I have several Intermountain Cab Forwards and one of them was a victim of an early attempt to wire in a Tsunami decoder. I worked on this engine when Intermountain first released the loco and for reasons I no longer remember, I removed the motherboard from the tender and wired the decoder directly to the loco while doing this. Everything works correctly (except one thing), it moves forwards and backwards and has the correct sound for an articulated engine. It has several hours of run time.
When I finished the engine I had one wire in the loco not terminated on the decoder and I believe this is why the number boards do not light up. I recently purchased a couple Tsunami2 TSU 1100's and on that decoder I see a green lead (for fx3) and a brown lead (for fx4). So I replaced the original Tsunami with the new one and connected the loose wire, after adding a resistor, to the brown lead.
The number boards still do not light up so I am asking if there are one or more CV's I need to set to enable fx4 and turn on the lights? The other option is to connect them to the yellow wire (I did not install a backup light) but then I need to program it to be facing forward and on all the time.
