How do you wire a shinaoraha curve switch for dcc?
Depends.
If it is a code 83 marketed by Walthers there are two versions. The earlier one is "power-routing" meaning the frog is fabricated with no insulating gaps and the point rails determine the polarity at the frog.
These need to have a gap or insulated joint on one or both of the rails coming off the frog.
A later "DCC Friendly" version is "all-live" variety and can be installed without the need for additional gaps but it would be advantageous to have power feeding the very long frog that a curved turnout usually has.
Look at the throw bar between the points. If there is plastic showing it is the DCC friendly type. If it is a solid strip of soldered nickel silver (top in photo) it is the earlier power routing type.
IMG_8651_fix by Edmund, on Flickr
Scroll to about the middle of this page and see the section on power routing.
Good Luck, Ed
The point end of the switch is connected to the track for power. The exit end of the switch ( both tracks ) is isolated from the rails. The points will change the polarity of the frog.
Please take a picture of the turnout (switch) you are using, and I (or someone else if they beat me to it) will sketch a wiring diagram for you.
-Kevin
Living the dream.