New Zealand halfback Jimmy Cowan has been convicted on two alcohol-related charges of disorderly behaviour while All Blacks teammate Piri Weepu avoided conviction on an unrelated charge.

Cowan, 26, was convicted and discharged on one charge and fined $NZ300 ($A252) on the other after his lawyer argued he had turned to alcohol to deal with "raging" personal issues.

The 15-Test All Black faces a third disorderly behaviour charge for which no trial date has been set.

Cowan was alleged to have jumped on a parked car in one incident and confronted security staff outside a nightclub in another in the South Island cities of Dunedin and Invercargill. The third charge relates to another incident in Dunedin.

Weepu avoided conviction on a disorderly behaviour charge relating to an incident in Wellington on September 6. He was granted police diversion, a system which allows first-time offenders to avoid conviction in exchange for pleading guilty and agreeing to perform community work.

Weepu was arrested in central Wellington after banging on a store window while trying to attract the attention of a friend. His lawyer said the incident was "very minor".

Brought to you by AAP © 2024 AAP