This installation is for a HO Scale Ahearn GP38-2 Early Version using a TCS WOW121-Diesel Decoder, RTR-MB1 Motherboard with built in Keep Alive®
and UNIV-SH4-C WOWSpeaker kit.
|These items are available in the WDK-ATH-10 which was used for this installation.|
|RTR-MB1 Motherboard with Keep Alive™||WOW121-Diesel Decoder||UNIV-SH4-C Speaker Kit|
|Click here for more information on the WDK-ATH-10 and the rest of the WOWDiesel Kits line.|
HO-Scale Ahearn GP38-2 Early Version shown prior to installation.
To start off this install, we must first release the front and rear tabs on the frame bottom as highlighted above in red.
With these released, while gently pulling upwards along each side of the frame, lift the shell off of the frame.
Take care to release the handrails as you lift off the shell so they don't break.
The Ahearn GP38-2 Early Version shown with the shell off. Remove the wires from the original lighting board and remove it from the chassis.
The RTR-MB1 has a motor pick up clip pre-attatched to the bottom, so mounting it onto the locomotive could not be easier.
Clip the RTR-MB1 to the frame and solder the motor and track pickup wires according to the included wiring diagram.
When attaching the wires to the pads, it is not necessary to insert the wires through the holes. We recommend attaching the wires flat on top of the solder pads
In this installation, we replaced the original 1.5v bulbs with LEDs using a small dab of hot melt glue to secure the front and rear LEDs to the shell as shown above.
With the 25mm X 14mm WOWSound speaker inserted into the UNI-SH4-C enclosure, mount this assembly to the shell as shown with double sided foam tape.
The RTR-MB1 and GEN-MB1 have on board 1.5volt power supplies to conveniently power all the original 1.5volt bulbs that come with your Athearn locomotive. The front headlight and rear light pads are configured for 1.5volt use. Additional 1.5volt pads are available for other connections for ditch lights etc. If you prefer to use LED lighting as an option, there are LED solder connection pads. Current limit resistors are built into the board so no external resistor are needed for LED use.
To allow for space to ensure the proper clearance for the decoder installation, there is a section of shell and a weight that must be trimmed.
This is located inside the removable top piece of the shell. With this piece removed, trim back the shell top as shown above, along with trimming
the weight approximately 1/2".
Reinstall the weight into this cavity and reattach the piece to the top of the shell.
With the shell top complete, solder the speaker and LED lighting wire leads to the RTR-MB1 according to the included wiring diagram.
You can now plug in your WOW121 decoder.
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 damage
or foul the installation. Your Ahearn GP38-2 Early Version is now WOWSound equipped and ready to roll!
Click here for important information on properly Stripping and Tinning wire