This installation is for a HO-Scale Bowser C-636 using a TCS WOW121-Diesel Decoder and INT-SH1 WOWSpeaker Kit. This install was performed by TCS.

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-3 which was used for this installation.
WOW121-Diesel Decoder KA4 Keep-Alive™ JST Speaker Harness INT-SH1 Speaker Kit
Click here for more information on the WDK-BOW-3 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 C-636 prior to installation.


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

With the shell off, we can now remove the original light board. Next connect the KA4 Keep Alive. In order to install the KA4 we need to attach the black/white wire to the bottom of the light 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.

Be sure to strip and tin the black/white wire and keep the exposed wire very short. Trim it as needed before soldering it to the R4 resistor.
The exposed wire should not be any longer then the width of the resistor. Any wire protruding beyond the solder pad of the resistor will lead to shorts and likely a failed
decoder installation. Use only rosin core solder for this wire attachment as mentioned at the top of this installation. It is very important to tin the
wire and the R4 solder pad before attempting to solder the wire to the R4 resistor solder pad. Failing to do this will result in a problematic and messy solder joint.

With the the ground wire connected, replace the original lighting board and screw it back down to the plastic holder.

Now solder the blue lead from the KA4 Keep-Alive™ to the 12v+ Common hole from the 8-pin NMRA plug as shown below.

Next remove the two factory provided speaker enclosures. Each speaker enclosure has 4 screws, but we only need to save 2 (total) for our speaker enclosure.

With the speaker housings removed the wires that were routed below them will require some taming.
Apply Kapton tape to the frame and wires to keep the wires from shifting into the drive train.

Next, prepare the speaker housing by lacing the wires from the 2-Pin JST speaker connection through the speaker enclosure and attaching them to the 35mm x 16mm WOWSpeaker.

Note: You will also need a JST Speaker Connector (Item # 1660) to connect your speaker to this connectorized motherboard.

Screw down the speaker housing and mount the KA4 Keep-Alive™ to the frame using a small piece of double sided foam tape.

With the Keep-Alive™ installed and the speaker mounted, remove the 21-Pin dummy plug from the lighting board.

Plug the WOW121-Diesel decoder into the 21-Pin connector on the lighting board.

Replace the shell and the couplers and your Bowser C-636 with WOWSound is now 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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