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Page Title: VOLTAGE DROP TEST
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TM 9-2320-360-20-1 WARNING · Jewelry   can   catch   on   equipment   and cause   Injury   or   short   across   electrical circuit     and     cause     severe     burns     or electrical shock. Remove rings, bracelets,   watches,   necklaces,   and   any other jewelry before working around HET Tractor. · Batteries    can    explode    from    a    spark. Battery acid Is harmful to skin and eyes. If  skin  is  exposed  to  battery  electrolyte, flush with cold water, and seek Immediate medical attention. Check battery terminals for damaged, loose, corroded, or dirty connections. VOLTAGE DROP TEST (1) Start and operate engine at idle with aid of assistant (TM 9-2320-360-10). (2) Connect multimeter leads to positive (+) terminal and negative (-) terminals of 12 volt batteries.  Record voltage displayed on multimeter. (3) Connect multimeter leads to positive (+) terminal and negative (-) terminals of 24 volt batteries.  Record voltage displayed on multimeter. (4) Shut off engine (TM 9-2320-360-10). (5) Subtract voltage measured at alternators (step 1) from voltage measured at batteries.  The difference is the voltage drop (6) If the voltage drop is greater than 0.10 volt, check the following cables for loose or corroded connections:    Cable no.  1831 from positive (+) terminal on 24 volt alternator to 24 volt alternator circuit breaker.    Cable no 1274 from 24 volt alternator circuit breaker to positive (+) terminal on starter.    Cable no 1139 from positive (+) terminal on starter to batteries    Cable no.  1831A form positive (+) terminal on 12 volt alternator to 12 volt alternator circuit breaker.    Cable no.  1622 from 12 volt alternator circuit breaker to batteries. NOTE Do not replace either alternator until the faulty alternator has been isolated in steps 6, 7, and 8.    It  is  unlikely  that  both  alternators  have failed. Refer to para 7-2b to adjust voltage regulators. Change 2  2-467.1

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