TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. ENGINE CRANKS BUT FAILS TO START ABOVE 50°F (18°C) - CONTINUED
WARNING
Although KEY SWITCH must be on and battery ground cable connected to test electrical circuit
voltage, turn off KEY SWITCH and disconnect battery ground cable before doing resistance tests
or replacing parts. This will keep you from getting shocked and prevent damage to parts and
equipment.
Step 16
Check 19C wire (1) from fuse panel (2) to automatic override module (3) as follows: Disconnect
batteries (page 2-424). Pull wire connector (4) from fuse panel (2) and, using 11/32-inch box-end
wrench, unscrew and take off nut (5) and 19C wire (1) from POS 1 terminal (6). Set multimeter to
ohms scale and adjust to 0 ohms. Connect red test lead to wire terminal (7) and black test lead to
19C wire (1) in wire connector (4). Check for 0 ohms on multimeter. Disconnect test leads.
a.
If multimeter reads no continuity, 19C wire (1) must be replaced. Notify Direct Support
Maintenance.
b
If multimeter reads 0 ohms, put wire connector (4) on fuse panel (2) and put wire
terminal (7) and nut (5) on POS 1 terminal (6). Tighten using 11/32-inch box-end
wrench. Connect batteries (page 2-424) and go to step 17.
Step 17. Check automatic override module (3) for proper ground as follows: Set multimeter to 20 vdc
scale. Connect red test lead to GROUND 4 terminal (8) and black test lead to POS 1 terminal (6).
Have assistant rotate KEY SWITCH (9) clockwise to on position. Check for 11 to 13 vdc on
multimeter. Have assistant rotate KEY SWITCH (9) counterclockwise to off position. Disconnect
test leads.
a
If multimeter reads no voltage, go to step 18.
b
If multimeter reads 11 to 13 vdc, go to step 20.
Step 18 Check ground wire (10) on automatic override module (3) for proper ground as follows: Disconnect
batteries (page 2-424). Using 11132-inch box-end wrench, unscrew and take off nut (11) and
ground wire (10) from GROUND 4 terminal (8). Set multimeter to ohms scale and adjust to 0
ohms. Connect red test lead to wire terminal (12) and black test lead to ground post (13). Check
0' O ohms on multimeter. Disconnect test leads.
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