TM 5-2420-230-24-2
Electrical Equipment - General Information
B3.9 and B5.9 Series Engines
Page 13-2
Section 13 - Electrical Equipment - Group 13
Electrical Equipment - General
Information
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.
WARNING
To avoid personal injury, keep hands, long hair, jewelry,
and loose-fitting or torn clothing away from fans and
other moving parts.
The basic electrical system consists of:
Batteries (1)
A starter motor (2)
An alternator (3)
A magnetic switch (4)
An ignition switch (5)
All necessary wiring.
All components must be carefully matched.
The rotary injection pump uses an electrical fuel shutoff
valve. The in-line injection pump uses an electrically acti-
vated solenoid shutdown system. The function of the valve
is discussed in the fuel system section.
The engine will have temperature and oil pressure sensors
connected to indicators or wired for automatic shutdown.
The engine can also be fitted with a block heater, oil pan
heater, or intake manifold air heater.
NOTE: When troubleshooting a Cummins B Series gen-
erator set, refer to the Operation and Maintenance Manual,
B Series Engines, Bulletin No. 3810205.
The accompanying illustrations show typical parallel and
series connections:
Parallel connection.
L-1260
