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 750 of 1313
SOLENOID OPERATES, STARTER OPERATES, BUT ENGINE CRANKS SLOWLY - Continued
STEP
8.
IS POSITIVE CABLE 6 VOLTAGE DROP NORMAL BETWEEN BATTERIES AND STARTER MOTOR?
a.
Connect multimeter red lead to positive terminal point on batteries. Refer to point to point schematics.
T0701DAA
BLACK
RED
6
74
7
68-6
68
68
68-6
Figure 8.
Starter Motor Cable Voltage Drop Test.
b.
Connect multimeter black lead to positive terminal on starter motor solenoid.
c.
Assistant cranks engine.
d.
Meter reading should be less than or equal to 0.4 VDC while engine is cranked.
CONDITION/INDICATION
IS POSITIVE CABLE 6 VOLTAGE DROP NORMAL BETWEEN BATTERIES AND STARTER MOTOR?
DECISION
NO - Repair, clean, and tighten all cable connections at batteries
(Volume 2, WP
0349) and
starter (Volume 2, WP
0303). Go to Step (9) to verify problem is solved.
YES - Replace starter motor and solenoid assembly (Volume 2, WP
0303). Go to Step (9) to verify problem is
solved.
TM 9-2320-272-23-1
0087
0087-9
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