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COIL POLARITY
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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CONDENSER TESTS
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 ELECTRICAL Fig. 5 Chart Showing Extra Voltage Required When Polarity Is Reversed For  a  time,  the  engine  may  run  fine  with  coil  polarity reversed--until  the  spark  plugs  have  been  in  use  for  some time.      Then,   the   driver   may   encounter   hard   starting   or misfiring under load, as the amount of voltage required to fire the  spark  plugs  under  these  conditions  is  higher  than  at  any other time. In   view   of   the   above,   it   is   very   important   that   coil polarity   should   always   be   such   that   negative   current   is supplied to the spark plug terminals. CHECKING FOR REVERSED POLARITY A   quick   and   easy   method   in   checking   for   reversed polarity is the use of an ordinary wooden pencil, Fig. 6.  Using the  wooden  pencil-check  method,  remove  an  ignition  cable from any one of the spark plugs.  Then, place the graphite tip of  the  pencil  between  the  spark  plug  terminal  and  the  cable and  observe  the  spark  as  it  jumps  across  the  gap.    If  you notice the spark flaring or having an orange tinge on the spark plug side of the pencil, polarity is correct.  If it flares or has a tinge on the cable side, polarity is reversed (be sure to use a wooden  pencil  when  making  this  check  or  an  uncomfortable shock  may  be  received  from  the  spark  plugs).    NOTE:  The above check is used particularly on those coils not having any markings  on  the  coil  terminals.    All  coils  recommended  and used   by   the   International   Harvester   Company   are   properly marked. NOTE: When checking for reversed polarity, always be certain that the spark plugs are correctly gapped and in good condition. Fig. 6 Method of Checking for Reversed Polarity CONDENSERS The condenser which is mounted inside ignition system distributor  prevents  arcing  of  distributor  points  when  points begin  to  open  by  providing  a  place  for  current  to  flow  until points  are  safely  separated.    This  requires  special  insulating between the two foil sheets which store current flow and bring it to a quick controlled stop, Fig. 7. Fig. 7 Action of Current on Condenser Ignition  failures  of  a  few  years  back  were  often  the result   of   condenser   breakdown.      Subsequent   investigation proved   that   internal   moisture   was   responsible.      With   the adoption of pre-dried insulating paper and hermetic sealing in recent    years,    condenser    breakdown    has    been    practically eliminated.    Condenser  can  is  crimped  against  outer  gasket and this compresses a spring at bottom of can with 40 pounds pressure  to  effectively  seal  inner  and  outer  gasket  surfaces, Fig.  8.    Pressure  feature  provides  vibration-free  connections which   lessen   the   possibility   of   high   series   resistance   in condenser assembly. CTS-2013-E  Page 6 PRINTED IN UNITED STATES OF AMERICA

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