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- 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