Med, thank you for the parts suggestions. Seems I still have a little to learn before I order parts. See below.
Stan2004,
1-the wire is a 22/12 conductor cable. Wires were twisted into 6 pairs on the ends not in the cable. Currently using 5 pairs.
2- eventually all six pairs will be used as I add more buildings. I also have other spare wires run for future accessories.
3- there are no resistors at the ends of the wires. I do not now if there are resistors in the LEDs. Could be why they are burning out. Kind of why I’m here looking for help.
4- I checked voltages at the ends of the wires today. The longest wire run to a building with all LEDs not working anymore was 4.7v. The second longest run was 4.07v but still has a few LEDs working. The third building that the LEDs are still working was 3.01v. In the past I must have measured the voltage with the LEDs hooked up. You are correct about the voltage drop. No drop in the runs with nothing hooked up.
5- the drawing was showing the operating specs for the motor. It is connected to 1pair. It does work at the lower voltage. I’m not looking to control the speed. Just want it to run at a realistic speed. It only runs occasionally when I run the train. Separate switch.
6- perhaps simple was not the best choice of words. I read a lot of post on LEDs and watched some videos. My background is in industrial control system. Installation testing and commissioning. The electronics were figured out by some one else. Maybe I am making this too complicated, information overload, or a lack of critical thinking skills. There is probably a dozen ways to accomplish my goal. I went cheap and easy last time. Soldering is not a problem. I’m looking for reliable parts that will work together for more than a year or so. I am more concerned with reliability and longevity than cost. I’d rather build than buy where possible including the electronic. I just need to know what parts to use. That is the part of this hobby I like. Experimenting is not my favorite thing to do.
What I was unsure about is are the LEDs wired in parallel or series in the house and could each house be wired to a common buss.
I appreciate you taking the time to dig deeper to get the information necessary to give good answers.
