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 749 of 1313
SOLENOID OPERATES, STARTER OPERATES, BUT ENGINE CRANKS SLOWLY - Continued
STEP
7.
IS NEGATIVE CABLE 7 VOLTAGE DROP NORMAL BETWEEN BATTERIES AND STARTER MOTOR?
a.
Connect multimeter red lead to terminal stud on end plate of starter motor. Refer to point to point
schematics.
T0700DAA
BLACK
RED
6
74
7
68-6
68
68
68-6
Figure 7.
Starter Motor Ground Voltage Drop Test.
b.
Connect multimeter black lead to grounding point at batteries.
c.
Assistant cranks engine.
d.
Meter reading should be less than or equal to 0.4 VDC while engine is cranked.
CONDITION/INDICATION
IS NEGATIVE CABLE 7 VOLTAGE DROP NORMAL BETWEEN BATTERIES AND STARTER MOTOR?
DECISION
NO - Repair, clean, and tighten all cable connections at batteries (Volume 2, WP
0350),
starter (Volume 2, WP
0303), and chassis. Go to Step (9) to verify problem is solved.
YES - Go to Step (8).
TM 9-2320-272-23-1
0087
0087-8
Back to Top
