TM 9-2320-289-20
Table 2-4. Electrical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Wire Color
Key Position
Instructions and Normal Results
Purple/white
“START“
Approximately 12.0 volts at wire. If voltage
is not correct, trace circuit.
Light blue
“ RUN “
Jump wire to ground; glow plug relay
energizes. If relay does not energize, trace
circuit. If circuit is good, replace relay. (See
paragraph 4-8)
Dark blue
Pink/black
Orange
Yellow
"RUN“
“RUN“
“RUN“
“OFF”
Jump wire to ground; “WAIT” light turns on.
If “WAIT” light does not turn on, replace
bulb. (See paragraph 4-7) If “WAIT” light
still does not turn on, trace circuit.
Approximately 12.0 volts at wire. If voltage
is not correct, trace circuit.
Jump
light
blue
wire
to
ground;
Approximately 12.0 volts at orange wire. If
voltage is not correct, trace circuit.
800 ohms (minimum) at wire (engine cold).
If resistance is not correct, trace circuit. If
resistance is still not correct, replace glow
plug switch. (See paragraph 3-20)
Black
"OFF"
0 ohms at wire. Clean connection and
tighten if not correct.
Pink/black and
“OFF”
6-10 ohms between wires. If resistance is
light blue at
not correct, replace glow plug relay. (See
glow plug relay
paragraph 4-8)
16.
“WAIT” LIGHT INOPERATIVE (ENGINE COLD)
Step 1.
Check 20 amp
engine control fuse and 20 amp ignition fuse.
(See
paragraph 4-12)
Replace fuse if burned out.
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