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 810 of 1313

FIELD MAINTENANCE

BLACKOUT DRIVE OR BLACKOUT MARKER LIGHT INOPERATIVE

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

0315

Volume 2, WP

0326

Volume 2, WP

0327

Volume 3, WP

0352

Equipment Condition

Vehicle parked and engine shut down.

(TM

9-2320-272-10)

TROUBLESHOOTING PROCEDURE

BLACKOUT DRIVE OR BLACKOUT MARKER LIGHT INOPERATIVE

NOTE

Conduct these malfunction tests if blackout drive or blackout marker light is inoperative. This

procedure will check for defective bulbs, defective wiring harness or connector, corroded

parts, or defective switch.

TM 9-2320-272-23-1

0094

0094-1