Bosch Voltage Regulator for Porsche 996/986 Boxster/987 Cayman (1997-2006)

This Bosch voltage regulator is a direct-fit replacement for Porsche 996, 986 Boxster, and early 987 Cayman applications listed in the fitment table below. The regulator controls alternator output and charging voltage, so it is a common repair item when the charging system becomes erratic or voltage falls out of spec. Bosch has been a global leader in automotive technology since 1886, pioneering innovations like electronic fuel injection and oxygen (lambda) sensors that shaped modern engine management. Today, Bosch supplies OEM-quality sensors, engine electronics, ignition components, and braking parts found in vehicles worldwide. Known for precision engineering and reliable performance, Bosch parts are built to factory specifications for dependable fitment and long-term durability.

Technical Details

• Manufacturer part number: 1-986-AE0-124
• Part type: Alternator voltage regulator
• Bosch cross reference commonly cataloged under 1986AE0124
• Associated OE reference commonly cataloged under 000 043 206 37
• Rated voltage commonly listed at 14 V to 14.5 V
• Service note: Often replaced during alternator repair or charging-system diagnosis

Fitment & Compatibility

Use the fitment table below to confirm exact year and model before ordering. Voltage regulators can vary by alternator build, so matching the Bosch number is the safe approach.

If you are tracking down undercharging, overcharging, or an intermittent battery light, confirm the regulator number before you pull the trigger. We have been helping with Porsche charging-system parts for over 20 years, and that extra check helps keep the repair straightforward.