TM 5-3805-281-24-2
Robert Bosch Starting Motor Repair
DIAGNOSING STARTING MOTOR
MALFUNCTIONS
FAILS TO OPERATE, NO CURRENT DRAW
60
Open field circuit (all field windings)
10
4
Open armature windings
Defective brush contact with commutator
Open solenoid windings
Defective solenoid contacts
FAILS TO OPERATE, HIGH CURRENT DRAW
Grounded field windings or armature windings
Seized bearings
LOW SPEED, LOW CURRENT DRAW
High internal resistance
Defective brush contact with commutator
LOW SPEED, HIGH CURRENT DRAW
Low Speed, High Current Draw
HIGH SPEED, HIGH CURRENT DRAW
Shorted field windings
NOTE: This test will not detect individual open-circuited
field coils--the stator would have a slow cranking
speed but would pass this test.
RG,RG34710,2341
1915MAR971/1