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Fig. 53  Testing With Brown Wire Removed
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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PRIMARY VOLTAGE DROP TEST
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 10. Check Dwell. Connect dwell meter to engine.  Operate engine and observe dwell reading. If necessary, re-adjust trigger wheel-to-sensor air gap to obtain specified dwell. 11. Check Timing. Connect  timing  light  to  engine.    Operate  engine  at idle   speed   (distributor   vacuum   hose   disconnected) and check timing.  Adjust timing if necessary. SECONDARY CIRUCIT INSPECTION Secondary (high voltage) system components (distributor   cap,   rotor,   coil,   high   tension   cables   and   spark plugs)   should   be   checked   as   possible   sources   of   trouble before condemning the electronic units. Distributor Cap and Rotor Inspect  distributor  cap  and  rotor  for  cracks,  carbon tracking,  loose  terminals,  dirt  and  contamination.    Clean  or replace as needed. Check rotor blade and spring for tightness.  Check fit of rotor on distributor shaft.  Check resistance type rotor with ohmmeter.    (Figure  56).    If  resistance  exceeds  6000  ohms, replace rotor. Fig. 56  Rotor Resistance Test 1. Ohms X1000 Meter 2.  Resistor Coil Inspect coil tower for cracks or carbon tracking. Inspect primary terminals for corrosion and/or looseness. Replace coil if any of these conditions are found. Test resistance of coil primary and secondary circuits with an ohmmeter (See Figure 57). COIL RESISTANCE TESTS Fig. 57  Coil Resistance Tests 1.  Primary Circuit 3.  Secondary Circuit 2.  Ohms X1 4.  Ohms X1000 If coil resistance tests are made with coil mounted in vehicle,  coil  must  be  electrically  isolated  from  the  vehicle's electrical   system   by   disconnecting   primary   leads   from   coil terminals and removing secondary cable from coil tower. Set    ohmmeter    in    OHM    x    1    position.    Connect ohmmeter between coil primary terminals.  Reading should be between 1.2 and 1.4 ohms at 21 degrees C (70 degrees F). Set   ohmmeter   in   OHM   x   1000   position.   Connect ohmmeter   between   one   coil   primary   terminal   and   the   coil tower  terminal.    Reading  should  be  within  9,000  to  12,000 ohms at 21 degrees C (70 degrees F). If coil fails either resistance test, replace it. High Tension Cables Inspect  secondary  (high  tension)  ignition  cables  for deterioration,   carbon   tracking   at   terminal   boots   and   high voltage leakage, especially at cable support brackets. Test     resistance     of     cables     with     an     ohmmeter. Resistance  should  not  exceed  30,000  ohms  on  cables  up  to 914  mm  (36")  long  or  45,000  ohms  on  cables  over  914  mm (36") long. Check sealing and insulating qualities, of distributor cap, coil tower and spark plug boots.  Replace if needed. CGES-145-U  Page 27 PRINTED IN UNITED STATES OF AMERICA

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