I haven't used that combiner, but as near as I can tell the switch should be off if a preamp is used after the combiner. If you made a test with the switch on with no preamp but the power inserter on and powered, there is a chance that you have damaged the combiner or inserter or both.
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What I meant on the coaxial cables crossing over is going into the house the same cable crosses it self in places.
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I still don't understand; I would need to see a diagram of what is connected to what.