Blunami bachman 4-4-0 questions

[Jarimiah]

Hi all,

So I recently acquired a old pre dcc bachman g scale American 4-4-0 locomotive( Denver model) and tender. I'm dropping in a blunami board I have and came across some questions.

1- the train didn't have a ground connection wire at all and The blunami board does. So, do i need to make one? If so can I attach a wire from the dcc board to a metal nut and glue that to the plastic frame inside the train?

2- I believe the original wiring is 22 or 24 gauge right? I'm going to have to replace some of it for the blunami board.

3- I think front light is a led. A 1k resistor should probably work fine right?

4- does the smoke unit need a resistor too?

Any tips and advice is appreciated.

[Greg Elmassian]

1 no ground needed, just available off the decoder board
2 wire gauge will be fine, it does not draw a lot of current
3 resistor is calculated by the supply voltage in the normal way
4 on the 4-4-0, I think the smoke unit is wired from the track, i.e. it is NOT a logic output, so you will need perhaps a relay operated by a function output on the Blunami. I do not have a schematic of the 4-4-0.

Greg

[Fred2179]

3- I think front light is a led. A 1k resistor should probably work fine right?

I think the 4-4-0 is of the era where Bachmann has all the resistors on the PCB, so it won't have one on the LED itself. If you are reconnecting it to your Blunami, a 1K would be appropriate.

The 4-4-0 DCC and DC wiring diagrams are on the Bachmann website.
https://www.bachmanntrains.com/home-usa/dwg/dwgs/LS4-4-0DCCWIRING.pdf
https://www.bachmanntrains.com/home-usa/dwg/dwgs/LS4-4-0DCWIRING.pdf