Massoth decoder: front and rear lights

idlemarvel

idlemarvel

Neither idle nor a marvel
Country flag
I want to have the option to have both front and rear lights on at the same time, as in shunting mode.
Using a Massoth XL as an example in the diagram below, how should I wire it up so that if F1 is pressed (which turns on A1 output by default) that will turn on both front and rear lights? I know that front lights are connected to LI-V and +24v and rear LI-H and +24v, with the actual voltage to the lights (if not full track voltage) adjusted according to needs using CV settings.
I feel like I should be able to just connect A1 to LI-V and LI-H but I'm concerned I will short something inside the decoder if I do that. Help please.

Untitled.png
 
All the lights are connected to the +24v as a common supply, and you are switching the negative 'ground' connection, so you can do as you suggest..

I have used this to allow day and night running, on certain models, where a light is brighter running in daylight, than in darkness.

Just make sure, if necessary, you have set the voltage correctly on all the function / lighting outputs you are using.

PhilP.
 
PhilP said:
All the lights are connected to the +24v as a common supply, and you are switching the negative 'ground' connection, so you can do as you suggest..

I have used this to allow day and night running, on certain models, where a light is brighter running in daylight, than in darkness.

Just make sure, if necessary, you have set the voltage correctly on all the function / lighting outputs you are using.

PhilP.
Click to expand...
As Phillip warns ensure that the Voltage is correct for your chosen Lights. The default setting when you buy the decoder is the full 24v so you need to change the relevant CV before you try the lights.
 
If you're going to connect both light to A1 as well as leaving them connected to LI-V or LI-H, you'll need to make those extra connections using diodes otherwise both lights will also light when LI-V or LI-H is on.

Drawing1.gif
 
Thanks JohnS. I think I prefer the earlier solutions as they minimize wiring. If I use A1 as an additional output for forward lights and A2 for rear lights, and have them both triggered by the same function key, then I won't need any diodes. Bit wasteful of outputs but there are plenty on an XL.
 
I would just set CV51 and CV52 to 192. Now you can turn lights on and off with F0, but both front and rear will be on with no parts added.
 
Just to close this off, on the XL decoder I connected A1 to LI-H (rear lights) and A2 to LI-V (front lights) and set the A1 and A2 outputs to 5v and to be triggered by the same function key, F8 in my case, which also sets shunting speed. So F0 sets the lights on according to direction, F8 switches both front and rear lights on, which is what I wanted. Incidentally the LI-I (internal lights) connection comes on as well if A1/A2 are triggered when they are hard wired to LI-H and LI-V.
 
idlemarvel said:
Just to close this off, on the XL decoder I connected A1 to LI-H (rear lights) and A2 to LI-V (front lights) and set the A1 and A2 outputs to 5v and to be triggered by the same function key, F8 in my case, which also sets shunting speed. So F0 sets the lights on according to direction, F8 switches both front and rear lights on, which is what I wanted. Incidentally the LI-I (internal lights) connection comes on as well if A1/A2 are triggered when they are hard wired to LI-H and LI-V.
Click to expand...

Hi Idlemarvel - Another option you have with the Massoth XLS/XL DCC Decoders is to wire the headlight and taillight as normal, but then set CV51 to 0. This is the standard approach I use with my locos, which keeps the headlight on in both forward and reverse directions. The taillight will she stay directional, on only in reverse. This is more protypical of actual USA RR operations in the USA, unless a locomotive is pulling a consist in the reverse position. If you want the taillight to stay on in both directions, then also set CV52 to 0.
Tom
 
Thanks Tom. Something similar was suggested in post #9 by D Dan
The downside is that it does not let you choose when you want both front and rear lights on.
 
You must log in or register to reply here.
Back
Top Bottom