TM 5-3805-258-24-1
9 5 0 B O P E R A T O R ’ S S T A T I O N
E L E C T R I C A L T R O U B L E S H O O T I N G
2. Disconnect the B/W wire from the terminal of the test switch. Check for
continuity across terminals of the test switch. Use an 8S4627 Circuit Tester and
hold the switch in the TEST position.
Continuity
No Continuity
Go to Step 3.
Replace the test switch.
3. Check for continuity from the wire still connected to the Test switch to
machine ground.
Continuity
No Continuity
Repair or replace the harness.
Repair or replace the harness or connect a wire from
the terminal of the test switch to machine ground.
PROBLEM C: ALL Indicators Are ON; Master Fault Light is OFF.
Possible Causes: a. The light bulb is bad.
b. The harness to the master fault light is bad.
c. The operator panel is bad.
TROUBLESHOOTING
1. Remove the red lens and the master fault light bulb. With a 5P7277 Voltage
Tester, check the master fault light receptacle for voltage (All switches still in
TEST I position).
Voltage
No Voltage
Make a replacement of the bulb.
2. Remove the Y/LT BL wire
receptacle. Check the wires for
switch in TEST position).
Voltage
Go to Step 2.
and the B wire from the master fault light
voltage with a 5P7277 Voltage Tester (Test
No Voltage
Replace the light bulb receptacle and make sure
Go to Step 3.
wires are connected tightly.
3. Check for voltage between the Y/LT BL wire and machine ground with the
5P7277 Voltage Tester. (Test Switch in TEST position.)
Voltage
No Voltage
Ground wire is broken. Repair or replace harness or
Go to Step 4.
make a ground from receptacle connection to ma-
chine.
4-105
