COVER 9K5643 - Caterpillar

Test for an Open Circuit
Identify the connectors and the wire numbers of the suspect circuits. Use the Electrical System Schematic of the machine to identify the circuits.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the component and the ECM from the wiring harness.
At one of the disconnected harness connections, place a jumper wire from the contact of the suspect wire to frame ground.
At the other connector of the machine harness, use the multimeter probes to measure the resistance from the suspect wire contact to frame ground. Expected Result: The resistance is less than 5 ohms. OK - The resistance is less than 5 ohms. The harness circuit is correct.STOPNOT OK - The resistance is greater than 5000 ohms. There is an open in the machine harness.Repair: Repair or replace the machine harness.STOP.