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
PROBLEM B: An Indicator That Must Be ON is NOT ON.
Possible Causes: a. Switch is bad.
b. Wire, in the harness, that goes to the switches, is grounded or
shorted to another wire in the harness that is at ground
potential.
c. Operator panel is bad.
1. Remove the power wire (not the B wire) from any switch (sensor) and the
indicator must turn ON. If the indicator was NOT ON at first but was one that
must be ON, and when the wire was removed from the switch it:
Did Turn ON
Did Not Turn ON
The switch is bad. Replace the switch.
The harness has a short or the operator panel is bad.
Go to Step 2.
2. Put tape on the end of the wire that was removed from the switch so that it can
not be grounded to the machine.
Disconnect the harness plug from the operator panel. Use an 8S4627 Circuit
Tester to check for continuity between the battery (-) [Socket (2)] and the
connection for the switch, in the harness plug. The socket for the different
switches is shown in TABLE 2.
I
TABLE 2
I
Connection
Indicator
5
Engine 011 Pressure
8
Low Brake Alr Pressure
9
Parking Brake
12
Coolant Flow
Continuity
No Continuity
There is a ground or short in the harness. Repair or
Replace the operator panel.
replace the harness.
.
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