TM 9-2320-363-20-1
Table 3-1. Troubleshooting (Cont)
Malfunction
Test or inspection
Corrective action
ELECTRICAL SYSTEM (CONT)
Tractor Beacon Light Circuits (Cont)
Step 4.
Remove tractor beacon light 15A fuse. Check for +12 VDC at lead 420JD
fuse connector from auxiliary light power bus.
If +12 VDC is present, go to step 5. If no voltage is present,
repair lead 420JD (page 3-2).
Step 5.
Disconnect lead 254 from beacon light switch. Check for +12 VDC at lead
254.
If +12 VDC is present, go to step 6. If no voltage is present,
repair lead 254 (page 3-2).
Step 6.
Disconnect lead 254 and lead 254A from switch. Activate switch. Check for
continuity between contacts of switch.
If continuity is indicated, go to step 7. If no continuity is
indicated, replace beacon light switch (page 4-186).
Step 7.
Disconnect lead 254A from tractor beacon light. Check for +12 VDC at
lead 254A.
If no voltage is present, repair lead 254A between beacon
lights and beacon light switch (page 3-2).
Power Take-Off (PTO) Circuits (All Except M915A2)
1. PTO DOES NOT ENGAGE.
Step 1.
Check reservoir heater/power take-off 15A fuse.
If defective, replace 15A fuse (page 4-204).
Step 2.
Check for +12 VDC at lead 18 from ignition switch terminal.
If +12 VDC is present, go to step 3. If no voltage is present,
repair lead 18 (page 3-2).
Step 3.
Disconnect lead 200D from PTO switch. Check for +12 VDC at lead 200D.
If +12 VDC is present, go to step 4. If no voltage is present,
repair lead 200D (page 3-2).
Step 4.
Disconnect lead 200E from PTO switch. Activate switch. Check for continuity
between contacts of PTO switch.
If continuity is indicated, go to step 5. If no continuity is
indicated, replace PTO switch (page 4-182).
Change 3 3-55
