I am replacing the incandescent Lionel bulbs in my Lionel series 2412-2416 passenger cars. The cars came from different lots over the years.
Here’s what’s happening: in some of the cars, replacing both bulbs with LEDs works fine, but in others, I need to leave one incandescent bulb in place (which now does not light up) in order to have the LED in the other socket illuminate.
Im guessing that some of the cars have parallel wiring and some are wired in series.
What should I do with the cars where only one LED illuminates? If I have to do some rewiring, a simplified diagram would be helpful.
Thanks.