TM 55-1520-240-T CHAPTER 9 ELECTRICAL SYSTEM TROUBLESHOOTING CHAPTER OVERVIEW Chapter 9 contains procedures for Electrical System troubleshooting.  Each system and failure symptom is listed below.  Included in this chapter are locations and views of all electrical connectors, receptacles, relays, and ground connections for the Electrical System. Refer to TM 55-1520-240-23 for required maintenance procedures. SYSTEM PARA DC POWER SYSTEM 9-1 AC POWER SYSTEM 9-2 POSITION LIGHTS 9-3 LANDING (SEARCHLIGHTS) 9-4 FORMATION LIGHTS 9-5 ANTICOLLISION LIGHTS 9-6 MAINTENANCE LIGHTS 9-7 PILOT'S FLIGHT INSTRUMENT PANEL LIGHTS 9-8 SYMPTOM TASK ANTICOLLISION LIGHTS DO NOT FLASH, NO. 1 DC SYSTEM TURNED OFF 9-1.4 ANTICOLLISION LIGHTS DO NOT FLASH, NO. 2 DC SYSTEM TURNED OFF 9-1.4 BATTERY CHARGING AND CHARGE COMPLETE LIGHTS OUT 9-1.4 BATTERY CHARGING OR CHARGE COMPLETE LIGHT DOES NOT COME ON WHEN PRESSED 9-1.4 BATTERY SYSTEM MAL CAPSULE (WITHOUT  74) OR MALF CAPSULE (WITH 74)ON.   9-1.4 CABIN AND RAMP LIGHTS NOT POWERED FROM SWITCH- ING BATTERY BUSS 9-1.4 EXTERNAL DC SUPPLY DOES NOT POWER DC BUSSES 9-1.4 EXTERNAL PWR CAPSULE OUT WHEN EXTERNAL DC SUP- PLY CONNECTED 9-1.4 EXT PWR CONT CIRCUIT BREAKER WILL NOT STAY CLOSED WITH EXTERNAL POWER APPLIED 9-1.4 MASTER CAUTION LIGHTS DO NOT COME ON WHEN BAT- TERY SWITCH SET TO ON 9-1.4 RECT 1 AND  RECT 2 CAPSULES OUT WHEN EXTERNAL DC SUPPLY CONNECTED 9-1.4 SYSTEM PARA CENTER FLIGHT INSTRUMENT PANEL LIGHTS 9-9 COPILOT'S FLIGHT INSTRUMENT PANEL LIGHTS 9-10 OVERHEAD PANEL LIGHTS 9-11 CONSOLE PANEL LIGHTS 9-12 SECONDARY COCKPIT LIGHTS 9-13 COCKPIT DOME AND UTILITY LIGHTS 9-14 CABIN AND RAMP LIGHTS 9-15 TROOP WARNING SYSTEM 9-16 FAILURE SYMPTOM LIST DC POWER SYSTEM SYMPTOM TASK NO. 1 AND NO. 2  RECT OFF CAPSULE OUT WHEN EXTER- NAL DC SUPPLY CONNECTED 9-1.4 RECT 1 OR  RECT 2 CAPSULE NOT ON (WITH  74) 9-1.4 NO. 1 OR NO. 2 RECT OFF CAPSULE NOT ON (WITHOUT 74) 9-1.4 RECT 1 CAPSULE ON WHEN  APU IS RUNNING (WITH 74) 9-1.4 NO. 1 RECT OFF CAPSULE ON WHEN  APU RUNNING (WITHOUT 74) 9-1.4 RECT 2 CAPSULE ON WHEN  APU IS RUNNING (WITH 74) 9-1.4 NO. 2 RECT OFF CAPSULE ON WHEN  APU RUNNING (WITHOUT 74) 9-1.4 OVERHEAD PANEL LIGHTS DO NOT COME ON NO. 1 DC SYSTEM TURNED OFF 9-1.4 OVERHEAD PANEL LIGHTS DO NOT COME ON, NO. 1 DC SYSTEM TURNED ON 9-1.4 SWITCHED BATTERY BUS OR ESSENTIAL BUS NOT POW- ERED BY NO. 1 DC BUS 9-1.4 EXTERNAL POWER CAPSULE NOT ON (EXTERNAL POWER APPLIED) 9-2.4 SYSTEM PARA UTILITY RECEPTACLES 9-17 MASTER CAUTION SYSTEM 9-18 AVIONICS COOLING FAN 9-19 ANTICOLLISION LIGHT (AVIM) 9-20 MASTER CAUTION PANEL (AVIM) 9-21 CLOCK 9-22 CARGO HOOK LIGHTS 9-23 SYMPTOM TASK NO. 1 AND NO. 2  RECT OFF CAPSULES ON (EXTERNAL POWER ON) (WITHOUT 74) 9-2.4 RECT 1 AND  RECT 2 CAPSULES ON (EXTERNAL POWER ON) (WITH  74) 9-2.4 NO. 1 AND NO. 2  RECT OFF CAPSULES ON (NO. 1 GENERA- TOR SELECTED (WITHOUT 74) 9-2.4 RECT 1 AND  RECT 2 CAPSULES ON (NO. 1 GENERATOR SE- LECTED) (WITH 74) 9-2.4 NO. 1 AND NO. 2  RECT OFF CAPSULES ON (NO. 2 GENERA- TOR SELECTED) (WITHOUT 74) 9-2.4 RECT 1 AND  RECT 2 CAPSULES ON (NO. 2 GENERATOR SE- LECTED) (WITH 74) 9-2.4 NO. 1 AND NO. 2  RECT OFF CAUTION LIGHTS ON (WITH- OUT 74) 9-2.4 GEN 1 CAPSULE IS ON (GENERATOR SWITCH ON) (WITH 74) 9-2.4 NO. 1 GENERATOR OFF CAPSULE STAYS ON (GENERATOR SWITCH IN TEST) (WITHOUT  74) 9-2.4 Change 19  9-2.1