TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Battery Cables and Connections (013-009)
Section 13 - Electrical Equipment - Group 13
Page 13-23
NOTE: Always connect the negative (-) battery cables last.
Connect all battery cables.
Battery Cables and Connections
(013-009)
Initial Check (013-009-001)
Cranking Circuit or Battery Cable Test
Attach the carbon pile tester and multimeter. Apply 500
amps of load (250 amps for a 24-VDC system), and mea-
sure the positive and negative voltage losses. Add (V1) and
(V2) together for a total battery cable voltage drop. The
measured voltage drop must be less than 0.5 VDC for a
12-VDC system or less than 1 VDC for a 24-VDC system.
If the voltage drops are excessive, repair or replace the
wiring system.
System Voltage
Maximum Voltage Drop
12 VDC
0.5 VDC
24 VDC
1.0 VDC
WARNING
Batteries can emit explosive gases. To avoid personal
injury, always ventilate the compartment before servic-
ing the batteries. To avoid arcing, remove the negative
(-) battery cable first, and attach the negative (-) battery
cable last.
Inspect the battery terminals for loose, broken, or corroded
connections.
Repair or replace broken cables or terminals.
L-1281