Kit: Zimo MX645 with Zimo Dumbo LS26X20X08-1W, lamps, firebox glow, MX681 function decoder
This will be a dual-decoder installation with the primary decoder (MX645) in the tender providing motor control, sound and
control of lamps on the back of the tender, and a secondary function-only decoder (MX681) in the loco to give control of
firebox glow light and front buffer-beam lamps.
First, let's tackle the tender... chop out some of the plastic slope under the coal load to make room for the Dumbo speaker.
Add in the MX645 sound decoder, and a 470uF stay-alive for good measure.
Add a couple of lamps on the back - one red and one yellow for direction and wire up to the decoder's BLUE (common positive) via
a resistor and WHITE and YELLOW wires for directional lighting.
Now for the loco... once disassembled, we push out the bulk head and fit a firebox glow SMD LED. The wiring and MX681 decoder will
all eventually sit inside the back of this assembly.
The MX681 is tiny, so it should be easy to find a home for it.
To route the wires for the lamps on the buffer beam, we create shallow channels underneath the frame.
It will be very tight for the wires as the boiler is packed with weight, so we also make a channel inside the boiler along the
top. We don't want any wires to pinch or snag when the body is put back together later.
Now install the lamps, glueing the wires into the channel we created earlier.
Next we attach the MX681's RED and BLACK pickup wires into the model's pickups, intercepting the wires on their way back
to the 4pin plug. Not much space to play with here, so be neat! Connect everything up and test.
Once reassembled, add the happy chappies.
Paint the lamps black to be more authentic.
Add some crushed coal ballast for realism.
Join loco and tender up pand give a final test.
Photo opportunity time...