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With so many electrical upgrades pushing old-school charging technology to the limit, Classic Retrofit's high-output 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.  The alternator has an internal regulator.

Tested at 150A amps on the standard 911 pulley and belt and with a simple installation process, this UK-manufactured upgrade is the highest output alternator available for your classic Porsche 911. The idle output is in excess of 75A!

This is a brand new unit, not a reconditioned or rewound item and there is no core charge or exchange. Based on the proven Denso 6 phase 'hairpin' alternator, the casing has been custom designed to fit all 911 fan housing from 1964 to 1973.  The alternator offers superior efficiency and produces less heat than the original units. 

Fitting to our 911 demonstrator led to an instant increase of almost 10% in charging voltage. This may not sound like much, but it is huge in voltage terms: even half a volt can transform headlamp brightness, starter efficiency and battery health. For cars running additional electrical items such as bigger stereos and additional lighting, this is a game changer. 

The high output alternator is a direct fit for early cars up to 1973. All of our upgraded alternators come complete with heavy duty cables for positive and negative terminals.

*The actual output rating for this unit is 175A.  For sustained output above 150A we recommend a serpentine belt arrangement.

Downloads

150A Alternator Install Manual.pdf

Product Video