I recently converted my single fan to a dual fan set up. To install the dual fans i cut the single fan plug off and wired the single wire from the harness to the two fans. I wired the red/black wire from the harness to the two red/black wires of the fans and the black wire from the harness to the two black wires of the fans. Did I do something wrong here? The fans only kick on when the a/c is turned on.