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
4. Turn disconnect switch “OFF”. With the harness plug removed from the
operator’s panel, make a replacement of the fuse. Turn the disconnect switch
back “ON” and note the condition of the fuse. Then plug the harness into the
operator’s panel.
If Fuse Burns Out Before Harness is Plugged In
If Fuse Burns Out After Harness is Plugged In
Shorted wire in harness. Repair or replace.
I
Replace operator’s panel.
5. Check the ground connection to the operator panel (Socket 2) with a 5P7277
Voltage Tester. Check for voltage between Socket 1 and 2 in the harness plug
that connects to the operator panel. The ground must be good for the voltage
tester to show voltage.
If Ground Connection Is Good
If Ground Connection Is Not Good
Replace the operator panel.
Use the simplified schematic for power to the opera-
tor panel to find the reason for no ground.
PROBLEM B: Only the Indicators Are ON That Are Normally ON With
the Engine OFF.
Possible Causes: a. Bad test switch.
b. Bad harness between the test switch and the operator
panel.
c. Bad operator panel.
TROUBLESHOOTING
1. Disconnect the harness plug from the operator panel. Make sure the test
switch is in the TEST position. With an 8S4627 Circuit Tester, check for
continuity through the test switch to ground, at Socket 2 and 15 in the harness
plug. Socket 2 is the ground for the operator panel and Socket 15 goes to the test
switch.
Continuity
No Continuity
Replace the operator panel.
Go to Step 2.
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