Solenoid 150 Amp Continuous Duty Battery Isolation Switch 300 Amp Surge 12 Volt 4-Terminal Silver Alloy Contacts Flat Bracket Insulated Base New Aftermarket Part (Not Rebuilt/Refurbished/Repurposed) Mounting holes: 5/16 x 19/32, 2-13/64 on centers Replaces 3-terminal solenoid, connect wire from one small terminal to mounting bracket. Please verify this is the right part number before ordering