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INDEX - TM-5-4210-230-14P-1_626
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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LIGHTING     SWITCH     (WITH     PROTECTION     FUSE     AND CIRCUIT BREAKER).
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 ELECTRICAL LIGHTING     SWITCH     (LESS     PROTECTION     FUSE     BUT EQUIPPED WITH A CIRCUIT BREAKER). Description And Operation The  lighting  switch  illustrated  in  Figure  1  does  not incorporate fuses in the switch assembly, but is protected by a circuit breaker. When  the  lighting  switch  knob  is  pulled  out  to  the first   position,   the   parking   lights,   tail   lights   and   instrument lights are on.  When the lighting switch knob is pulled out to the last position, all lights are on. Fig. 1. Removal 1. Pull light switch knob outward to headlight position. 2. Loosen  Allen  screw  in  knob  and  remove  knob  from shaft. 3. Remove furrule nut. 4. Disconnect all wires from  the  switch.    Tag  wires  for proper installation. LIGHTING     SWITCH     (LESS     PROTECTION     FUSE     AND CIRCUIT BREAKER). Description and Operation This     type     lighting     switch,     Fig.          2,     does     not incorporate a circuit breaker or fuses as the lighting system is protected by a fuse panel. Fig.  2. The  lighting  switch  on  the  instrument  panel  controls the   headlights,   parking   lights,   instrument   panel   lights,   cab interior light and tail lights.  When the lighting switch is pulled out halfway, both parking and tail lights are "on".  To light the instrument  panel,  turn  the  light  switch  control  to  the  left;  a built-in  rheostat  controls  the  intensity  of  the  panel  light  from "off"  to  full  "on".    To  turn  the  cab  interior  light  on,  turn  the lighting   switch   control   counterclockwise   to   the   extreme   left position. Removal 1. Pull light switch outward to headlight position. 2. Depress shaft release button, Fig.  3, on switch body and pull knob and shaft out of switch body. 3. Remove  ferrule  nut  by  positioning  a  screw  driver  in the end, turn nut in a counterclockwise direction. 4. Disconnect   all   wires   from   the   lighting   switch   and either  tag  them  for  correct  installation  or  note  the relation of each wire to its proper terminal. Fig.  3. LIGHTING     SWITCH     (WITH     PROTECTION     FUSE     AND CIRCUIT BREAKER). Description and Operation This  type  lighting  switch,   Fig.      4,   incorporates   15 amperes  dual  thermal  circuit  breakers  and  a  fuse  to  protect the  entire  lighting  system.    One  circuit  breaker  protects  the headlights   and   parking   lights,   while   all   other   lights   on   the vehicle are directed through the remaining circuit breaker.  In addition, the panel lights are also protected by a (4 amp) fuse. This  type  of  circuit  permits  the  use  of  the  headlights  to  be retained if an overload or short develops in another part of the system.    A  current  flow  of  more  than  15  amperes  will  cause the points of this current limit relay to open and close as they warm and cool.  Thus CTS-2293  Page 3 PRINTED IN UNITED STATES OF AMERICA

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