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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Wiring Systems And Power Management - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Probing Electrical Connectors >> Back probe

Back probe

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:
    • DO NOT back probe sealed connectors. Only back probe non-sealed connectors.
    • Only use the back - pinning probe set CH-51450-LEAD to back probe 0.64 terminals or larger. Do not back probe 0.50 terminals.
    • Only back probe connector terminals when specifically instructed in diagnostic procedures.
    • After back probing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact.
  1. Disconnect the electrical connector that will be back probed. This allows increased maneuverability of the connector when inserting the back probe test lead and will help reduce the opportunity for damage.
  2. Insert the back probe test lead into the back of the terminal, between the terminal and connector body.
  3. Measure the resistance between the back probe test lead and the corresponding terminal on the front of the connector to ensure a good connection was made. If excessive resistance is found, reposition the back probe test lead to ensure good contact between the back probe test lead and the terminal.
  4. Connect the electrical connector with the back probe test lead installed and continue diagnosis.
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