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 188 of 1015

TM 9-2320-272-24-1

Table 2-3. Electrical Troubleshooting (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

NOTE

If STE/ICE is available, perform NG81 - Battery Tests

(para. 2-24).

Test 3. Check protective control box continuity from pin C to pin D.

Step 1.

Place battery switch to OFF position.

Step 2.

Disconnect harness connector from protective control box.

Step 3.

Set multimeter to RX1 for continuity reading.

Step 4.

Apply battery voltage to pin A of control box.

Step 5.

Touch negative multimeter lead to pin C and positive lead to pin D on control box.

a. Continuity should be indicated between pins C and D.

b.

If continuity is not indicated, replace protective control box (para. 3-115).

END OF TESTING!

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