REFERENCE INFORMATION
FUEL SYSTEM
You should only run the engine
lpng enough to determine the
gauge reading because engine
temperature must stay below
90° F (33O C) for the cold-advance
circuit to function.
BATTERY VOLTAGE
MULTlMElER
I. Set the voltmeter to a DC volts scale of at least
40 volts.
2. Connect the RED lead to positive and the
BLACK lead to negative.
3. Be sure to read the correct scale.
DC VOLTAGE 9-45 VOLTS
STUICE-R TEST 89
1. Connect RED clip to positive. BLACK dip to
negative or ground.
2. Start Test 99, DC volts.
3. Displayed reading is in volts.
1.
2.
3.
4.
Shut off engine.
Disconnect wire 569 at cotd-
advance switch.
Turn rotary switch to RUN
oosition.
‘Check for battery
569.
voltage at wire
Repair/replace harness
(para. 4-90).
NOTE
Engine temperature
must be less than
WF
(330 C) when testing
the switch.
Replace cold-adavance
swftch (para. 4-31).
Repair/replace harness
(para. 4-30).
TM 9-2320-387-24-l
.
COLD-ADVANCE
CIRCLET
FROM PROTECTWE
CONTROL
BOX
I
Alternator output is hot
when the rotary switch is
in the RUNposition.
Cold-advance switch is
closed when engine
temperature is below
90°F (33°C) and open
when it goes above
120°F (49%).
The cold-advance
solenoid advances the
injection pump timing
when it receives power
from the switch. This
helps the engine run
better when it is cold.
2-l 35
