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Page Title: PRIMARY VOLTAGE DROP TEST
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ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 Clean   cable   terminals   and   apply   a   light   coat   of lubricant/sealer  (IH  part  number  472141-C1)  of  terminals  at assembly.  Make sure cables seat properly on distributor cap and spark plug terminals and in coil tower terminal. Be  sure  ignition  cables  are  routed  correctly.    Proper routing of cables must be maintained to prevent crossfire. PRIMARY VOLTAGE DROP TEST This   test   can   be   used   to   help   locate   any   high resistance    or    loose    connections    in    primary    feed    circuit between the battery and the ignition coil positive (+) terminal. Test Procedure (Refer to Figure 58) 1. Remove  distributor  cap,  rotor  and  shield.    "Bump" starter  to  position  sensor  coil   between   two   trigger wheel teeth. 2. Connect    voltmeter    positive    (red)    lead    to    battery positive   (+)   terminal.      Connect   voltmeter   negative (black) lead to coil positive (+) terminal. 3. Turn  ignition  switch  "on"  and  observe  voltmeter.    A reading of less than 1 volt should be obtained. 4. Check circuit conditions by observing voltmeter while flexing    (moving)    the    connectors    at    the    following locations: a. Battery cables. b. Starter solenoid battery terminal. c. Dash     panel     (bulkhead)     connector     (where used). d. Ammeter terminals. e. Ignition switch connections. If fluctuation or an upswing of the voltmeter needle is observed while flexing the connectors, a poor connection exists and must be corrected. Fig. 58  Primary Voltage Drop Test 1.  Battery 7.  Ammeter 2.  Ignition Switch 8.  Bulkhead Connector 3.  Ignition Coil 9.  To DTM 4.  Distributor 10.  To Alternator 5.  Starter 11.  Voltmeter 6.  Solenoid CGES-145-U  Page 28 PRINTED IN UNITED STATES OF AMERICA

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