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Test primary voltage.
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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SECONDARY CIRUCIT INSPECTION
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 C. If voltage is 0 to 5 volts: Disconnect voltmeter.  Remove brown wire from coil negative  (-)  terminal.    Reconnect  voltmeter  between coil   negative   (-)   terminal   and   ground   (Figure   53). With   ignition   switch   "on",   observe   voltmeter.      If voltage reading is still 0 to 5 volts, coil is faulty and must be replaced. If voltage increases to 12 - 13 volts, electronic control unit in distributor is faulty, and must be replaced. Reconnect brown wire to coil (negative (-) terminal). Fig. 53  Testing With Brown Wire Removed 1.  Battery 3.  Ignition Coil 2.  Ignition Switch 4.  Voltmeter 7. Test control unit operation. Voltmeter should be connected between coil negative (-) terminal and ground (Figure 53). With  ignition  switch  "on",  place  blade  of  screwdriver against  face  of  sensor  (Figure  54)  while  observing voltmeter.  Voltage should increase to 12 - 13 volts. Remove screwdriver blade.  Voltage should drop to 5 - 8 volts. If voltage switches up and down, proceed to step 8. If    voltage    does    not    switch    up    and    down    when screwdriver     blade     is     placed     against     and     then removed  from  face  of  sensor,  electronic  control  unit in distributor is faulty and must be replaced. 8. Test Coil Operation Re-establish   the   13   mm   (1/2   inch)   gap   between extension   adapter   (connected   to   coil   high   tension cable) and engine (Figure 55). Fig. 54  Testing Electronic Control Unit Operation 1.  Battery 3.  Ignition Coil 2.  Ignition Switch 4.  Voltmeter 5.  Screwdriver Fig. 55  Testing Coil Operation 1.  Battery 3.  Ignition Coil 2.  Ignition Switch 4.  13 mm (1/2 in.) gap 5.  Screwdriver With  ignition  switch  "on"  observe  for  spark  across gap  each  time  screwdriver  blade  is  placed  against face of sensor. If    no    spark    occurs,    coil    is    faulty    and    must    be replaced. 9. Retest for Spark at Plug. After replacing components, disconnect test equipment.  Reinstall shield, rotor and distributor cap and  reconnect  coil  high  tension  cable  to  distributor cap. Recheck for spark at spark plug (Step 2). CGES-145-U  Page 26 PRINTED IN UNITED STATES OF AMERICA

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