mxu 250 300 2 Werkstatthandbuch : Seite 33

          1. GENERAL INFORMATION                                                                  MXU 300/250


 POOR CHARGING (BATTERY OVER DISCHARGING OR OVERCHARGING)
 Undercharging

 Inspection/Adjustment                         Symptom                       Probable Cause

 Start engine and test
 limit voltage of battery
 terminals
                                                    Voltage does not        Dead battery
                                Normal voltage
                                                    increase                Faulty battery

 Measure resistance
 between AC generator
 coil terminals
                                                                            Faulty A.C. generator coil
                                    Normal          Resistance too high     Broken yellow wire
                                                                            Shorted pink and yellow
 Connect battery (+) wire                                                   wires
 to regulator/rectifier
 coupler red wire and
 battery (-) wire to engine
 ground and test voltage
                                Normal voltage           No voltage         Broken red wire

 Check regulator/rectifier
 coupler for loose
 connection
                                                                            Faulty regulator/rectifier
                                   Normal                Abnormal
                                                                            Poorly connected coupler

                                                                            Faulty A.C. generator

 Overcharging

 Inspection/Adjustment                         Symptom                       Probable Cause

 Connect battery (+) wire
 to regulator/rectifier
 coupler green wire and
 battery (-) wire to engine
 ground and test voltage
                              Battery has voltage   Battery has no
                              with ignition         voltage with ignition   Broken green wire
                              switch "ON"           switch "ON"

 Check regulator/rectifier
 coupler for loose
 connection


                                   Normal                Abnormal           Poorly connected coupler

                                                                            Faulty regulator/rectifier



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