Suzuki Wagon R Manual page 1332

Condition
Starting motor running
but too slow (small
torque)
Starting motor running,
but not cranking engine
Noise
Starting motor does not
stop running
Possible Cause
If battery and wiring are satisfactory,
inspect starting motor
D Insufficient contact of magnetic switch
main contacts
D Layer short-circuit of armature
D Disconnected, burnt or worn
commutator
D Grounding of field coil
D Worn brushes
D Weakened brush springs
D Burnt or abnormally worn end bush
D Worn pinion tip
D Poor sliding of over-running clutch
D Over-running clutch slipping
D Worn teeth of ring gear
D Abnormally armature shaft clearance
D Worn pinion or worn teeth of ring gear
D Poor sliding of pinion (failure in return
movement)
D Lack of grease in each part
D Fused contact points of magnetic switch
D Short-circuit between turns of magnetic
switch coil (layer short-circuit)
D Failure of returning action in ignition
switch
CRANKING SYSTEM 6G2-3
Correction
Replace magnetic switch.
Replace.
Replace.
Repair.
Replace brush.
Replace spring.
Replace bush.
Replace over-running clutch.
Repair.
Replace over-running clutch.
Replace flywheel (M/T) or drive
plate (A/T).
Replace armature or starter assembly.
Replace over-running clutch or
flywheel (M/T), drive plate (A/T).
Repair or replace.
Lubricate.
Replace magnetic switch.
Replace magnetic switch.
Replace.