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This is Classic Retrofit's upgraded high-output alternator for classic Porsche 911s.

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 with many important technical upgrades over standard. It is not rewound or reconditioned 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 1965 to 1989. 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. 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 alternator is supplied with a 10mm adapter to suit the mid-year and SC cars 1974 - 1983. All of our alternators come complete with heavy duty cables with hydraulic crimped terminals.  These MUST be fitted and not altered in any way.

*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