Key to diagram: A30 Terminal F2 1 A fuse F3 60 A fuse F4 25 A fuse F1.1 5 A fuse F1.2 25 A fuse MP Earth point TR Basic tractor equipment (tractor retrofit kit according to ISO standard) T12 Main switch XT1 Terminal connector XT2-1 Tractor connector, 9-pin (acc. to ISO standard) XT2-2 Implement connector, 9-pin (acc. to ISO standard) +30/P Potential, power plus +30/E Potential, electronics plus -31 Potential, power earth -32 Potential, electronics earth Electric System Liner 3000 with Communicator TIC 1a-2 Lin-01-el. 12/03 01a - Main power supply - Circuit diagram with „Basic tractor equipment“ retrofit kit (ISO socket)