TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3.
ENGINE FAILS TO CRANK - 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 27.
Set multimeter to 20 vdc scale. Connect red test lead to input terminal (1) on KEY SWITCH (2) and
black test lead to ground. Check for 11 to 13 vdc on multimeter. Disconnect test leads.
a.
If multimeter does not read 11 to 13 vdc, go to step 29.
b.
If multimeter reads 11 to 13 vdc, replace KEY SWITCH (2) (page 2-740).
Step 28.
Disconnect batteries (page 2-424). Set multimeter to ohms scale and adjust to 0 ohms. Connect red
test lead to input terminal (1) on KEY SWITCH (2) and black test lead to output terminal (3) on
secondary magnetic switch (4). Check for 0 ohms on multimeter. Disconnect test leads.
a.
If multimeter reads no continuity, 15 wire (5) must be replaced.
Notify Direct Support Maintenance.
b.
If multimeter reads 0 ohms, go to step 29.
Step 29.
Check 15 wire (5), 14 wire (6), or 14B wire (7) at output terminal (3) on secondary magnetic switch (4)
for loose or corroded condition.
a.
If 15 wire (5), 14 wire (6), and 14B wire (7) are loose at output terminal (3), tighten
using 9/16-inch open-end wrench. Connect batteries (page 2-424).
b.
If 15 wire (5), 14 wire (6), or 14B wire (7) are corroded at output terminal (3), unscrew
and take off nut (8), 15 wire (5), 14 wire (6), and 14B wire (7) using 9/16-inch open-
end wrench. Clean terminals using wire brush.
2-102
