TM 10-6640-238-13 4-33 4-16 EMERGENCY LIGHT BALLAST. This task consists of: a. Remove b. Install INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 1) Equipment Condition Power to lights removed by positioning Main Power Panel circuit breakers; A1CB9, A1CB11, and A1CB13 to OFF. General Safety Instructions WARNING ELECTRICAL SHOCK Before  performing  any  maintenance  actions  on  electrical  equipment,  ensure  all electrical power has been turned off.  Failure to comply with this warning may result in serious injury or death. REMOVE Remove Ballast.  See Figure 4-6. a. Unlatch and open ballast box door (1). b. Disconnect ballast plug (2) from connector (3). c. Remove indicator light (4) by removing tee handle (5) and clamp (6) from bracket (7).  Retain clamp for reuse. d. Remove tee handle (8) and clamp (9) at top of ballast (10) and remove ballast by lifting up from bottom support bracket.  Retain clamp for reuse. INSTALL Install Ballast.  See Figure 4-6. a. Install ballast (10) into bottom support bracket and secure top of ballast with clamp (9) and tee handle (8). b. Install indicator light (4) on bracket (7) and secure with clamp (6) and tee handle (5). c. Connect ballast plug (2) to connector (3). d. Close and latch ballast box door (1).