Bosch 113-903-803 E Voltage Regulator for Air-Cooled VW

The Bosch 113-903-803 E is an external voltage regulator designed for classic air-cooled Volkswagen charging systems. This regulator controls the output voltage from the generator or alternator to maintain proper charging levels and protect the electrical system from overcharging.

Key Features:

• Direct replacement for original Bosch voltage regulators on air-cooled VW models
• External mounting design for easy installation and service access
• Regulates charging system voltage to prevent battery overcharging
• OEM-quality construction from Bosch, the original equipment manufacturer
• Compatible with 12-volt charging systems

This voltage regulator is a critical component in maintaining proper electrical system operation. It mounts externally on the vehicle body and connects to the generator or alternator to regulate field current. Proper voltage regulation protects the battery and electrical components from damage due to overcharging while ensuring adequate charging during vehicle operation.