Fleetwood went eight points clear at the top of the Blue Square Bet Premier table with victory at Kidderminster.
The hosts dominated the first half and missed a host of chances with the best of them falling to Marvin Johnson, who skewed wide from six yards.
Andy Mangan put the Cod Army ahead after the break with an 18-yard drive.
Richard Brodie then saw his close-range effort rom Alan Goodall's corner deflected into the Harriers' net by Lee Vaughan to kill off the game.
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Kidderminster assistant manager Gary Whild told BBC Hereford and Worcester:
"It is frustrating because there has been a similar pattern over the last three or four games.
"It is very frustrating for the players, but on the upside, we have said to the players there are 10 games left.
"That is obviously a lot of points - 30 points left to play for and we have got to make sure we don't tail off.
"It is important that we make a good fist of it between now and the end of the season."