How to Probe Connectors

How to Probe Connectors
Connector damage and an intermittent connection can result from improperly probing of the connector during circuit checks. The probe of a digital multimeter (DMM) may not correctly fit the connector cavity. To correctly probe the connector follow the procedures below using a "T" pin. For the best contact grasp the "T" pin using an alligator clip.






PROBING FROM HARNESS SIDE
Standard type (not waterproof type) connector should be probed from harness side with "T" pin.
- If the connector has a rear cover such as an ECM connector; remove the rear cover before probing the terminal.
- Do not probe waterproof connector from harness side. Damage to the seal between wire and connector may result.


PROBING FROM TERMINAL SIDE







Female Terminal
There is a small notch above each female terminal. Probe each terminal with the "T" pin through the notch.
Do not insert any object other than the same type male terminal into female terminal.






Some connectors do not have a notch above each terminal. To probe each terminal remove the connector retainer to make contact space for probing.






Male Terminal
Carefully probe the contact surface of each terminal using a "T" pin.
Do not bend terminal.