TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. ENGINE CRANKS BUT FAILS TO START ABOVE 50° (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.
CAUTION
Do not crank engine for more than 20 seconds. Allow starter motor to cool for 2 minutes between
cranking attempts. Cranking too long can overheat and damage starter motor.
Step 20
Check automatic override module (1) for 11 to 13 vdc at START 2 terminal (2) as follows: Set
multimeter to 2 vdc scale. Connect red test lead to START 2 terminal (2) and black test lead to
ground. Have assistant rotate KEY SWITCH (3) clockwise to on position and press ENGINE
START button (4) for 1 second. Check for 11 to 13 vdc on multimeter. Have assistant rotate KEY
SWITCH (3) counterclockwise to off position. Disconnect test leads.
a
If multimeter reads no voltage, go to step 21.
b
If multimeter reads 11 to 13 vdc, go to step 22.
Step 21
Check 19 wires (5) from automatic override module (1) to ENGINE START button (4) for broken
condition as follows: Disconnect batteries (page 2-424). Set multimeter, to ohms scale and adjust
to 0 ohms. Connect red test lead to START 2 terminal (2) and black test lead to terminal stud (6).
Check for 0 ohms on multimeter. Disconnect test leads.
If multimeter reads no continuity, 19 wire (5) must be replaced. Notify Direct Support
Maintenance.
Step 22
Check automatic override module (1) for 11 to 13 vdc at LOAD 3 terminal (7) as follows: Set
multimeter to 20 vdc scale. Connect red test lead to LOAD 3 terminal (7) and black test lead to
ground. Have assistant rotate KEY SWITCH (3)
2-80
