Stylemafia Max 200A Trombetta Continuous Solenoid Relay 3 Terminal Heavy Duty Winch Marine 24106 SPST Solenoid 12VDC Contacts:Normally Open (NO)/ Flat Base Metal Case / 10-32 Terminal 3 Pole Battery Isolation Solenoid, 12VDC With 2 Copper Point,Housing plated Steel Case / 180Flat mounting bracket./ Mounting holes: 5/16 x 19/32, 2-13/64 on centers. Our Coil Roll is using 180℃ Copper. Max Current Above 200amp/ Rate Current: 100A / Our Cover is Environmental Plating,Sealed Unit Protects Solenoid From The Elements Helping Prevent Corrosion INSTIALL：One side goes to Battery, opposite side to starter, top screw which is smaller goes to switch or key start only. It is already grounded internal. Note:If it is the energizing circuit which is typically 16/18 Awg , suggest a 5amp fuse;If 10 Awg wire suggest 30 amp auto cicuit breaker; If high output alternator, suggest an 8 Awg wire with a 50 Amp auto circuit breaker