Messages From digitrax



#22847 Oct 11, 2000

Message: 20

> Date: Tue, 10 Oct 2000 21:21:20 -0000

> From: "Steven Skinner" trainman6555@...>

> Subject: Re: Fleichmann BR41 forward lamp problem


> Dear Jean-Louis,

> I assure you it is not my intention to mislead, I,ll explain,


> --- In, "Jean-Louis Simonet" simonet@c...>

> wrote:

> > Steve,

> >

> > > *Not correct,the chassis is connected to the black wire only (left

> > > Rail).


> The above is the fact I was trying to point out, and below is the

> knowledge I have gained from reading only my DIGITRAX MANUALS.


> When using half wave lighting with a DIGITRAX decoder, The

> > > front lamp positive supply must come from the OPPOSITE rail than

> the

> > > rear lamp(see decoder installation guide book. and as the rear

> lamp

> > > comes from the chassis as well as the front lamp, it is here the

> > > problem arises.

>That is not what I read from of my Digitrax manual. From the DECMAN.PDF

available on Digitrax web site on page 18 in the first paragraph:

(quote, cut and pasted form DECMAN.PDF)

If light common is not used, connect function power to either track

power pick up for "half wave" operation. The directional light function

"lamp Return Line" can be hooked to light

common as shown or to either track pick-up.

(end quote)

The diagram on that page (18) also shows the common for all funtions

connected to the red wire but with the statement above eather the red or the

black wire could be used.

I think I know how this misconception came about: Probably from a wiring

diagarm for a typical US brass steam loco, where the loco pickup up power

from the right rail only (red wire) and the tender from the left rail only.

In that case if using half wave lights then the easiest way to wire it would

be for front light (in loco) white wire to lamp, other lamp lead to loco

chassis (red wire); while the rear lamp (in tender) yellow wire to lamp,

other lamp lead to tender chassis (black wire). This configuration is

easiest for this type of install but does not have to this way in every

install. For the loco in this descussion, it apears that connecting both

lamps other lead to the chassis (black wire) whould be the easiest install.

I personally try to allways use full wave lighting (use blue wire) as the

club I am in allows for people to use analog train control, so with analog

and half wave the light briteness vaires when the analog locomotive speed it


Michael Mosher

Daylight Division of PCR / NMRA

2001 Convention, May 2 - May 6, 2001

San Luis Obispo Model Railroad Club