I did another incandescent to LED conversion on an MTH Passenger dome car this afternoon. Yesterday I had installed a switch in the bottom of the car so I would have the option of turning off the LEDs that will be in the dome. It took me 2 hours to install everything. Used fine magnet wire to connect those LEDs in the dome to the buck converter via the switch and a disconnect. During the last week I also converted a couple of MTH ARR baggage and coach cars.
Larry