TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 727 of 1313
ENGINE WILL NOT CRANK; SOME ELECTRICAL SYSTEMS INOPERATIVE OR WEAK - Continued
STEP
5.
IS BATTERY VOLTAGE DROP 1 VOLT OR GREATER UNDER LOAD?
a.
Set up multimeter to measure VDC.
T0682DAA
STARTER
SOLENOID
STARTER
MOTOR
Figure 5.
Battery/Solenoid Voltage Test.
b.
Connect multimeter red lead to starter, terminal 6. Refer to point to point schematics.
c.
Connect multimeter black lead to ground.
d.
Note meter reading.
e.
Turn headlight switch and battery switch to ON position for 15 seconds (headlights on bright).
f.
Voltage should not drop more than 1 volt.
CONDITION/INDICATION
IS BATTERY VOLTAGE DROP 1 VOLT OR GREATER UNDER LOAD?
DECISION
YES - Recharge batteries (Volume 2, WP
0346). Go to Step (6) to verify problem is solved.
NO - Notify supervisor. It is possible another troubleshooting work package applies.
TM 9-2320-272-23-1
0084
0084-6
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