TM-9-2320-272-24-1

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4

JUNE 1998

TM-9-2320-272-24-1 - Page 227 of 1015

TM 9-2320-272-24-1

Table 2-3. Electrical Troubleshooting (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Test 2. Test flasher harness continuity.

Step 1.

Set multimeter to RX1 for continuity reading, and connect positive lead to terminal A of

flasher unit. Connect negative lead to terminal H of control unit cable, and observe

multimeter for continuity.

Step 2.

Connect multimeter negative lead to terminal F of control unit socket and positive lead

to terminal B of flasher unit. Observe multimeter for continuity.

Step 3.

Connect multimeter positive lead to terminal C of flasher unit connector. Connect

negative lead to ground, and observe multimeter for continuity.

a.

If any lead does not have continuity, repair (para. 3-131).

b.

If all leads have continuity and turn signals still do not work, replace flasher

(para. 3- 114).

c.

If turn signals still do not work, perform malfunction 25.

END OF TESTING!

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