TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
48.
OIL PRESSURE/WATER TEMPERATURE 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.
Step 1.Open upper center instrument panel (page 2-424). Pull lamp socket (1) out of oil
pressure/water temperature 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 lamp socket (1). Rotate KEY SWITCH (5) clockwise to on position and check for 11 to 13
vdc on multimeter. Rotate KEY SWITCH (5) counterclockwise 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.Remove instrument panel pad (page 2-424). Using multimeter set to 20 vdc scale,
connect red test lead to output terminal (6) on engine warning bell (7) and black test lead to
ground. Rotate KEY SWITCH (5) clockwise to on position and check for 11 to 13 vdc on
multimeter. Rotate KEY SWITCH (5) counterclockwise to off position. Disconnect test leads.
a.If multimeter does not read 11 to 13 vdc, close upper instrument panel (page 2-424)
and go to, Malfunction 47, ENGINE WARNING BELL DOES NOT WORK (page 2-
294).
b.If multimeter reads 11 to 13 vdc, 19F wire (8) must be replaced. Notify Direct
Support Maintenance.
Step 3.Check lamp (3) as follows: Using multimeter, set to ohms scale and adjust to 0 ohms.
Connect red test lead to center contact (9) and black test lead to metal base (10). Check for 0
ohms on multimeter. Disconnect test leads.
a.If multimeter reads no continuity, replace lamp (3). Put lamp (3) into lamp socket
(1). Push in, turn clockwise and release. Push lamp socket (1) into oil
pressure/water temperature indicator (2). Close upper center instrument panel (page
2-424).
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