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 NG
Parking Brake Indicator
1. Remove the Y/DK BL wire from the 9G8009 Parking Brake Pressure
Switch. Use an 8S4627 Circuit Tester to check for continuity across the switch.
There must be continuity with the parking brake not engaged.
Continuity
No Continuity
The switch is good. Go to Step 2.
Replace the switch.
2. Check continuity from the switch to machine ground with an 8S4627 Circuit
Tester.
Continuity
No Continuity
The ground connection is good. Go to Step 3.
Repair or replace the harness or fasten a ground wire
from the switch to machine ground.
3. Connect the Y/DK BL wire to the switch again. Disconnect the harness plug
from the operator panel. Check for continuity between Sockets 2 and 19 in the
harness plug with an 8S4627 Circuit Tester. Socket 2 is the ground connection
for the operator panel and Socket 19 goes to the parking brake pressure switch.
Continuity
No Continuity
The harness is good. Replace the operator panel.
Use the electrical schematic or simplified schematic
to find the harness with an open wire. Repair or
replace the harness.
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