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Cole Hersee # 48120-140 Amp Battery Isolator that is used to convert from a 1-battery system to a 2-battery system. Used in many High Amp Stereo systems, EMS vehicles and Fire Trucks. This isolator will work on most vehicles except General Motors years 1988 – 2007. For General Motors vehicles 1988-2007, you will need #48122 or #48162 which are in a separate listing. A battery isolator allows you to charge 2 batteries from a single alternator, keeping the starting battery isolated from the 2nd battery. Easy to install – instructions are included. Input Volts: 12VDC Output Volts: 12VDC Volts Output Amps Peak: 140 Amps Number of Input Terminals: 1 Number of Output Terminals: 2 Includes Installation Kit?: No Mounting Length: 152.4mm / 6.000in Mounting Width: 122.2mm / 4.811in Mounting Height: 84.9mm / 3.343in Notes: (1) 5/16-18 Input & (2) 5/16-18 Output Studs