TM 9-2330-381-14
2-30.
APU JUMP START
When the APU battery has been discharged to a point where it cannot start the APU, proceed as follows:
a. Perform steps (1) thru (5) of paragraph 2-16a to ensure that APU is ready to be started.
WARNING
Remove all jewelry such as rings, dog tags, bracelets, etc., when jump starting
APU. Wearing jewelry may result in electrical shock and injury to personnel.
Storage batteries give off hydrogen gas which is extremely explosive. Keep all
open flames, sparks, and smoking materials away from batteries while connecting
for jump start or injury to personnel may result.
b. If tractor is coupled to semitrailer, start tractor engine and open battery box. If tractor and semitrailer are not
coupled, position tractor near gooseneck to where tractor batteries are approximately 15 to 20 feet (4.5 to 6.0m)
from APU jump start cable storage bag (1). Keep tractor engine running and open tractor battery box.
c. Loosen drawstring of cable storage bag (1) and pull out jumper cables (2 and 3). The negative (-) cable (3) is
approximately 9 feet (2.75m) in length and has a black clamp on the end. The positive (+) cable (2) is 28 feet
(8.5m) in length and has a red clamp on the end.
NOTE
The tractor operates on 12-Vdc and 24-Vdc systems. Two tractor batteries are
connected in a series for the 24-Vdc requirements, and two tractor batteries are
connected in parallel for the 12-volt requirement. The APU electrical system
requires only 12 Vdc, and the jump start system electrical box will not permit more
than 12 Vdc to be applied to the APU. The positive (red) clamp of the APU Jumper
cable must be connected only to a 12-Vdc output.
d. Connect positive (red) clamps on cable (2) to positive (+) terminal on either of tractor batteries that have their
positive (+) terminals connected together (parallel connections).
e. Connect negative (black) clamp on cable (3) to frame of tractor and ensure a good connection.
f. Press switch (4) on electrical box (5). If system is installed correctly, an audible click will be heard from inside
electrical box.
g. Open cover on APU control box. Press knob and pull throttle control (6) full outboard.
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