TM 9-2320-209-10-1 (4) Operating 24-volt dome lights under blackout conditions. FRAME 1 1. Place POWER SWITCH 115-VAC handle (1) in ON (up) position. 2. Place dome light toggle switch (2) in ON position. 3. Place OPERATION BLACKOUT SWITCH 115-VAC SYSTEM (3) in (up) ON position. 4. Place dome light toggle switch (4) in BLACKOUT position. 5. Open and close rear door to check blackout action. 4-215