I get most of my LED’s from Handsignalman LED’s on eBay and he also does these LED holders for 3mm LED’s. I’m using an LED to indicate when the track is in ‘programming mode’.
4pdt switch and programming track wiring
I’ve done this wiring diagram, as much for my own sake as anyone elses, to try and make the operation clearer. So, when the switch is in one position it supplies normal DCC power feed to all the sections of track, but when in the other position it kills power (‘J’&’K’ Lenz terminals) to both end sections, provides programming feeds (‘P’&’Q’ Lenz terminals) to the middle section and lights the LED.
The whole wiring of the switch was greatly helped by my acquisition of a temperature controlled soldering station with money I got for my birthday.
Once the wired switch was installed into the back of the housing it reminded me of the back of an old television tube. Anyway, all I’ve got to do now is connect it all up.