Re-connect the wires by following the manual with your particular ballast. Be sure you've connected the color-coded wires to the proper terminals and to the power connection. Check it again. You really want to get this right the first time. If the wires clip right in, then this should be easy. For older models, you may have to do some basic wiring. To do so:
Cut wires to appropriate length
Strip 1/4" of sheathing from the wires.
Group the matching wires from ballast to light according to your ballast's manual
Feed both ends of matching wire (one from the ballast, one from the light) into the wire nut.
Twist the nut clockwise to combine the wires.[5]