TM 9-2320-361-20 4-39. SEALED BEAM AND HEADLAMP HOUSING MAINTENANCE (Contd) 1. 2. 3. 4. 5. 6. 7. Using chalk, draw a horizontal line (3) on a wall the height of center of headlamp (6). Park truck facing wall so headlamps (6) are 25 ft (7.62 m) from wall. Using chalk, draw a vertical line (1) through horizontal line (3) so it is in line with center of headlamp (6). Turn headlamps (6) on low beam (TM 9-2320-361-10). Adjust headlamp (6) horizontal direction with adjusting screw (5) until left edge of bright light area (2) on wall is 2-6 in. (5.08-15.24 cm) right of vertical line (1). Adjust headlamp (6) vertical direction with adjusting screw (4) until top edge of bright light area (2) on wall is touching lower side of horizontal line (3). Adjust other headlamp (6) using same procedure. FOLLOW-ON TASK: Connect battery ground cable (para. 4-48). 4-60