1.Low Battery Voltage
A 12v rated battery should operate at the nominal voltage of 12v and a full charge voltage of 12.72v.

2.Misaligned Starter Generator Rotation
For an engine that requires the starter generator to turn clockwise, the starter generator has to be aligned in such a way that it does turn clockwise.

3.Mechanical Damages
Mechanical damage to any other part like the armature, pulley, or brushes can cause the generator to lock up. On locking up, the starter generator will fail to turn the motor over.

For instance, if the brushes get worn out, they might get stuck between the starter generator and lock it up and stop it from moving in any direction.

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