Cole Hersee 48540 FlexMod Smart Battery Isolator Controller 12V or 24V Flexmod Timer smart battery isolator Controller Preserves starting battery voltage by isolating the auxiliary battery when syatem voltage drops. Turns any electromecanical solenoid or relay into a Battery Isolator. Works with ECM controlled alternators. Terminals - three 5/16" studs Unit is autotanging - senses 12V or 24V systems. Load current: 10A at 12V at 85 degrees C.