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TROUBLE SHOOTING THE STARTING MOTOR CIRCUIT
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.  5  Control Circuit Test
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 ELECTRICAL Fig.  3  Starting Motor Circuit Excessive   resistance   in   the   starting   or   cranking system   circuit   will   cause   slow   cranking   speeds   and   hard starting.  The starting system will function properly only when the "cranking circuit" and "control circuit" with the components are   in   satisfactory   condition.      Corrosion,   loose   terminal, damaged   or   undersized   cables   (wires)   will   cause   cranking problems.  In addition, the switches involved must make good electrical connections when closed. The   voltage   drop   test   will   be   performed   in   three steps: cranking circuit, control circuit and grounded side. Cranking  Circuit:    Voltage  drops  are  measured  by connecting a voltmeter in parallel across the circuit or section of  a  circuit  being  inspected,  then  reading  the  voltmeter  while circuit is in operation.  To test voltage drop in the cranking Fig.  4  Cranking Circuit Test circuit from battery to starter, connect the voltmeter (observing the polarity and voltage rating of meter) to battery post (not clamp) to starter motor terminal as shown in Fig.  4. Prevent engine from starting during test.  Crank engine and observe voltmeter reading. Values of maximum voltage drops for a standard 12- volt cranking circuit are as follows: Cable under three (3) feet....................... .1 volt Cable over three (3) to six (6) feet .......... .2 volt Mechanical Switch . ............................... .1 volt Solenoid Switch ..................................... .2 volt Magnetic Switch .................................... .3 volt Each Connection.................................... .0 volt Add  these  values together  on  the  particular  chassis being inspected.  For example, if your total of the values from the chart is .5 volt and you have less than .5 volt drop on the chassis, continue to grounded side test. However, if there is more than .5 volt drop you have an excessive voltage drop and this must be located by moving test lead from starting motor and working toward the battery. Crank  engine  with  each  move.    When  a  noticeable  decrease in  the  voltage  reading  is  obtained,  the  trouble  will  be  located between that point and the preceding point checked. Items   which   could   be   at   fault   can   either   be   a damaged  cable  or  poor  connection,  an  undersized  wire  or possibly a bad solenoid (contact within the solenoid).  Repair the fault. CTS-2258-K  Page 5 PRINTED IN UNITED STATES OF AMERICA

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