TM 10-6640-215-13 4-23.  REMOVE/INSTALL WALL SWITCHES. This task covers: a. Disassembly c.   Installation b. Removal d.   Assembly INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 2) General Safety Instruction WARNING ELECTRICAL SHOCK Before   performing   any   maintenance   actions   on   electrical   equipment,   ensure   all electrical power has been turned off.  Death or serious injury may occur from failure to do this. DISASSEMBLY Turn off Electrical Power. a. Open appropriate circuit breaker. b. Turn the defective switch to the on position and verify no electrical power to the switch. c. Remove cover. REMOVAL Remove Non-indicating Switch.  See figure 4-12. a. Remove two mounting screws and withdraw defective switch to gain access to wires. b. Loosen terminal screws, tag and disconnect wires and remove switch. INSTALLATION Install Non-indicating Switch.  See figure 4-12. a. Connect wires to new switch and tighten terminal screws. b. Guide new switch into junction box.  Be sure wires are not kinked or strained. c. Install two switch mounting screws. d. Place cover plate on junction box.  Install cover plate screws. 4-52