A High Output Alternator, the ultimate charging system upgrade
for the Porsche 911 1974-1983. Designed and manufactured in the UK, this
completely new alternator delivers vastly improved charging performance,
reliability and efficiency, making it the highest output alternator currently
available for the classic air-cooled Porsche 911.
Fits:
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
Unlike reconditioned or rewound factory alternators, this is a completely new unit based on the highly efficient Denso six-phase hairpin alternator. Featuring a purpose-designed housing engineered specifically for Porsche fan assemblies, it fits directly into 1965-1989 Porsche 911 fan housings, while the supplied 10mm adaptor makes installation straightforward on 1974-1983 mid-year and SC models.
Capable of producing an impressive 175 Amps maximum output, with over 150 Amps tested using the standard Porsche pulley and V-belt, and an outstanding idle output exceeding 75 Amps, this alternator easily supports modern electrical upgrades while maintaining stable charging voltage.
Whether you've fitted electric air conditioning, upgraded lighting, high-powered audio equipment or additional electrical accessories, this alternator delivers the electrical capacity your classic Porsche deserves.
What Does a High Output Alternator Do?
The alternator generates electrical power while the engine is running, supplying the vehicle's electrical systems and keeping the battery fully charged.
The Classic Retrofit High Output Alternator provides:
- Significantly increased charging capacity.
- Stable battery voltage at idle.
- Faster battery recovery.
- Improved headlamp brightness.
- More efficient starter motor operation.
- Reliable power for modern electrical accessories.
- Reduced voltage drop under heavy electrical loads.
The increased output transforms the usability of classic Porsche models fitted with modern electrical upgrades.
Why Upgrade to the Classic Retrofit Alternator?
The original Porsche alternator was designed for vehicles with relatively modest electrical demands. Today's classic 911s often feature considerably more equipment than Porsche originally intended.
Upgrading offers numerous advantages including:
- Massive 175 Amp maximum output.
- Over 75A output at idle.
- Over 150A tested on the standard pulley and belt.
- Modern Denso six-phase hairpin technology.
- Greater electrical efficiency.
- Lower operating temperatures.
- Higher charging voltage.
- Improved battery health.
- Better starting performance.
- Brighter headlights.
- Reliable operation with electric air conditioning.
- Supports powerful audio systems and auxiliary lighting.
- Direct replacement installation.
- No exchange unit or surcharge required.
When paired with the Classic Retrofit Electric Air Conditioning system, this alternator provides the additional charging capacity required to maintain excellent cooling performance without sacrificing battery voltage.
Superior Engineering
Unlike rebuilt factory alternators, this unit has been engineered from the ground up.
Features include:
- Brand new alternator assembly.
- Denso six-phase hairpin stator technology.
- Custom-designed Porsche-specific housing.
- Superior efficiency compared to OE alternators.
- Reduced heat generation.
- Heavy-duty hydraulic-crimped charging cables included.
- 10mm adaptor supplied for 1974-1983 models.
- Direct installation into Porsche fan housing.
- No rewound components.
- No refurbished internals.
- No
exchange core required.
Important Installation Information
Every alternator is supplied complete with heavy-duty charging cables featuring professionally hydraulic-crimped terminals.
These cables must be installed exactly as supplied and must not be shortened, modified or altered to ensure safe operation and maximum charging performance.
The alternator has an actual output capability of 175 Amps. For continuous operation above 150 Amps, Classic Retrofit recommends upgrading to a serpentine belt drive system.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
911603175AMP
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
Fits:
Porsche 964 1989-94
Porsche 993 1994-98
300 Series WOSP Alternators
The WOSP 300 Series represents our latest-generation alternator technology,
designed for maximum efficiency and performance. These advanced units use
square wire ‘hairpin’ (segment conductor) stators, delivering exceptional
current density and allowing much higher output compared to traditional
designs.
Each alternator case is precision-machined in-house from billet aluminium,
ensuring strength, durability, and a perfect fit. The result is a range of
plug-and-play alternators built to outperform standard OEM units while
maintaining easy installation.
Key Features
- Advanced hairpin stator technology for superior efficiency
- Precision billet housings manufactured in the UK
- Wide range of direct-fit, plug-and-play applications
• Weight: 6.9kg
• Amp: 180
• Connections: B+ / Lamp
• Construction: Full Billet
• All units are produced to BSI ISO 9002 standards.
• All units have their own serial number for traceability.
Fits engines: M64.01 / M64.02 / M64.03 / M64.05 / M64.06 / M64.07 / M64.08 / M64.20 / M64.21 / M64.05S / M64.06S
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96460315601
The product you are viewing cross references to these numbers
.png?width=197 "Alternator High output 240 amp. Porsche 964 / 993 - 96460315601, 964603156AX, 964603156BX, 91160315501, 96460315600 - LMA339")
.png){kind=link}
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
Fits:
Porsche 964 1989-94
Porsche 993 1994-98
300 Series WOSP Alternators
The WOSP 300 Series represents our latest-generation alternator technology,
designed for maximum efficiency and performance. These advanced units use
square wire ‘hairpin’ (segment conductor) stators, delivering exceptional
current density and allowing much higher output compared to traditional
designs.
Each alternator case is precision-machined in-house from billet aluminium,
ensuring strength, durability, and a perfect fit. The result is a range of
plug-and-play alternators built to outperform standard OEM units while
maintaining easy installation.
Key Features
- Advanced hairpin stator technology for superior efficiency
- Precision billet housings manufactured in the UK
- Wide range of direct-fit, plug-and-play applications
• Weight: 6.9kg
• Amp: 240
• Connections: B+ / Lamp
• Construction: Full Billet
• All units are produced to BSI ISO 9002 standards.
• All units have their own serial number for traceability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96460315601
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
Classic Retrofit's upgraded 175A alternator for classic Porsche 964 and 993 models. This alternator is the best upgrade for cars with the standard double pulley or RS single pulley arrangements. The idle output is around 75A depending on pulley size and idle speed.
Fits:
Porsche 964 1989 - 1994
Porsche 993 1994 - 1998
This is a brand new unit, not rewound or reconditioned and there is no core charge or exchange. Based on the large-case Denso 6 phase 'hairpin' alternator, the casing has been custom designed to fit all 964 and 993 fan housings. The alternator offers superior efficiency and produces less heat than the original units.
With so many electrical upgrades pushing old-school charging technology to the limit, Classic Retrofit's upgraded alternator for classic Porsche 911s is the perfect addition to a modern-day classic.
Used in conjunction with our electric A/C, this alternator offers higher levels of cooling without compromising battery voltage. All of our alternators come complete with heavy duty cables.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
964603175AMP
The product you are viewing cross references to these numbers