What are the reasons for the starter not starting?

[VanPresley]

The reasons for the starter not starting are: 1. Severe battery depletion; 2. Poor contact in the starter circuit or switch; 3. Short circuit, open circuit, or grounding in the starter field winding or armature winding; 4. Poor contact between the brushes and the commutator; 5. Short circuit or open circuit in the electromagnetic switch coil; 6. Fault in the control circuit. Precautions for using the starter: 1. The starter should not be operated for more than 5 seconds each time, and a wait of more than 2 minutes is required before restarting. If a third consecutive start is needed, a 15-minute break should be taken; 2. After the engine starts, the starter control circuit must be immediately cut off to stop the starter; 3. When the brush length is less than 50% or the contact area wear exceeds 70%, replacement should be performed.