Contact Resistance and Oxidation [HA6]

Contact Resistance And Oxidation





Resistance in contacts, leads and connections should be 0 Ohms; but there is sometimes some resistance in connections due to oxidation.

If resistance gets too large, it will cause problems. How large resistance can become without causing problems depends on how large the loads are in the circuit. A guideline would be a few ohms.

Checks:
- Check connections visually as per HA1. Check Connections Visually [HA1]





Cleaning female contacts and male pins

NOTE: Do not use rust-removal spray or grease on any HO2S connectors.

- Ignition off.
- Disconnect battery negative terminal.
- Blow disconnected connector clean with compressed air.
- Spray connector with anti-rust spray 116 1422 (116 1435 USNCDN).
- Blow clean with compressed air.





Greasing female contacts

NOTE: Do not fill sleeves with grease.





- Press grease 116 1417 in female contacts straight from tube.
- Check that space is filled in all contact sleeves.
- Using a spare male pin, check that female pin is making good contact and that pin stays on when male pin is given a slight tug.