I think everyone is confused about my original post. So, let I try to be detail. I am upgrading to a bigger tank. So, I plan to run 6 T5 lamps using 2 x 660 IC ballasts. Each ballast will run 3 lamps. I finished wiring the 3 lamps but I have not done so for the other 3 lamps yet. So, I figured I tested first to see if the wiring was correct and yes it did. Because the light went on fine. So, I want to see if the other ballasts (3) good or bad. I unplugged the wire harness and plugged into the other ballasts (3). This time the light went on for a sec then it's off. So I use back and tested the first ballast the light went on fine again. So, my question is what is going on here? What should I do? Are there any different between the old model and new model?