TM 9-2320-387-24-I
INSTRUMENTS CIRCUIT
&‘->
-
I
fEST opT,o~lAGNOSTIC
FLOWCHART
I
KNOWN INFO
ONE OR MORE
GAUGES AND
WARNING LAMPS
DON7 WORK
VISUAL
REASON FOR QUESTION
WITH THE ROTARY SWITCH IN
THE ENGINE STOP POSITION,
ARE ALL THE GAUGES IN THE
OFF POSITION AND WARNING
LAMPS OFF?
POSSIBLE
PROBLEMS
If any of the gauges or lamps are
functioning, then the electrical
system is partially powered in the
OFF position.
MASTER POWER
INSTRUMENTS
WIRING
SENDING UNITS
KNOWN INFO
’ OPTIONS
VISUAL
TURN THE ROTARY SWITCH OFF.
DISCONNECT THE GLOW PLUG
CONTROLLER. WITH THE
ROTARY SWITCH IN THE RUN
POSITION, DO ANY OF THE
GAUGES AND WARNING LAMPS
FUNCTION?
NO POWER TO THE
GAUGES WITH THE
ROTARY SWITCH IN
THE OFF POSlTlON
REASON FOR QUESTION
If any of the devices work, the
master power circuit works.
POSSIBLE
PROBLEMS
MASTER POWER
r
KNOWN INFO
TEST OPTIONS
VISUAL
‘OWER AVAIlABLE
TO GAUGES AND
WARNING LAMPS
TURN THE ROTARY SWITCH OFF.
RECONNECT THE GLOW PLUG
CONTROLLER. TURN THE ROTARY
SWITCH ON. DOES THE WAIT-TO-
START LAMP COME ON AT ANY
TIME? (ENGINE TEMPERATURE
MUST BE BELOW 120 “F (49°C)).
REASON FOR QUESTION
If the wait-to-start light comes on
at any time. the circuit is being
powered.
POSSIBLE PROBLEMS
INSTRUMENTS
WIRING
SENDING UNITS
2-306
