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DESCRIPTION - TM-5-4210-230-14P-1_439
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ADJUSTMENT - TM-5-4210-230-14P-1_441
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 ELECTRICAL TROUBLE SHOOTING Before   performing   trouble   shooting   procedures   on   the vehicle,  be  absolutely  certain  that  wiring  is  not  defective  and belts are not slipping, as these problems are common. To  determine  if  the  problem  lies  in  the  regulator  or  the alternator,   connect   an   accurate   voltmeter   across   the   battery with  the  engine  stopped,  and  note  the  reading.    The  engine should    now    be    started.        If    the    voltmeter    reading    rises excessively,   the   charging   system   may   be   defective   or   may require adjustment.  Remove the nylon screw from the regulator and  with  the  engine  at  approximately  1000  RPM,  attempt  to bring the voltage to its proper value (13.8-14.2 V approximately) by   turning   the   adjusting   screw   back   and   forth   with   a   small screwdriver (see Fig.  1). If the voltage is excessively high and cannot be lowered by means of the adjustment, the regulator is probably defective and should be replaced.  If the output voltage cannot be raised, either the alternator, regulator or diode trio may be at fault.  To determine  if  the  fault  is  in  the  regulator  or  in  the  alternator, perform the following test. Connect one end of a short jumper lead to the negative alternator   output   terminal   and   connect   the   other   end   of   the jumper to a short stiff piece of wire at least 38 mm (1 1/2") long. A piece of paper clip wire will be suitable.  Insert this wire into the  small  hole  in  the  end  of  the  brush  holder  so  that  it  firmly contacts the outer brush terminal.  (see Fig.  2). If  the  voltmeter  reading  now  rises  with  the  engine  at  a fast idle, the alternator is OK and the fault is in the regulator or diode trio.  Remove the diode trio and test (see "COMPONENT TESTING").  If the diode trio tests OK, the regulator should be replaced. If   the   voltage   fails   to   rise   when   performing   this   test, remove the regulator and carefully inspect it for a printed circuit track which has burned open.  If this condition is found, replace the  regulator.    Check  the  brush  spring  caps  and  their  contact screws   for   dirt   or   corrosion   and   clean   if   necessary.      If   the alternator  does  not  operate  after  performing  either  or  both  of these operations, the alternator should be removed for repair or replacement. FIG.  3 The  alternator  may  also  be  checked  for  output  across each phase by using a test light as shown in Fig.  3.  The test light  should  be  constructed  from  a  two  filament  sealed  beam unit   connected   in   such   a   manner   that   the   filaments   are   in parallel.  Such a light will act as a load a as well as an indicator, and  should  light  with  equal  brilliancy  on  each  phase.    If  the lamp  is  noticeably  dimmer  on  one  or  two  phases,  a  defective diode trio or power diode is indicated. If the diode trio tests OK, then the alternator must be removed and dismantled for further tests. CTS-2743T  Page 4 PRINTED IN UNITED STATES OF  AMERICA

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