"It was a pretty fresh wicket," said Wheeler who had no qualms about padding up as nightwatchman after CD lost two early wickets in their innings before stumps last night.
Black Caps seamer Tim Southee struck twice, removing stand-in captain Jamie How and Carl Cachopa for golden ducks.
"Howser and Chops got good balls first up so there wasn't much they could do about it," Wheeler said.
Opener Ben Smith (1 run) and Wheeler (3 not out) will resume this morning with the forecast for thundery rain at times.
"We had the same forecast for today but we had a few spits and the sun was out so I'm not sure if we can believe it," Wheeler said, adding CD were dead keen on carrying on today.
CD wicketkeeper Kruger van Wyk had a great day with the gloves, snaffling three edges off Trego's deliveries and one off Doug Bracewell.