Career
He later coached the Samoan national team During this time he gained selection for New Zealand on 21 occasions between 1985 and 1990. He was selected for the 1985 New Zealand Tour of Great Britain and Fance and would make his test debut playing on the wing in the third test against Great Britain at the Elland Road ground in Leeds which ended in a 6-all draw.
His final test appearance for New Zealand came on 19 August 1990 against the Australians in Wellington, with the Australians winning the game 24–6.
In the third test of the 1989 Transport-Tasman series against Australia in Auckland, Williams was on the receiving end of a famous hit from Australian skipper Wally Lewis. This tackle was later described by commentator Ray Warren as easily the biggest he"s ever seen.
Williams moved to Australia to play in the NSWRL premiership for the Manly-Warringah Sea Eagles at the start of the 1987 NSWRL season. He made his debut for the Sea Eagles in the wing in a 4-all draw with Street George in the opening round of the season.
He would go on to play in Manly"s Grand Final winning team that year, becoming the first Kiwi to play in an Australian grand final-winning team
Following the grand final victory he travelled with Manly to England for the 1987 World Club Challenge against their champions, Wigan. lieutenant would be the only time he would be on the winning side in 9 tests against the Australians. In the 1990s Williams was appointed a National Rugby League judiciary member.
He was later appointed coach of the Samoa national rugby league team for their 2000 World Cup campaign.
Samoa reached the quarter finals where they faced eventual champions Australia and were knocked out. Williams has also been a selector for the New Zealand national side.
This led to Storm coach Craig Bellamy and then-Chief Executive Officer Brian Waldron paying out $105,000 plus legal costs to Williams and the other judiciary panellists in late 2010.