This installation is for HO Scale Bachmann using a SD-45 of TCS WOW121 Decoder, GEN-MB1 motherboard with Keep ALiveā„¢, motherboard mounting clip
and UNIV-SH1-C WOWSpeaker.

This was performed by our friends from DCC Xpress installations.
They offer high quality WOWSound installations for a flat rate complete with free return shipping!
You can find them at:

These items are available in the WDK-BAC-1 which was used for this installation.
GEN-MB1 Motherboard with Keep Alive™ WOW121-Diesel Decoder UNIV-SH1-C Speaker Kit Motherboard Mounting Clip
Click here for more information on the WDK-BAC-1 and the rest of the WOWDiesel Kits line.

Important Soldering Tip:
Please do not use any flux either liquid or paste on the mother board. It will damage it. Use only Rosin core solder approved for electronics use.
We recommend to use only Kester "44" rosin core, SN63PB37, .015" diameter, part number 24-6337-0007.
This can be ordered from Techni-Tool under Techni-Tool part number 488SO157

The Bachmann SD-45 shown with the shell on prior to installation.


To begin, first remove the front and rear coupler screws and boxes as highlighted above.

Shown with the shell off. Remove the wires from the original lighting board, unscrew the board from the chassis and remove it.

With the original lighting board removed, trim, tin or lengthen the wires as necessary. Important: Remove the yellow capacitor attached to the motor
as highlighted in blue above. It will cause speed control problems for the decoder if left in place.

Using double sided foam tape, secure the board mount to the top of the motor and then attach the GEN-MB1 to the board mount.
Solder the motor and track connections to the GEN-MB1.

To facilitate a level platform on which to mount the speaker enclosure, file off the original board mounting tabs as shown above.

Next, insert the 35mm x 16mm speaker into the UNIV-SH1C enclosure and using double sided foam tape, mount this assembly on top of the frame.
Solder the wire leads to the GEN-MB1.

If your speaker enclosure installation covers the portholes on the enclosure, we recommend adding new port hole(s) similar to the original porting. Be sure that the new portholes are the same size and amount of the original and are vented freely into the locomotive We have found introducing a port of the correct size greatly increases the volume and sound quality of the installation. Too much or too little porting decreases the sound quality.

According to the included wiring diagram, solder the front and rear lighting leads to the GEN-MB1.

You can now plug in your WOW121 decoder.

Lastly, in order to keep the wires neat and prevent possible shorts, lace the wires into a bundle using lacing cord, which is a wax impregnated string 
used for wire bundling and making harnesses. There are many choices of lacing cord available from Digikey
We use part number 802534B BK032-ND

Now you can close up the locomotive and reinstall the coupler assemblies. Be sure to be mindful of wire routing and reassembly of the shell as to not damageĀ 
or foul the installation. Your Bachmann SD-45 is now WOWSound equipped and ready to roll!


Other solder tips: When stripping wire, only strip a tiny little bit of the insulation. Strip no more then a 1/64 of an inch. When the wire gets tinned with solder the insulation will shrink back more. Try to not expose any more wire then half the length of the solder pad at most. In no case should solder or exposed wire wire ever be outside the boundary of the the solder pad you are attaching a wire to.
Click here for important information on properly Stripping and Tinning wire

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