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Last night i am running my trains when i notice the light in the engine flickering - and a little sputtering.  It travels another 15 feet or so then just dies.   I am wondering if it the battery?

Come to realize it is not the engine at all - the entire layout does not have power.   That is, not the entire layout, but everything wired from terminal block 1 and the one throttle on my z4000.   Completely dead.  No lighted cars no engine no nothing as if it was completely off.  Other throttle and terminal block are working fine.

pertinent facts.

1.  there is no short as volts are steady at 18-19

2.  Tested another transformer in lieu of z4000 left throttle - nothing.

3.  All wires tight transformer - AIU - Terminal block

4.  Been running this layout for 10 years....nothing like this ever before.

5. Decide to run new wires from terminal block to track just as a starting point..      I connect 1 red wire from terminal block to center rail of arbitrary track.   (the closest) and everything turns on as if nothing has happened.   I have several toggle and blocks on the layout.   Adding that one wire makes it all work just fine.  

So the easier answer appears just keep that one extra red wire there.   That gets me running.  

However, something happened.  I can start diagnosing certain wiring etc.  But admittedly, my wires system is spaghetti -  it would take forever.  I can't imagine why all of the sudden this one wire gives the layout power.

thoughts?

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Well, it sounds like your targets for investigation are fairly straightforward. You've already established the transformer itself is working, (I'm assuming your "volts are steady" conclusion was measured at or near the transformer) and that something between the transformer and the track is not. The "red wire" is an obvious bypass of the break, so all you have to do is remove the bypass, power up the transformer, and work outward from the transformer to the track, testing at each junction for power. When the power disappears, just work backward in the last section to find the fault. Or am I missing something?

it is as if power is  getting to the terminal block...i.e .wires from TIU to terminal block but not leaving the terminal block and getting to the track.   There 15-20 (however many) leaving the terminal block going to various points  on the layout with insulated blocks throughout the layout -all of them are dead.   Wires are still soldered to the track and still tight to the terminal block.   However, One wire from the terminal block input to one center rail bypasses all the other individual terminal block ports of the track which by the way, many are separated by insulated pins.   It does not make sense.  

Again, the wire to tiu is tight wire to terminal block is tight wire to track is tight.....they didn't all of the sudden come lose from the track and or terminal block....not one but 15.  Nothing has changed it was running then it was not ....nothing came loose.

Well as it is most of the time....reboot.   Obviously the hot wire in from transformer must have been loose despite "looking" tight or the nut in the back or both.  I took off the terminal block from the 2x4 it was mounted to didn't really see anything significant  made sure both sides were tight and put it back - Viola....it worked,  

Thanks to everyone....

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