• In order to start an engine, it needs to have an electrical current to in order for it to start. The start provides this necessary electrical current and consists of a solenoid which is connected directly to the engine and an electrical motor DC. When the starter motor does not start, there may be a problem with the solenoid.
  
  

Vibrations and Movement

• If the starter motor is not properly mounted, then it can cause the starter to shake excessively. This extra motion can cause the components of the solenoid to become damaged, not completing the necessary connection between the starter motor and the engine.
  
  

Corrosion

• Corrosion can form on components of the solenoid, which can cause the solenoid to not make the proper connection. In other words, not creating the proper circuit between the engine and starter.
  
  

Wiring

• The wiring of the solenoid could cause it not to work properly. If the wiring is defective, then it will not make the proper connection, breaking the circuit.