Troubleshooting; Charging System; 12. Electrical System; Ignition System - Sym MB10A7-A series Service Manual

12. Electrical System

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Troubleshooting

Charging system

No battery voltage
Battery discharged
The cable disconnected
The fuse is blown
Improper operation of the main switch
Low battery voltage
The battery is not fully charged
Poor contact
Poor charging system
Poor regulator rectifier
Intermittent power supply
Loose charging system coupler
Poor contact of the battery cable
Poor charging system
Burned fuse
Poor contact, open or short circuit
Poor regulator rectifier
Poor ACG

Starting system

Starter motor does not work
The fuse is blown
The battery is not fully charged
Poor main switch
Poor starter switch
The front and rear brake switches do not
operate correctly
Poor starter relay
The ignition coil is poorly connected, open
or short-circuited
Poor starter motor
12-4
To this chapter contents

Ignition system

No spark
Poor spark plug
The cable is poorly connected, open or
short-circuited
~between AC. Generator / C.D.I.
~between C.D.I. / ignition coil
~between C.D.I. / main switch
Poor main switch
Poor C.D.I.
Poor AC. Generator
Engine does not crank smoothly
Primary winding circuit
~Poor ignition coil
~Poor contact of cable
~Poor contact of main switch
Secondary winding circuit
~Poor ignition coil
~Poor spark plug
~Poor ignition coil cable
~Current leakage from spark plug cap
Incorrect ignition timing
~Poor AC. Generator
~Improper installation of pulse coil
~Poor C.D.I.
Weak starter motor
Poor charging system
Insufficient battery voltage
Poor contact of power cable
The starter motor gear is stuck by foreign
material
Starter motor works but engine does
not crank
Poor starter motor pinion
The starter motor run in reverse direction
Poor starter clutch
Poor battery