What are the causes of weak starter rotation?

[StNadia]

The causes of weak starter rotation are: 1. Insufficient battery power or loose, poor contact of connecting wires; 2. Starter bearings being too tight or excessively loose; 3. Burned contacts in the starter switch or short-circuited electromagnetic switch coils; 4. Open or short circuits in the series auxiliary coils of a moving-armature starter. Symptoms of weak starter rotation include: 1. The starter rotates slowly and weakly, making it difficult to drive the engine; 2. When the starter switch is engaged, the starter only makes a clicking sound without starting. The starter, also known as the motor, converts the electrical energy from the battery into mechanical energy to drive the engine flywheel and initiate engine startup.