Hi Heinrichhess, please don't try this. The solenoids and bulbs in the M track turnouts are designed for the ~16VAC power from the L outputs from the power supplies. The 3rd rail power is variable from ~4-17VAC, and momentary ~27VAC.

If you connect the yellow to the 3rd rail, the bulb will only glow when track power is supplied, and the bulb will likely burnout when reversing (27VAC) power is applied. The turnout solenoids will only operate when ~16VAC power is applied to the track power; that's almost full power/highest speed. They may buzz at lower power but depending on their condition and the draw from loks on the same track they may just buzz until they burn out; they'll also burn out if their control button is held down to force the turnout to switch.

You can connect the yellows together and then run a single yellow back to the power supply if you use the 7209 distribution strip to minimize the yellow runs back to the power supply.

Hope this helps.

Brian

Hello Hess,
Even with constant power with digital, it is best to follow the Marklin wiring guidelines. You want the constant power to be as "constant" as possible without any unexpected power drainage and perhaps affect your decoders negatively. Avoiding any potential disasters, the idea of using a few distribution buses to reduce wiring is the best imho. If you want to use a larger gauge wire from the bus to the power supply, that might improve potential issues with too many wires to one location, but if its only a same amount of wires as are plug inlets on the standard Marklin wiring bus, then it should be fine.

Good luck,
Mark

Yes, that should work as long as you are using the older AC signals and you keep the two power systems and returns independent from one another. I have not done this myself so perhaps someone with more experience doing so should weigh in.

Great Hess,
Try a few tests with it and with isolated systems and correct resistors for LEDs I think it should be fine.
Let us know your progress.

Thank you hxmiesa,
You have raised a question I have always asked myself. I used a blue trafo on my old layout only for the interior house lights and to adjust to keep them dimmer; so as not to burn them out, and the old incandescent lights were bright.

However, I also thought it best to have their return to the same trafo. Would it have been possible to have "ground wires" aka brown return wires to the same brown bus? Now that I am thinking about it, its been a few years and wondering if I did that or not.

I am not sure I understand circuits well enough if returns/browns can be blended. Is it the case that once the power is consumed within the resistance of the device/switch/light/signal/train that the return is irrelevant? Does the blue trafo not have to also have a return brown wire, as would the other "digital" constant power source?

I hope this question does not complicate things too much. Your question about the contact tracks is very important, so having that work seems essential.

Thanks again
Mark

I just connect all brown wires together.
I use around 15 different AC trafos (Titan, Märklin), a 24Vdc (250W) trafo and an MS2. Their BROWN/0 are all connected with one big fat wire.
You could differentiate the browns if you think that helps make things clearer, but I think it is just more wiring. -And what happens if you mistakenly connect the power from one trafo the the brown of another? -Just ground the whole thing!!!

The only thing I should probably stress, is to use only the brown TRACK-wire form the MS2, NOT the one from it´s power supply!

thanks hxmiesa good advice on not grounding old analogue controller

hess

i will run all switches of old controller and 3rd rail power of MS2 and only ground switches and 3rd rail to MS2

hess

thanks BenP sounds like i would be best having 12v dc powered supply for buildings light on a separate circuit



hess