TM 5-1940-322-24
0007 00
ELECTRICAL SYSTEMS TROUBLESHOOTING (Contd)
Table 1. Electrical Troubleshooting Procedures (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Check engine circuit switch.
1. Turn switch to ON position.
2. ONE OR BOTH
WARNING LIGHTS
2. Test switch, if switch is defective
DO NOT COME ON
replace.
(MASTER SWITCH ON)
2. Inspect engine circuit fuse.
If defective, replace fuse.
3. Test battery for load.
If defective replace battery
(TM 9-6140-200-14).
4. Check battery connections and
1. Clean battery posts and cable
cables.
connector leads.
2. Tighten cable leads.
3. Replace defective cables
1. Inspect individual lamps.
Replace defective lamps. Refer to
3. INDIVIDUAL LIGHTS
INOPERATIVE
lamp, and navigational lamps.
2. Check lamp sockets for corrosion.
1. Remove corrosion from lamp
sockets.
2. If corrosion is not present, check
spring action of lamp socket
terminals. If terminal springs are
defective, replace (WP 0057 00).
3. Test circuit fuse on control panel.
If fuse is defective, replace
4. Test switch on control panel.
If switch is defective, replace
1. Test individual sending unit.
If sending unit is defective, replace.
4. INSTRUMENT
Refer to WP 0094 00 for water
PANEL GAUGE
2. Test for continuity & voltage
temperature sending unit and
INOPERATIVE
present at gauge.
(WATER TEMPERATURE
unit.
AND OIL PRESSURE)
3. Check individual gauge for
If gauge is damaged, replace
damage.
Check operation of water temperature
5. WATER
sending unit.
TEMPERATURE
GAUGE
1. Verify voltage is present.
If voltage is not present inspect cable
INOPERATIVE
and cable connection for damage,
replace cable if damaged.
2. Verify water temperature sending
If water temperature sending unit is
unit is operating properly.
not operating properly, replace
