TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
49.
GLOW PLUG INDICATOR LAMP DOES NOT WORK.
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.
NOTE
Scrape all painted surfaces to bare metal before connecting test leads to ensure
correct multimeter readings.
Step 1.Open upper center instrument panel (page 2-424). Pull lamp socket (1) out of glow plug
indicator (2). Push in lamp (3), turn counterclockwise and pull out. Using multimeter set to 20 vdc
scale, connect red test lead to center contact (4) and black test lead to ground. Press GLOW
PLUG ONIOFF switch (5) to ON position and check for 11 to 13 vdc on multimeter. Press GLOW
PLUG ON/OFF switch (5) to OFF position. Disconnect test leads.
a.
If multimeter does not read 11 to 13 vdc, go to step 2.
b.
If multimeter reads 11 to 13 vdc, go to step 3.
Step 2.Using multimeter set to 20 vdc scale, connect red test lead to output terminal (6) on GLOW
PLUG ON/OFF switch (5) and black test lead to ground. Press GLOW ON/OFF switch (5) to ON
position and check for 11 to 13 vdc on multimeter. Press GLOW PLUG ON/OFF switch (5) to
OFF position. Disconnect test leads.
a.If multimeter does not read 11 to 13 vdc on multimeter, go to Malfunction 1,
ENGINE CRANKS BUT FAILS TO START BELOW 50°F (18°C) (page 2-47).
b.If multimeter reads 11 to 13 vdc, 18B wire (7) must be replaced. Notify Direct
Support Maintenance.
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