TM 9-2320-209-10-1 FRAME 14 Soldier A Soldier B Soldier A Soldier B Soldier A 1. Using thumb, lift up on unlock lever (1) and hold it up. 2. Using forefinger, pull down main switch (2) to DRIVE position. Let go of unlock lever (1). 3. Check semitrailer running lights (3) to see if they are on. 4. Press service foot brake (4) . 5. Check semitrailer stop lights (5) to see if they go on. 6. Turn main switch (2) to STOP position. NOTE If lights do not work right tell organizational maintenance. 4-230