Can anyone please advise on the following.
In the past I have converted Bachmann Class 159 to dcc running. At both end cars I remove the lights and solder new LEDs into the old "bakalite" [sp?] templates, I insert a 10k resistor on the white circuit, nothing on the red, but then a 6.8k on the common blue return. These were connected to a separate decoder in each car and I was happy with the resulting led brightness [the white is slightly brighter than the red]. At one car I swap the white/yellow wires when connecting to the decoder so the lights are opposite to the other car.
This has worked fine but needs three decoders.
I thought I would try and wire everything back to a single decoder in the middle [power] car. I had already converted the lights and installed the resistors when I changed tack and thought about bringing the wires back to the centre. Unfortunately this means I have glued back the bulkhead [which has to be removed to gain access to the screw holding the lights in place!] so it's a quite a job to cut out again to replace the resistors, which is something that is looking like I might have to do.
The lights did not work although I've made a right pigs ear of the wiring with too many suspect 3 pin micro connectors. I am going to redo the wiring but this time I am going to run continuous wires from the lights all the way to a Y connection at the central decoder.
My question is by splitting the decoder output I am obviously putting the circuit through the white resistor but also two resistors in the blue returns. But I am struggling to understand if I've split effectively into two parallel circuits, rather than a series, would this have an effect on the brightness?