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Page 15
With the engine
running,
carefully
open the starter
shunt as shown
in Key 10 on page
6
.
Observe
the current
(amps)
reading on the
0-100 Amps scale, reduce
engine
speed to curb idle and compare meter
reading with the manufacturer's
specifications.
ALTERNATOR FULL FIELD
NOTE:
To determine the actual output current, add 5 amperes to the meter
reading obtained during the output test.
This is the approximate current
used by the ignition system, dash instruments and alternator field toll
combined which does not reach the battery to be measured during
this test.
If the meter reading is at or higher than specified, the
alternator output is satisfactory.
If the meter reading Is less than
specified, a loose or worn alternator drive belt, a faulty field or
battery wire to the alternator, or a poorly grounded or defective alternator
is indicated.
If the meter reading is to the left of zero, a broken
field wire or a defective alternator is indicated.
(Meter reading is the
battery discharge current used by the ignition system and dash instruments.)
6.
When test is completed, shut off the engine, disconnect jumper lead,
remove the shunt, and reconnect wiring harness plug, connector or
field wire to the regulator for normal operation,
Repeat Test Number 4:±Charging System Vp]tage and Current
If the voltage reading is within the range as specified by the vehicle
service manual, (typically between i3.8 and 15.2 volts on 12 volt systems,
and 27.6 and 30.4 on 24 volt systems) the regulator is satisfactory.
If the voltage reading is out of specifications but satisfactory
operation was obtained on the CHARGING SYSTEM VOLTAGE AND CURRENT and
ALTERNATOR CONDITION tests, the voltage regulator should be adjusted
(if possible) or replaced.
Test Number B--Battery
Repeat Test Number4-,ChargingSystemvo]tage
and Current
After the VOLTAGE REGULATOR--TEST 7 is completed, the regulator should
be functioning satisfactorily, leaving the battery as the only untested
component remaining in the CHARGING SYSTEM.
To
test battery condition,
attach the shunt to the BATTERY POST ADAPTER (Key I
Page 5 ), start
the engine, and operate it at approximately 1200 RPM.
If the voltage
reading is less than 13.8 volts, check the water level in the battery and
fill to the proper level, if necessary.
Charge the battery and repeat
this test.
if the voltage reading is still low, the battery is defective
and should be replaced.
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