17. BATTERY/CHARGING SYSTEM DOWNTOWN125i REGULATOR/RECTIFIER WIRE HARNESS INSPECTION Remove the luggage box (refer to the "FRAME COVERS REMOVAL/INSTALLATION" section in the chapter 2). Disconnect the regulator/rectifier connectors (1). Check the connector for loose contacts of corroded terminals. Regulator/Rectifier Measure the voltage between the Red/White wire terminal and ground. There should be same with battery voltage at all times. Regulator/Rectifier 17-7