Changing ballast in parallel fluorescent lights?

There are 4 sets of fluorescent light fixtures in a room. I believe they are wired parellel. The lights are old, and a ballast went out in one of them. It was the old kind of ballast where it has one red and one blue wire going to the bulbs. The new ballast has one common red wire for the bulbs and 2 separate blue wires for the bulbs. Redoing the wiring for the new ballast is fairly straightforward.



But the difficult part for me is how to do it parallel. There was a hot %26amp; neutral wire coming to the end of the old light fixture which then fed into the old ballast and also fed to the next set of light fixtures. I'm not sure how to rewire it.



In a nutshell, I've got a hot %26amp; neutral coming in. The black and white wire for the ballast, and a hot and neutral going out. I have the single red wire from the new ballast going to both ends of the 2 bulbs. Both blue wires are connected separetly to the other ends of the bulbs.



How do I connect the remaining 6 wires?Changing ballast in parallel fluorescent lights?
First check to make sure that the ballast that you purchased is appropriate for the bulbs that you will be putting back into the fixture. The old fixture required T-12 bulbs and it sounds like you have an electronic ballast intended for the newer T-8 bulbs.



Once you have the right ballast you will notice that it has a wiring diagram on the ballast. Following the diagram two wires will be intended to be connected to hot and neutral. It may be that the wire that is to be connected to hot and neutral will come from one end of the clips and not from the ball use. When you have the ballast wired into the fixture and you have isolated the two appropriate wires you will simply connect all the blacks together and all the whites together (assuming that all the color designations are consistent and correct.)



You may have to extend some wires within the fixture to do this.