TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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TM 9-2320-361-24-1 0013 00 0013 00-22 LIGHTING AND WIPER SYSTEM TROUBLESHOOTING (Contd) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION ONE OR MORE TRAILER LIGHTS INOPERATIVE NOTE For stoplight circuit test, brake pedal must be depressed and air pressure maintained. Test 1. Test trailer receptacle voltage. 1. Place main light switch lever in position corresponding to inoperative lamp. 2. Set multimeter to voltage range that will measure 24 VDC. 3. Connect negative lead of multimeter to trailer receptacle pin D. Touch positive lead to appropriate trailer receptacle pin of circuit being tested. Light switch must be in corresponding position. Test 2. Test trailer receptacle ground. 1. Set multimeter to RX 1 scale. 2. Connect negative lead of multimeter to frame ground. Touch positive lead to pin D of trailer receptacle. 1. If battery voltage is present, disconnect and reconnect male connector to ensure positive connection. If trailer lamps still do not light, check trailer lighting system. 2. If battery voltage is not present at one or more of the pins being tested, continue with test 2. If continuity is not present, repair or replace lead 90 (WP 0090 00). Table 4. Trailer Connection System Troubleshooting Procedures. H G D C E B F A L K N J M H C A B E F D INTAKE FUEL PUMP FUEL TANK SENDING UNIT 90 490 B.O. CLEARANCE 489 CLEARANCE REAR HARNESS TRAILER RECEPTACLE