This installation is for a HO-Scale Athearn Genesis GP38-2 using a TCS WOW121-Diesel Decoder and GEN-MB1. This install was performed by TCS.

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
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-ATH-2 which was used for this installation.
GEN-MB1 Motherboard with Keep Alive™ WOW121-Diesel Decoder GEN-SH1 Speaker Kit
Click here for more information on the WDK-ATH-2 and the rest of the WOWDiesel Kits line.

HO-Scale Athearn Genesis GP38-2 prior to WOW121-Diesel Decoder and GEN-MB1 installation.

HO-Scale Athearn Genesis GP38-2 prior to WOW121-Diesel Decoder and GEN-MB1 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.

Do this by holding the fuel tank with one hand and lifting the shell off by pressing up underneath the end platforms with your other hand.

With the shell off, we can now remove the factory light board. First remove all the black wire clips and disconnect the wires from the board.

All the wires have been unclipped prior to taking the above photo. Once the wires are loose the factory light board will then easily unclip from the motor mount.

Since we're installing sound in this locomotive, we need to remove the speaker housing weight. The two screws need to be removed to do so.

With everything removed, we can now install the GEN-MB1 and solder our pick-up and motor wire leads.

Next, secure the GEN-SH1 and 35x16mm speaker with the two screws from the weight removed earlier.

Next, solder the speaker leads to the GEN-MB1.

To secure and seal the screw holes on the speaker, some hot glue worked well if the fit is loose.

Lastly, we need to attach our headlight leads to the front and rear headlight pads on the GEN-MB1.

For the installers convenience, the forward and reverse headlight pads are already setup for 1.5v bulbs that Athearn models use.

If you require a 12v supply, please follow the GEN-MB1's instruction manual on how to do so.

This model also features a rotary beacon which we wired to funtion one.

With all three main components mounted, we can now close up the locomotive and reinstall the coupler assemblies.

You have now installed a TCS WOW121-Diesel Decoder and GEN-MB1 into your HO-Scale Athearn Genesis GP38-2.

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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