Thanks for the help so far. I have had many questions answered by sifting through posts.
I have two Intermatic 104 timers. One for the filter pump, one for the polaris booster. I want the pool to run 8am-8pm and the polaris to run 11am-1pm. I have line1 going to screw 1 on the filter pump timer, then going to screw 1 on the booster pump timer. Line2 going to screw 3 on the filter timer, then running to screw 3 on the booster pump timer. Screws 2 and 4 go to the filter and booster pump. Both timers are relatively new and seem to be keeping time correctly. The booster timer kept the correct time for a few weeks, then all of a sudden did not and burned out the seals on the booster pump. Is this wired correctly? Is there a way to prevent the booster pump from coming on when the filter pump is not on? Thanks for the thoughts