Wiring up a decoder

Discussion in 'HO Scale Model Trains' started by Amrap1, Nov 27, 2006.

  1. Amrap1

    Amrap1 Member

    I have a Bachmann Chessie C&O 4127 HO loco that I want to wire for DCC. I can't find any info anywhere! It seems to be a very simple Loco, Just 2 wires from the front wheels and 2 from the back on a simple PC board with nothing but 2 lights that are always on.

  2. shaygetz

    shaygetz Active Member

    Sounds fairly easy but a picture would be a great help if you can post one.
  3. Thoroughbreed

    Thoroughbreed Member

    I've got a spectrum dash8-40cw dcc ready, and inside the shell is nothing more than a pc board atop the motor, but with a 8 pin dcc connector, which is prob what you have if its recent. Prob looks like this [​IMG]

    then you can put a decoder on to replace the plug [​IMG]

    photos from © Copyright Train Control Systems 2005
  4. fseva

    fseva Member

    Need a decoder!

    announce1You need to decide which decoder you want to install... Do you just want control & lights, or do you also want sound? Does your analog PCB include a DCC socket with a dummy plug installed? If so, you can use a decoder with a DCC plug - just pull out the dummy plug and insert the decoder's plug. If you don't have a DCC socket, you need a "wired" decoder (no plug) - this is slightly less expensive. Along with your decoder, you will get a manual that includes all the info you need to install the decoder, including directions on which colored wire gets connected to the wires already in your locomotive.
  5. Russ Bellinis

    Russ Bellinis Active Member

    If your loco isn't dcc ready, Loys Toys has a section of their web site with instructions on how to install dcc on various older locomotives www.loystoys.com I think Tony's Trains also has some helpful instructions on installing dcc in older predcc locomotives, but I don't have that site saved in my "favorites." I didn't see anything on their site about Bachmann locomotives other than some steam engines. What is a Bachmann C&O 4127? Is it steam or diesel?
  6. Amrap1

    Amrap1 Member

    It's diesel. There are only 4 wires....Black and white from front wheels/motor and the same on rear wheels. The PC board between has NO diodes/resistors. I want to believe that it would/should be the easiest loco to convert.

  7. LongIslandTom

    LongIslandTom Member

    I managed to find a photo of that particular Bachmann loco Amrap1 said he had..

    It looked like an old Bachmann U36B. If I remember right, those used the notorious pancake motor drive, and only 1 truck is powered. I wouldn't even attempt to convert that to DCC-- It would be a certifiable nightmare.

    Attached Files:

  8. fseva

    fseva Member

    Yes, it should be easy! Must not even have lights...right?

    All you need is a decoder with a decent instruction manual and you'll have everything you need. It'll tell you which color-coded wires should be hooked up to your black and white wires. Unless you're color-blind, it should be a piece of cake! :D

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