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 194 of 1015

TM 9-2320-272-24-1

Table 2-3. Electrical Troubleshooting (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Test 6. Test negative cable 7 voltage drop from batteries to starter.

Step 1.

Set multimeter to lo-volt range.

Step 2.

Connect multimeter positive lead to terminal stud on end plate of starter and negative

lead to grounding point at batteries.

Step 3.

Crank engine and observe multimeter. A voltage reading exceeding 0.4 volt indicates

loose or corroded connection(s).

Clean and tighten connections at batteries, starter, and chassis (para. 3-124).

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