CLAMP 0020485 - Caterpillar

Measure the resistance between the contacts that are listed in Table 10.
Table 10
6-Pin Socket Connector (Mast End)    6-Pin Socket Connector (LR End)    Resistance    
A    A    Less than 5 ohms    
F    F    Less than 5 ohms    
C     C     Less than 5 ohms    
D     D     Less than 5 ohms    Expected Result:All of the resistance measurements are less than 5 ohm.Results:
OK - All of the resistance measurements are less than 5 ohm.Repair: The Laser Receiver or the Single Adapter has failed. Use a good laser Receiver and Single Adapter to verify which of the two components have failed.STOP
NOT OK - All of the resistance measurements are greater than 5000 ohms.Repair: The coil cable has failed. Replace the coil cable. STOPTest Step 15. CHECK THE VOLTAGE AT THE ELECTRIC MAST
Disconnect the cable at the base of the electric mast.
Turn the Disconnect Switch and the disconnect switch to the "ON" Position.
Turn the key start switch and the disconnect switch to the "ON" Position.
Move the "Power/Setup" switch on the display to the "ON" position.
Disconnect harness connector (6) from electronic control (3) .
Illustration 24 g01189993
10-Pin Connector
Check for machine voltage between the following contacts on the 10-pin connector for the electric mast listed in Table 11.
Table 11
10-Pin Connector Contacts    10-Pin Connector Contacts    Voltage    
A         Approximately machine voltage    
H     F     Approximately machine voltage    Expected Result:The voltage is approximately machine voltage.Results:
YES - The voltage is approximately machine voltage. Proceed to Test Step 18.
NO - The voltage is not machine voltage. Proceed to Test Step 16.Test Step 16. CHECK FOR VOLTAGE AT THE KNUCKLE CONNECTORS
Disconnect the coil cable from the knuckle connector.
Illustration 25 g01189993
10-Pin Connector
Check for machine voltage at the contacts for the knuckle connector that are listed in Table 12.
Table 12
10-Pin Connector Contacts    10-Pin Connector Contacts    Voltage    
A     F     Approximately machine voltage    
H     F     Approximately machine voltage    Expected Result:The voltage is approximately machine voltage.Results:
YES - The voltage is approximately machine voltage. The coil cable has failed.Repair: Replace the coiled cable.STOP
NO - The voltage is not machine voltage. Proceed to Test Step 17.Test Step 17. CHECK FOR VOLTAGE AT THE POWER MODULE
Disconnect the coil cable from the power supply module.
Turn the key start switch to the "ON" position.
Check for machine voltage at the connector contacts that are listed in Table 13.
Table 13
Power Module Contact    Power Module Contact    Voltage    
B     F     Approximately machine voltage    
D     F     Approximately machine voltage    
H     F     Approximately machine voltage    Expected Result:The voltage is approximately machine voltage.Results:
YES - The voltage is approximately machine voltage. The AccuGrade Harness has failed.Repair: Replace the AccuGrade Harness or repair the AccuGrade Harness.STOP
NO - The voltage is not machine voltage.Repair: Replace the power supply module.STOPTest Step 18. CHECK THE CAN DATA LINK
The key start switch and the disconnect switch remain in the OFF position.
Measure the resistance across