This installation is for a HO-Scale Bowser RS-12 using a TCS WOW121-Diesel Decoder, KA4 Keep-Alive™
and IB-SH1 WOWSpeaker Kit.

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-BOW-1 which was used for this installation.
WOW121-Diesel Decoder KA4 Keep-Alive™ JST Speaker Harness IB-SH1 Speaker Kit
Click here for more information on the WDK-BOW-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

HO-Scale Bowser RS-12 prior to installation.


To start off this install, we must first remove the front and rear couplers and their housings. Once that is complete, the shell will lift off of the chassis.

With the shell off, we can now remove the factory light board so we can attach the KA4 Keep-Alive™ to the underside of the board. First disconnect the wire harnesses from the board.

Once the wire harnesses are loose, the factory light board can easily be unscrewed from the motor mount.

Tip the original lighting board up on its side so you have access to the bottom of the board. Solder the black with white stripe wire from the KA4 Keep-Alive™ to the side of the R4 resistor as shown in the image below. Now solder the blue lead from the KA4 Keep-Alive™ to the 12v+ Common hole from the 8-pin NMRA plug as shown below.

With the the ground wire connected, replace the original lighting board and screw it back down to the plastic holder.
Mount the KA4 Keep-Alive™ on top of the rear gear tower using hot glue or double sided foam tape.

Next remove the factory provided speaker enclosure.

Solder the 2-Pin JST connector with wires to your speaker, mount the WOWSpeaker in the enclosure provided with your WOWKit, and use two of the screws from the original speaker enclosure to mount your speaker and enclosure in the frame.

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.

Next, remove the 21-Pin dummy plug from the original lighting board.

Finally, plug in the WOW121-Diesel decoder (with the pins from the lighting board passing up through the bottom of the decoder and into the connector), replace the shell, reattach the couplers and your WOWSound equipped RS-12 is ready to run!

Be sure to be mindful of wire routing during reassembly of the shell as to not damage or foul the installation.

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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