Clarify vehicle parameters Voltage matching: The voltage of common car starters is 12V and 24V. Most household cars use 12V starters, while some large trucks, buses, or construction machinery may use 24V starters, which need to be selected according to the electrical system voltage of the vehicle. Power and torque adaptation: Generally speaking, the larger the engine displacement and compression ratio, the greater the required starter power and torque. Small gasoline engines may only require a 1-2kW starter, while large diesel engines may require a starter of over 5kW. Appropriate installation size: The external dimensions, installation hole position, and size of the starter motor must match the layout and installation position of the vehicle's engine compartment to ensure that the starter motor can be installed smoothly without interfering with other components.