Wiring directly to a Bachmann loco (R, M+, L-, B+, L+, B-, M-, L)
Category : Articles
The BlueRail board can be used as a plugin board (plugging into a DCC-Ready port) or as a complete replacement PNP board. Sometimes when putting the BlueRail board into a tight place, it is preferable to remove the old board to make space for the BlueRail board. On Bachmann boards, each wire usually has a letter code where it is soldered to the board. Here is a list of some of the letter codes to help you determine what each wire leads to:
| Letter Code | Purpose | NMRA wire color |
| R | Right Rail (+) | Red |
| L | Left Rail (-) | Black |
| M+ | Motor positive | Orange |
| M- | Motor negative | Grey |
| L+ | Light positive | Blue |
| L- | Light negative | White, Yellow, Green or Violet |
| B+ | Battery positive | – |
| B- | Battery negative | – |
Once you have identified each wire, simply connect them to the color-coded wire on the 9-pin harness as in this diagram:
