TM 5-6115-593-12 TO 35C2-3-463-1 (2) Inspect  connections  for  security  and condition. (3) Inspect wiring for defective insulation. b.   Test.        Perform    continuity    check,    using ohmmeter between connecting points in the wiring harness. (See FO-7, Control Cubicle, Wiring   Diagram.)   Check   for   short   circuits between     connector     pins     of     the     same receptacle or terminal board. c.   Repair. (1) If a broken wire is accessible, remove sufficient insulation from each side of the  break  to  allow  a  good  connection of  the  bared  ends  by  twisting  them together.  Solder  the  connection  and wrap with electrical tape. (2) If  a  wire  is  broken  from  a    terminal lug,   replace   the   lug.      If   a   wire   is broken from a connector, resolder and reassemble. CAUTION Under     no     condition     leave     the     bare connection exposed. (3) If  a  break  in  the  wire  is  inaccessible within  the  wiring  harness,  disconnect it  at  both  ends  and  tape  both  ends. Lace  a  new  lead  of  the  same  gauge and   insulation   outside   the   harness and connect it to the proper terminals or pins.  Properly tag both ends of all replacement wires. d.   Replacement.  If 30 percent of the harness wires   are   defective,   refer   to   next   higher level of maintenance for replacement. Section XIII.  MAINTENANCE OF AIR CLEANER 4-42.  AIR CLEANER.  (See figure 4-23.) a.   Removal.      Remove   both   air   cleaners   as follows: (1) Loosen eight hose clamps (24). (2)   Remove   six   screws   (15),   nuts   (16), and  lockwashers  (17)  from  mounting brackets (18 and 19). (3) Remove air cleaners (29). b.   Service.      Check   the   air   cleaner   service indicator.    If  indicator  is  in  red,  proceed  as follows (see figure 3-1): (1)   Remove   and   empty   dust   cup   (13) when three-quarters full. (2)   Reinstall   dust   cup   (13)   and   O-ring (14). (3)   Clean   air   cleaner   tubes   with   a   stiff brush.    If  heavy  plugging  is  evident, remove  lower  body  section  (15)  and clean   with   compressed   air   or   water not exceeding 1600F (71°C). CAUTION Never     clean     air     cleaner     tubes     with compressed air unless both filter elements  are  installed  in  the  air  cleaner. Do not steam clean air cleaner tubes. (4) Unfasten   cover   latches   and   remove cover  (1).    Remove  wing  nut  (3)  and remove primary filter element (4). (5) Remove cotter pin (5), castellated nut (6), and safety filter element (7).Replace    with    new    element    at interval   indicated   in   table   4-2   and secure   with   castellated   nut   (6)   and cotter  pin  (5).    Do  not  clean  safety filter element (7). (6) Clean   primary   filter   element   (4)   by either method (a) or (b), as follows: 4-71