Sierra 18-6852 Battery Isolator 165 Amp - 1 Alt, 2 Batteries Dimensions 8 W x 4 12 D x 3 12 H Batteries 2 Alternators 1 Terminals 3 -- 38-16 Max Output 165 Amp Negative Ground Insures battery isolation without needing to check a switch Will not work with Delco CS style alternators California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Google Product Type Chargers Product MPN 18-6852 Product UPC 808282311568