To expand further, I had a bit of strangeness happen when I went to permanently install the Revolution into the K-27 this past week. The blippin’ headlights wouldn’t work. No forward, reverse, nothing! No marker (class) lights, cab, or firebox lights, either. Everything worked fine with the “dummy” plug installed, so I know the internal electronics were good. The motor control and all that jazz worked perfectly, but no lights for love or money. When I went to control the lights through the Aristo adapter board, they worked (almost) fine, but I think that is an issue with the adapter board–though it could be the decoder issue, which might have caused the B-mann board to not work properly. Without a second decoder to test (I wasn’t in the mood to open the tender of my Mogul to pull that one out), I just kept plodding along with what I had in front of me.
In the end, I gutted the socket from the tender and wired everything direct to the Aristo board via their small adapter board that comes with the Revolution. This was actually pretty clean (and dirt simple) because all the necessary wires are already there in the tender. All you need to do is figure out which goes to what, which you can do from looking at the stock socket board. (hint: either pull the wires from one board and solder to the next as you go, or flag each wire as you unsolder it.) I think my little adapter board is “faulty” in that the front headlight is on all the time, not directional (and doesn’t respond to the “on/off” control from the transmitter), but I found a better solution to that problem anyway.
The cab and firebox lights are wired to the front headlight control pad, since (on my board) they’re on all the time. I figure since it’s a steam engine, there needs to be a fire in the firebox if you want it to move, so why not have that on all the time? The cab light as well, since it’s something that would also be on all the time so the engineers can see the gauges in tunnels, etc. What I don’t know is how you’d control them to be on all the time if the board was working “properly.” I’d think you can just connect them across the battery inputs, but I’m not certain. That, or across the common (+V) output and ground. If my board is shorted the way I think it is, that’s essentially what I have.
The headlight and marker (class) lights I control via the accessory controls on the Revolution. Just solder the control wires (in my case, I’m using keys 5 and 6–red and brown wires respectively) to the appropriate wires going up to the locomotive. This way I can control the front headlight independent of the direction of the locomotive, and it’s also on when there’s no voltage going to the motor. (I believe the Revolution turns all headlights off when stopped.) The marker (class) lights can be turned on independently as well, as befitting the train orders. The rear headlight is wired to the board as normal, and comes on only when the loco is moving backwards.
Note: I did nothing to any of the electronics on the locomotive itself. All that is stock and untouched. I just took the socket board out of the equation.
I’m at a loss to explain why the Aristo decoder wouldn’t control the lights via the stock B’mann board. I don’t know if it’s an Aristo or Bachmann issue. At this point, I’m unlikely to find out unless another stock K-27 comes through the workshop while I have a spare Revolution decoder sitting unused. Of course, at this point–for my purposes–the reasoning is moot since I’ve worked around it. Still, I’d like to know so the next time someone asks me if they’re compatible, I don’t have to use an asterisk in my response.
Later,
K