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 778 of 1313

FIELD MAINTENANCE

NO ALTERNATOR OUTPUT (100 AMP ALTERNATOR)

INITIAL SETUP:

Tools and Special Tools

Tool Kit, General Mechanic's: Automotive

(Volume 5, WP

0826, Table 1, Item 56)

Multimeter

(Volume 5, WP

0826, Table 1, Item 34)

Test Set, Electronic Systems

(Volume 5, WP

0826, Table 1, Item 51)

Personnel Required

(2)

References

Point to Point Schematics

References (cont.)

Volume 2, WP

0296

Volume 2, WP

0297

Volume 2, WP

0302

Volume 3, WP

0352

Volume 5, WP

0780

Volume 5, WP

0792

Equipment Condition

Vehicle parked and engine shut down.

(TM

9-2320-272-10)

TROUBLESHOOTING PROCEDURE

NO ALTERNATOR OUTPUT (100 AMP ALTERNATOR)

NOTE

Conduct these malfunction tests if there is no output from the alternator. This procedure will

check the alternator belts, alternator, starter, and voltage regulator harness.

TM 9-2320-272-23-1

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0090-1