RailPro > RailPro Specific Help & Discussion

Cannot get lights to work

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Blueleader:
Well I installed an LM-3S on a BLI Centipede today and cannot get the lights to work. It was DCC and I pulled the board and did a hard-wire. Sounds and movement all work perfect but no lights. I followed the Ring diagram and put the blue wire common to the grounds on the LED's. I ran 1K resistors in line with outputs 1,2, & 3 to the positive of each LED. The Centipede made it around my helix great but I have 2 track elevation changes that it doesn't like and the front and rear trucks lift all 16 drive/pickup wheels off the track just enough to stop it...Time to call out the MOW team. Any help appreciated on lights.

Alan:
The blue wire is positive. The module outputs are ground when on.

Blueleader:
So unlike usual installs where the resistor goes on the positive of the LED, here it goes on the ground?


--- Quote from: Alan on February 10, 2018, 02:17:55 PM ---The blue wire is positive. The module outputs are ground when on.

--- End quote ---

William Brillinger:
Have a look at the wiring diagram at the bottom right of this PDF:

www.ringengineering.com/RailPro/Documents/LM-3Instructions.pdf

Alan:

--- Quote from: Blueleader on February 10, 2018, 02:26:11 PM ---So unlike usual installs where the resistor goes on the positive of the LED, here it goes on the ground?


--- Quote from: Alan on February 10, 2018, 02:17:55 PM ---The blue wire is positive. The module outputs are ground when on.

--- End quote ---

--- End quote ---

The resistor can be on either positive or negative. It is common convention to put the resistor on the positive side but electrically it doesn't matter.

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