For my Labor Day Weekend project, I'm planning to do my first real wired decoder install (I installed a wired decoder into a Tomix Thomas the Tank Engine last year, but it was too easy to be considered a *real* wired install ). The subject is a Digitrax DZ126 into Life-Like 2nd Generation GP38-2, released in the mid-2000s. It's actually a good DC runner and even looks great for a Life-Like, despite it not being DCC-ready. I tried selling it in the past but got no takers. I figured I'd hold onto it since it was the last thing I bought from a beloved LHS right before they closed for good, so there's some sentimental value in it for me. The decoder is small enough to fit under the existing light board without any frame modification.
Anyway, I understand the basics of installing a wired decoder -- make sure the motor is totally isolated from the frame, most of all. I have Kapton tape and have been taping off the inner barrel where the motor sits. The rest is somewhat straightforward as far as where to solder.
Thing is, it has an analog light board and from running it DC, I like the brightness and the LED glow (nice golden color, not the ugly cold white from other LEDs). Plus, it has the LEDs in the correct position for the front and rear lenses, and if I did remove the analog light board, then I'd have to manually wire in some SMD LEDs + resistors.
Here's what the frame looks like (Image from the Spookshow.net entry on this loco):
So, is there a way to install this wired Digitrax decoder and use the existing light board? If so, how would I wire in the yellow/white/blue wires? And would I also have to isolate the light board from the frame? Or is it best to remove the light board and use my SMDs/resistors?
This is what the decoder looks like: