I have an old 3 door cooler. The lights have recently gone out and I think the ballasts are the cause. I ordered replacement ballasts from the same company the old ballasts were from. The old Ballasts have one black, one white, and one blue wire. The new Ballasts have the same, but also a red wire. Not sure what to do with the red. The cooler has 2 lights with a switch on each light. There are also starters for each light. Yellow wires go to the switch and the starters, but not to the ballasts. Just wondering if anyone can help me determine where the red wire would hook into. Thank you!