TM 9-6115-664-13&P
11 START / PRIME RUN / OFF Switch (A4-S1) Three
position switch that controls APU operation.
START position activates engine starter. Spring
loaded. Must be held in place.
PRIME - RUN position cuts electrical power to
starter. Energizes all circuits required for normal
operation. When unit is not running, fuel pump
is energized to prime fuel system.
OFF position cuts electrical power to the engine
shutdown solenoid, causing APU shutdown.
12 APU ON Indicator Illuminates when APU contactor is
closed.
13 PRESS TO TEST LAMPS Push Button (A4-S6)
Tests remote control panel indicator lights for proper
operation.
14 APU ON Switch (A4-S4) Energizes latching relay
A1-K3, turning on the alternator and closing the
contactor.
15 BATTLE SHORT Switch (S5) Placing switch in ON
position
bypasses
protective
device
shutdown
circuit. OFF position enables shut-down circuit to
operate.
16 PREHEAT OIL / AIR Switch (A4-S2) Activates
engine air or oil glow plugs for cold weather starts.
Spring loaded.
17 AIR P.H. Indicator Located on preheat module.
Illuminates when air heater elements are energized.
18 OIL P.H. Indicator Located on preheat module.
Illuminates when oil heater elements are energized.
Figure 2-1. Controls and Indicators
(Sheet 3 of 4)
2-4
