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Thread: DCC Loco. Light Question

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    Lightbulb DCC Loco. Light Question

    I have an Atlas Dash 8-40B with DCC that I got used. Runs great at all speeds in both directions with breathtaking creep. The light switches on and off by command in DCC, but it is a little flaky on DC. On one DC test track, the headlight will light in the forward direction, while only momentarily flashing on at startup and then intermittently flashing on and off during reverse movement. On another tight DC test circle, the light won't come on at all in either direction. I haven't a clue as to what's going on. Do any of you have any idea what's happening?
    Don

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    Generally with a DCC loco on a DC track you need a lot more power from your controller to get the loco to move, and this could account for the intermittent lighting problems. As the loco is working correctly in DCC, then there is no need to make any changes. The loco is getting power and the decoder is responding to the controller's commands as you have indicated.

    If you were supplied with the original lightboard and want to run the loco in DC, switch out the decoder and reinstal the original lightboard.

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    It might be the track even. Since you mentioned two different DC test tracks apart from the layout, give the tracks a little cleaning and test.
    Ganesh

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    Quote Originally Posted by Zombinowski View Post
    It might be the track even. Since you mentioned two different DC test tracks apart from the layout, give the tracks a little cleaning and test.
    Thanks to all for your replies. My frame has a copyright 2001 date and the decoder is labeled "N163A4 R1", which, apparently according to the chart below (which I hope doesn't get reformatted), was recommended for different locomotives than the Dash 8-40B. Nevertheless, it runs fine:

    Manufacturer Locomotive Model Recommended Digitrax Decoder


    Arnold S-2 DZ143, DZ125


    Atlas 2-6-0 DZ125
    2 Truck Shay DZ125
    B23-7 DN163A0, SDN144A0
    B30-7, B36-7 DN163A0, SDN144A0
    C-420 DN163A0, SDN144A0
    C-628, C630 DN163A0, SDN144A0
    Dash 8-40B, Dash DN163A0, SDN144A0
    8-40BW, Dash
    8-40C
    Dash 8-32BWH DN163A0, SDN144A0
    GP7 , GP7TT DN163A4
    Released after
    4/2006
    GP9 Released after DN163A4
    4/2006
    GP30 & GP35 DN163A4
    Released after
    9/2007
    Don

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    Quote Originally Posted by donstaff View Post
    ...On one DC test track, the headlight will light in the forward direction, while only momentarily flashing on at startup and then intermittently flashing on and off during reverse movement. On another tight DC test circle, the light won't come on at all in either direction...
    The momentary flash at startup is normal. When the decoder powers up, the lighting functions will be on until the software in the decoder turns them off. You can see this on DCC as well - if you turn the lights off on the locomotive and turn track power off and then back on the lights will flash briefly when the power comes back on. The intermittent flashing is an odd one, I can't think of anything right off hand that would cause that. As far as the lights not working on the second circle, did you run the engine on DCC again before running it on the second test circle? If so, you probably turned the headlight off while on DCC. Digitrax decoders remember the last DCC state of their lighting functions when running on DC, so if the headlight was on on DCC, it will be on on DC, if it was off on DCC, it will be off on DC.

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