ROD ASSEM. 3G4761 - Caterpillar

open is a failure of an electrical circuit that results in no flow of electrical current. An open circuit is caused by failed electrical wires or a poor connection of electrical connectors. If an electrical wire or a connection is broken, the flow of electrical current through the circuit is interrupted. A normally closed circuit will have less than 5 Ω of resistance. The following procedure explains the test for an open circuit:Note: The diagram above is a simplified schematic of the Implement ECM and the Solenoids connections. The schematic is electrically correct. However, not all the possible harness connectors are shown. Refer to the latest version of (D8R and D8T) Electrical Schematic, UENR7441 for the complete schematic.
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, measure the resistance from the contact of the suspect wire to frame ground.Expected Result: The resistance is less than 5 Ω.YES - The resistance is less than 5 Ω. The harness circuit is correct.Stop.NO - The resistance is greater than 5 K Ω. There is an open in the machine harness.Repair: Repair the machine harness or replace the machine harness.Stop.