Dimensions: 3 1/4'' W x 4 1/2'' D x 3 1/2'' H| | Batteries: 2| | Alternators: 1| | Terminals: 4 -- 1/4-18| | Max Output: 75 Amp| | Will Work with Delco "CS" series alternators| | Ground: Negative| | Insures battery isolation without needing to check a switch