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TRAILER CONNECTION SYSTEM - TM-9-2320-272-24-10184
ENGINE AND VEHICLE ELECTRlCAL SYSTEM MALFUNCTlONlNG

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.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ENGINE AND VEHICLE ELECTRICAL SYSTEM
1. ENGINE AND VEHICLE ELECTRlCAL SYSTEM MALFUNCTlONlNG
Test 1. Check alternator output.
Step 1.  Remove two screws (2), lockwashers (3), and terminal cover (1) from alternator (4).
Step 2.  Connect black test lead to ground and red test lead to lead 5.
Step 3.  Check alternator output (malfunction 9). Multimeter should indicate 26.5-29.5 volts.
Step 4.  If voltage is within range, go to step 6.
Step 5.  If voltage is not within range, adjust alternator (4). Perform malfunction 14.
Step 6.  Install terminal cover (1) on alternator (4) with two lockwashers (3) and screws (2).
Test 2. Check vehicle ground straps.
a. Ensure ground straps are securely fastened and no paint is under starwasher.
b. Remove paint as necessary.
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