TM 10-3930-641-20
ELECTRICAL SYSTEMS TROUBLESHOOTING (CONT)
(Sheet 1 of 1)
PROBLEM NO. 11
ONE WILL NOT COME ON WHEN PANEL TEST SWITCH IS ON
INDICATOR LIGHTS
ANSWER
YES
NO
STEP
REMARKS
QUESTION OR INSTRUCTION
*
*Replace bulb (24 volt only ).
1
2
*
3
2
Check condition of socket and if bulb is seating correctly. Is
socket good?
*
4
*Make proper.
3
Gain access to rear of instrument panel. Are the wire terminals
properly connected and tight? (NOTE A).
6
5
4
Test individual diode for light which will not come on. Is
diode good?
Individual diodes are not serviceable, replace diode board
5
assembly.
--
--
6
18 gage W wire from diode to lamp socket is open, repair or
replace wire.
*For LOW PRESS BRAKE indicator, test flasher for continuity, see page 2-53. Replace flasher if defective.
End