The following article discussing Alfa Romeo 155 Starting and Charging system. Begin with detail illustration of the wiring diagram, you will find detail description and explanation of the starting and charging system of the vehicle. Alfa Romeo 155 starting and charging circuit are composed of one battery, starter motor, and alternator. The battery (12 V) is of the sealed type and does not required maintenance. The starter motor consist of a motor supplied DC power from the battery and command and engagement solenoid.