TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
53.
POWER TAKE OFF 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.
Pull lamp socket (1) out of power take off 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). Check for 11 to 13 vdc on multimeter. Disconnect test lead.
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 in-line fuse (5) from plastic fuse holder (6 and 7) as follows: push both ends of fuse
holder (6 and 7) together, turn counterclockwise and pull apart. Remove fuse (5). Using
multimeter, set ohms scale and adjust to 0 ohms. Connect red test lead to fuse end (8) and black
test lead to fuse end (9). Check for 0 ohms on multimeter. Disconnect test leads.
a. If multimeter reads no continuity, replace fuse (5).
b. If multimeter reads O ohms, install fuse (5) and go to step 4.
Step 3.
Check P.T.O. light switch (10) as follows: take out floor mat insert (11) and insulation (12). Using
number one cross-tip screwdriver, unscrew and take out two screws (13) and power take off
cover plate (14). Using multimeter set to 20 vdc scale, connect red test lead to terminal (15) 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, wire (16) must be replaced. Notify Direct
Support Maintenance.
b. If multimeter reads 11 to 13 vdc, go to step5.
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