mxu 400 Workshop-manual : Page 104

          Problem: Magneto overcharges
Condition                                            Remedy
 1. Internal battery short circuited                  1. Replace battery
 2. Regulator/rectifier resistor damaged - defective  2. Replace resistor
 3. Regulator/rectifier poorly grounded               3. Clean - tighten ground connection
Problem: Charging unstable
Condition                                            Remedy
 1. Lead wire intermittently shorting                 1. Replace lead wire
 2. Magneto internally shorted                        2. Replace magneto
 3. Regulator/rectifier defective                     3. Replace regulator/rectifier
Problem: Starter button not effective
Condition                                            Remedy
 1. Battery charge low                                1. Charge - replace battery
 2. Switch contacts defective                         2. Replace switch
 3. Starter motor brushes not seating                 3. Replace starter motor
 4. Starter relay defective                           4. Replace relay
 5. Emergency stop - ignition switch off              5. Turn on switches
 6. Wiring connections loose - disconnected           6. Connect - tighten - repair connections
Problem: Battery "sulfation" (Acidic white powdery substance or spots on surfaces of cell plates)
Condition                                            Remedy
 1. Charging rate too low - too high                  1. Replace battery
 2. Battery electrolyte insufficient                  2. Keep electrolyte to prescribed level
 3. Specific gravity too low                          3. Charge battery - add distilled water
 4. Battery run-down - damaged                        4. Replace battery
 5. Electrolyte contaminated                          5. Replace battery
Problem: Battery discharges too rapidly
Condition                                            Remedy
 1. Electrolyte contaminated                          1. Replace battery
 2. Specific gravity too low                          2. Charge battery - add distilled water
 3. Charging system not charging                      3. Check magneto - regulator/rectifier - circuit connections
 4. Cell plates overcharged - damaged                 4. Replace battery - correct charging system
 5. Battery short-circuited                           5. Replace battery
 6. Specific gravity too low                          6. Charge battery
Problem: Battery polarity reversed
Condition                                            Remedy
 1. Battery incorrectly connected                     1. Reverse connections - replace battery - repair damage




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