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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 2-467.2
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