Total isolation of all lighting and electrical accessories from vehicleShort circuit protection of all outputs without any relays or other mechanical devices30 A max total capacityGround to isolated outputsIsolated outputs: left turn, right turn, brake, run/accessoryIsolated integrated output: turn/brake outputPlug-and-PlayOptional 4-pin trailer harness part # 2120-0929 (sold separately) can be wired to the DLI outputs providing completely isolated, Plug-and-Play trailer lighting hookup.