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Starter Ground Circuit Resistance Test

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to the right until the engine is cranked. The voltmeter lead clips must be in good contact with the battery posts and the starter terminal. Now, turn the voltmeter selector switch to the No. 4  VOLT  position.  Before cranking  the  engine  with  the  ignition  switch  ON, connect a jumper from the secondary terminal of the coil  to  ground  to  prevent  the  engine  from  starting while it is being tested. While cranking the engine, observe  the  voltmeter  reading  which  should  be  within the  manufacturer’s  specifications.  Unless  otherwise specified by the manufacturer, the voltage loss in each of the circuits shown in views A, B, and C should not exceed the value given. When  you  test  a  6-volt  system,  the  completed circuit  shown  in  view  A  allows  a  0.2  volt  loSS and that of view B, allows a 0.3 volt loss. When you test a  12-volt  system,  the  completed  circuit  shown  in view A allows a 0.4 volt loss and that of view B, a 0.3  volt  loss,  and  that  of  view  C,  a  0.1  volt  loss.  If testing  a  24-  or  32-volt  system,  refer  to  the manufacturer’s   specifications.   If   the   voltmeter reading  is  more  than  specified  for  the  type  of system being tested, high resistance is indicated in the   cables,   switches,   or   connections.   Repeat   the test  with  the  voltmeter  connected  to  each  cable, switch,  and  connector  of  the  circuit.  The  maximum readings taken across these parts should not exceed the values listed below. 6-Volt System 12-Volt  System Each cable 0.1 volt 0.2 volt Each switch 0.1 volt 0.1  volt Each  connector 0.0 volt 0.0 volt STARTER GROUND CIRCUIT RESISTANCE TEST Excessive resistance in the ground circuit of the starting  system  can  cause  sluggish  cranking  action  or failure to crank. It can also seriously interfere with the operations  of  the  electrical  circuits  using  the  same ground. To conduct the starter ground circuit resistance test on  a  6-,  12-,  or  24-volt  series  system,  perform  the following: Connect the  VOLTMETER leads of the tester, as shown in figure 4-26, and observe the polarity as you make the connections. Be sure the voltmeter lead clip at the battery contacts the battery post and not the battery cable clamp. Now, turn the voltmeter selector switch to the No. 4 VOLT position.  Before  cranking  the  engine with the ignition switch  ON, connect a jumper lead from the secondary terminal of the coil to ground to prevent the engine from starting while it is being tested. While cranking the engine, observe the voltmeter reading. Unless  otherwise  specified  by  the  manufacturer’s Figure 4-26.-Starter ground circuit resistance test. 4-14



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