TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks

TM 9-2320-361-24-1 0013 00 0013 00-8 LIGHTING AND WIPER SYSTEM TROUBLESHOOTING (Contd) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. B.O. HEADLAMP DOES NOT LIGHT Test 1. Test battery voltage at B.O. drive light. 1. Place main light switch lever in OFF position. 2. Disconnect lead 19 from B.O. drive light. 3. Turn main light switch to B.O. DRIVE position. 4. Check for battery voltage on contact end of lead 19. Test 2. Test continuity of filament in B.O. drive light. Set multimeter to RX 1 scale. Check continuity between frame ground and lead 19 attached to rear of B.O. drive light. 1. If battery voltage is present, go to test 2. 2. If battery voltage is not present go to WP 0013 00, table 1, malfunction 1, test 3. 1. If continuity is not present, replace B.O. drive lamp (WP 0123 00). 2. If continuity is present, check for corroded contacts at lamp and at lead 19 connection to front wiring harness. Reconnect lead 19. R.H. FRONT COMPOSITE LIGHT B.O. DRIVE L.H. FRONT COMPOSITE LIGHT R.H. REAR COMPOSITE LIGHT L.H. REAR COMPOSITE LIGHT LIGHT SWITCH B D OFF 75 STOPLIGHT OPEN 75 STOPLIGHT 23 24 21 22-460-461 24 23 20 STOPLIGHT SWITCH 20-483-484 20-24 B.O. TAILLIGHT 20-483-484 15 (BATTERY) —491- 460-461- 491- 461- B.O. MARKER B.O. MARKER B.O. TAILLIGHT B.O. STOPLIGHT B.O. TAILLIGHT B.O. STOPLIGHT VAN BODY B.O. CLEARANCE B.O. MARKER B.O. DRIVE F A K N E D Table 2. Blackout Lights (B.O.) Troubleshooting Procedures. HARNESS CONNECTOR X X X X X X X ~ ~ ~ ~ 19 19 B.O. DRIVE ~ ~ X X X X 21 22-460-461 24 23 X X X X ~ ~ -490 X 24-