TM 10-3930-675-20-1
0025 00-25
ENGINE BATTERY VOLTAGE CIRCUITS TROUBLESHOOTING - CONTINUED
0025 00
Table 7. Error Code 1598 - Voltage Monitor, Very Low Voltage Failure Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 1598 - Voltage Monitor, Very Low
Voltage Failure - Continued
3. Turn ignition switch to OFF
position and measure battery
voltage from positive (+)
terminal
to
negative
(-)
terminal. Voltage should be
+12V. Check voltage while
trying to start engine. Voltage
should be at least +6V during
cranking. Check each battery in
same way.
If voltage is not as specified,
service or replace battery (WP
0107 00).
4. Place ignition switch in OFF
position. Install an ammeter
between alternator and battery.
Perform the following steps to
check
charging
rate
of
alternator:
If alternator is not charging
properly, replace alternator (WP
0069 00).
a. Check battery voltage at
slave receptacle with engine
off.
b. Start engine and recheck
voltage. Voltage should be
slightly higher than voltage
checked with engine off.
c. Turn on lights. Check
amperage
reading
on
ammeter with engine on.
Ammeter should have a
positive (more or less)
reading depending on charge
of batteries.
DC AMMETER
LIGHTS ON
SLAVE RECEPTACLE
VOLTAGE ENGINE ON>
VOLTAGE ENGINE OFF
+AMPERAGE CHARGE
WITH ENGINE ON
B+
