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Reply to "New Layout Powerblocks not isolating"

The photo attached shows the power connections (blue) from each terminal of an MTH Terminal Block. It also shows the center rail insulators (red).  My thought was that the voltage would travel all the way from power connection (point 13) up through the 2 switches.  I don't have voltage all the way through the top switch.  Voltage and continuity end at the snake looking piece to the center insulator on the entering side of the switch coming down.  I would have thought the center would be jumped all the way through on the straight.   Also, I cant figure out why I need to insulate the common outside rails going into the bottom half circle between power points 14 & 16.  They are fed by MTH terminal block #2.  The power for the track outside of that is coming from MTH Terminal block #1  Each MTH terminal block is separately fed by the 2 variable outputs of the Z-4000.    I thought common mean't just that?  Any insifght or help would be appreciated.

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