Table 2-9. Electrical System Troubleshooting (CONT).
TEST OR INSPECTION
3. ONE OR MORE DOME LIGHTS ARE INOPERABLE.
Ensure 24 VDC panel switch is in the ON position (TM 9-4940-568-10).
FRS MASTER DISCONNECT switch is in the ON position (TM 9-4940-568-10).
Ensure FRS 24 VDC electrical system is functioning properly.
Disconnect wire (1) from dome light (2) and check for voltage between wire plug end and a known good ground.
If voltage is present, remove lense cover and check condition of bulbs (Para 3-11). If bulbs
are faulty, replace bulbs. If bulbs are OK, go to next test.
Reconnect wire to dome light for the following action.
With bulbs removed and dome light selector switch on (3), check for voltage between dome light bulb socket and
a known good ground.
If voltage is present, ensure dome light is properly grounded. If voltage is not present,
replace dome light (Para 3-11).