TM 9-2320-361-20 Table 2-4. Electrical Troubleshooting (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Step 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. a. Battery voltage should be present at trailer receptacle being tested. b. If battery voltage was present, disconnect and reconnect male connector to ensure posi- tive connection. If trailer lamps still do not light, check male connection for corrosion. If trailer lamps still do not light, check trailer lighting system (TM 9-2320-213-14). c. If battery voltage was not present at one or more of the pins being tested, continue with test 2. Test 2. Test trailer receptacle ground. Step 1. Set multimeter to RX1 scale. Step 2. Connect negative lead of multimeter to frame ground. Touch positive lead to pin D of trailer receptacle. a. Continuity should be present. b. If continuity is not present, replace or repair lead 90 (para. 4-51). 2-147