TM 5-2420-230-24-2
Batteries (013-007)
B3.9 and B5.9 Series Engines
Page 13-22
Section 13 - Electrical Equipment - Group 13
CAUTION
Do not connect battery charging cables to any elec-
tronic control system part. This can damage the elec-
tronic control system parts.
Systems Analyzer/Battery Tester, Part No. 3377193
Use the systems analyzer/battery tester, Part No. 3377193,
to test the output amperage of maintenance-free or con-
ventional vent-cap batteries.
If the output amperage is low, use a battery charger to
charge the battery. Refer to the manufacturer's instruc-
tions.
Replace the battery if it will not charge to the manufac-
turer's specifications or will not maintain a charge.
Refer to the accompanying table to determine the battery
state of charge based on the specific-gravity readings.
Battery State of Charge
Specific Gravity @ 27C
[80F]
100%
1.260 to 1.280
75%
1.230 to 1.250
50%
1.200 to 1.220
25%
1.170 to 1.190
Discharged
1.110 to 1.130
All batteries, including maintenance-free ones, can be
checked by measuring the voltage between the positive
(+) battery cable and the engine block ground (-). Note the
voltage.
Using a remote start connection, attempt to engage the
starter while observing the voltage.
If the voltage reads less than 10 VDC, charge the battery.
If the voltage drops rapidly more than 2 VDC, replace the
battery.
L-1280
