TM 10-6640-215-13 4-23.  REMOVE/INSTALL WALL SWITCHES -  continued. ASSEMBLY Turn on Electrical Power. a. Close appropriate circuit breaker. b. Turn the new switch to the on position and verify proper operation. 4-24.  REMOVE/REPLACE BLACKOUT MICROSWITCH. This task covers: a.   Removal c.   Adjustment b.   Installation INITIAL SET-UP: Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 2) General Safety Instructions WARNING ELECTRICAL SHOCK Before performing an) maintenance actions on electrical equipment, ensure all electrical power has been turned off.  Death or serious injury may occur from failure to do this. REMOVAL Remove Blackout Microswitch.  See figure 4-13. a. Open appropriate circuit breaker located in the power panel assembly. b. Verify all semi-trailer van lighting is off to indicate power has been removed from microswitch. c. Remove cover plate screws, flatwashers, NSN plates and remove cover plate. d. Remove switch mounting screws and pull switch forward. e. Tag for reconnection and disconnect electrical leads. f. Remove defective switch. INSTALLATION Install Blackout Microswitch.  See figure 4-13. a. Connect wires as tagged and remove tags. 4-54