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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig. 53  Testing With Brown Wire Removed
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 5. Test primary voltage. "Bump"  starter  to  position  sensor  coil  between  two trigger wheel teeth (see Figure 50). Connect voltmeter between coil positive (+) terminal and  ground.    Turn  ignition  switch  "on"  and  observe voltmeter.      If   voltmeter   reads   battery   voltage   (12- 13V), proceed to step 6. If  voltage  is  noticeably  lower  than  battery  voltage,  a high    resistance    exists    between    battery    (through ignition  switch)  and  coil  which  must  be  located  and repaired.  (See Primary Voltage Drop Test). Fig. 50  Testing Primary Voltage 1.  Battery 4.  Voltmeter 2.  Ignition Switch 5.  Sensor Coil Between 3.  Ignition Coil Two Trigger Wheel Teeth 6. Test voltage at coil negative (-) terminal. Sensor   coil   should   be   between   two   trigger   wheel teeth.    Connect  voltmeter  between  coil  negative  (-) terminal and ground (Figure 51). With    ignition    switch    "on",    one    of    the    following voltmeter  readings  will  be  obtained:  (A)  5  to  8  volts (normal) (B) 12 to 13 volts (problem area) (C) 0 to 5 volts (problem area) A. If voltage is 5 to.8 volts: Proceed to Step 7. B. If voltage reading is 12 to 13 volts: Connect jumper wire between distributor housing and battery  negative  (-)  terminal  (Figure  52).    Observe voltmeter. Fig. 51  Testing Voltage at Coil Negative (-) Terminal 1.  Battery 3.  Ignition Coil 2.  Ignition Switch 4.  Voltmeter If voltage remains at 12 - 13 volts, electronic control unit in distributor is faulty and must be replaced. If  voltage  changes  to  5  -  8  volts  with  jumper  wire connected,   a   problem   exists   in   the   ground   circuit between   the   distributor   and   the   battery.      Check battery negative (-) cable (at battery and engine) and cab-to-engine    ground    strap    and/or    other    ground straps.  Repair as needed. Fig. 52.  Testing With Jumper Wire Between Dist.  Housing and Batt.  (-) Terminal. 1.  Battery 4.  Voltmeter 2.  Ignition Switch 5.  Jumper Wire 3.  Ignition Coil CGES-145-U  Page 25 PRINTED IN UNITED STATES OF AMERICA

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