What have I done wrong?

Sounds to me you have a HOT and Common reversed on one of the loops.  With both loops on, use your volt meter set to AC and measure from the center rail of block 1 to the center rail of block 2.  If you have 36 volts, that is your issue.  Swap the Hot and common on one of the 2 blocks.

Marty meant to say, center rail outer loop to center rail inner loop.

You also need to isolate the turnouts from one another by using a 1 3/8" section of track with the center rail wire pulled in between the two turnout tracks. That will keep the outer loop power separate from the inner loop power.

Run all of your siding off of the inner loop mains.

Do you have a track diagram that could be marked up for wiring connections?

Marty,

  As ever you are spot on. Now the only issue left is when the loco runs through the turnout from inner loop to outer loop it shorts in the middle of the turnout. Do I need to reverse the wires in the tmcc lockons on the outer loop so all are the same or is it another  issue?

   Phil 

Carl,

 I followed Marty's instructions and my meter showed 36 .  The loco ran fine after that. My problem know is that the loco shorts out on the turnout between inner and outer loop as it crosses the isolation piece that insulates one loop from the other.

    Phil 

Are the bricks accessible? Check the date code on the bottom. if you see a 2008 48, it is one of the bricks that have the hot and neutral reversed internally.

perhaps it's not you.

 bulletin attached

Nope, none of them have that number heat stamped in them.

   Thanks. 

here's a track diagram photo. Open it with MS Paint and draw in you wiring schematic.

This has each loop with 2-5" block tracks and a 1 3/8" between the switches to represent the isolation point.

squiggly lines are ok.

Then, you'll probably see where you went wrong on your own.

I do have one question...If you are using PH-180's and constant voltage for command operation, why are you using the lock-on building?

Opened your wiring diagram and it is giberish. All symbols and numbers. Thanks anyway. 

I checked the voltage across the turnouts and it registered between 36 and 37volts so that seems to indicate I need to reverse the leads for one the loops so they all work together. 

I use TMCC lockons because I don't use a transformer and they give me a very positive connection to the fastrack and the look cool.

    Phil 

I attached the wrong file-should have been a photo-here it is.

You can get molex connector and pins to connect to the brick lead and give you two wires for power connection. The PH has a wonderful breaker and should kick before the lock-on breaker does.

Your way works when you don't want to fool with building adapters.