FILM GP 1281853 - Caterpillar

electrical problems are often caused by poor connections. Use the following checks as a reference for inspecting connectors.
Check each pin and each socket.
Use a new pin and a new socket in order to check each contact of the connector for a snug fit. The new contact should stay connected if the connector is held with the contacts that are facing down.
Use needle nose pliers to close the sockets of the J2 connector that plugs into the ECM in order to ensure a good connection.
Check the connection of the connectors.
Ensure that the locking rings are properly locked.
Ensure that locking clips are used on Sure Seal connectors.
Ensure that the center of the connector is tight.
Ensure that the connector pins and sockets align properly.
Ensure that the connector body is not damaged.
Ensure that all of the pins or sockets are properly seated in the connector.
Inspect the locking tabs that are inside the connector and ensure that the seal is good.
Check the wires at the connector.
Ensure that the wires enter the back of the connector straight.
Ensure that each wire is properly crimped into the proper connector contact.
Ensure that each connector contact is properly locked into the connector contact. When the connector contact is locked properly, the contact (wire) cannot be pulled out of the connector body without excessive force.
Check each wire for nicks or signs of abrasion in the insulation.
Check for moisture at the connector.
Check for damaged connector seals or lost connector seals.
Check for missing or loose wire hole plugs.
Check for wires that do not enter the connector properly.
If the wires enter the connector at an angle, there may not be a good seal between the connector and the wire insulation.
Moisture can enter the connector through the wire insulation.
Check for dirty contacts or corroded contacts.
Clean contacts with a cotton swab or a soft brush and denatured alcohol only.