Motorcycle Electrical Starter Solenoid Relay Switches For DC12V ST17 S2000 A2500 A3000 U4500 U4500w SE25 SE35 SE45 A2000 A2500 This solenoid relay switch is designed for use with 12-volt DC electrical systems commonly found on motorcycles.It functions as a key component in the starter , engaging the starter motor when the ignition is activated.The unit is compatible with models designated ST17, S2000, A2500, A3000, U4500, U4500w, SE25, SE35, SE45, and A2000.Constructed to meet standard electrical specifications, it supports connection and disconnection of -current circuits.The compact design allows for straightforward installation in tight engine compartments.This relay switch aids in consistent starting performance under normal operating conditions. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.