TM 10-3930-669-20 (2) Opening cab engine access panel (3), locate wire harness (4). (3) Pull back red covers (5) from main power switch (6). (4) Remove nut (7), lock washer (8), and four wires (9, 10, 11, and 12) from main power switch (6).  Discard lock washer. (5) Remove wires (9, 10, 11, and 12) from harness assembly (13). (6) Remove nut (14), lock washer (15), and wire (16) from main power switch (6).  Discard lock washer. (7) Position wires (9, 10, 11, 12, and 16) clear of components that will be removed with the cab. (8) Remove hoses (17 and 18) from two fittings (19 and 20). 15-7