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Test 6. Test negative cable 7 voltage drop from batteries to starter
Test 8. Test battery voltage after cranking load is applied

TM-9-2320-272-24-1 Truck 5-Ton 6x6 M939 M939A1 M939A2 Series Trucks (Diesel) Manual
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TM 9-2320-272-24-1
Table 2-3. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Test 7. Test positive cable 6 from batteries to starter solenoid.
Step 1.  Set multimeter to lo-volt range.
Step 2.  Connect multimeter positive lead to positive terminal point on batteries and negative
lead to positive terminal on starter solenoid.
Step 3.  Crank engine and observe multimeter. A voltage reading exceeding 0.4 volt indicates
loose or corroded connection.
Clean and tighten connections at batteries, starter, and chassis (para. 3-124).
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