Craig Kanada (70), Darren Griff (66), Andy Johnson (68) and Jason Schultz (65) shared third place at 9-under-par 201.
Heavy rain forced the tournament to be shortened to 54 holes after Thursday's action was cancelled.
Wisler extended his overnight lead of three to six after two birdies in his first four holes and mistakes by his closest competitors. The wind came up in the middle of his round and he bogeyed four holes to make it a tournament once again.
Short was on the range warming up for a potential playoff after a 5-under 65 on Sunday. Wisler knocked his second to six feet to set up birdie at 17 that put him two ahead. He bogeyed 18 when it didn't matter.
'Making birdie on 17 probably won me the golf tournament,' said Wisler. 'It gave me a bit of a cushion and I knew I didn't have to be perfect on 18. I went into today knowing they were chasing me and someone would have to put up a low score. Shorty was able to do that.'
The win was Wisler's second on the Canadian Tour while Short posted his highest finish on tour.
'I was close and I just started going for the stick on the last three holes' said Short, who had an eight-footer for birdie lip out on 17. 'I wanted to give myself a chance.'
Matt Hansen (68) and Chris Wollman (64) shared seventh at 8-under-par 202.