This installation is for a HO-Scale Alco P2K using a TCS WOW121-Diesel Decoder, RTR-MB1 Motherboard with built in Keep Alive™
and 28mm WOWSpeaker by TCS.
HO-Scale Alco P2K shown prior to installation.
To start off this install, we must first remove the front screw highlighted in the above left photo in red. The entire coupler then can be carefully removed
by pulling it backwards through the coupler opening as a complete unit. The rear coupler can stay in place.
Next, carefully release and remove the bottom fuel tank and then remove the four screws highlighted above in red.
With the front coupler and these screws removed, gently pulling outwards along each side of the frame, releasing the ladder clips and lift the shell off of the frame.
Take care with the handrails as you lift off the shell so they don't break.
The Alco P2K shown with the shell off.
Unplug and remove the wires from the original lighting board and remove the 5 screws, whose locations are highlighted above in red.
The screw located under the front light tube will require gently releasing the light tube temporarily to gain access to the screw.
With these screws removed, lift the board from the frame along with the cab interior. Save this front screw and the screw and wire on the
right side of the frame that was securing the track pickup. This wire lead will be reused.
With the board removed, first unsolder the motor lead shown above that is attached the the metal clip. As the RTR-MB1 has a convenient motor pick up clip
attached to the bottom of the motherboard, this lead will be unused.
After the wire lead is removed, bend the front end of this clip straight to be able to accept the RTR-MB1 motherboard.
Next, take the cab interior and with a small cutting blade, remove the portion that is highlighted above in red.
This will allow space for a proper installation
of the RTR-MB1. When complete, reinstall this piece back onto the frame and reinstall the front screw and track pickup wire and screw.
Shown ready for the RTR-MB1 motherboard. Trim, tin or lengthen the wires as necessary.
Attach the RTR-MB1 on top of the metal clip and solder the motor and track leads to it according to the included wiring diagram.
As this locomotive has only track one pick up lead for the right side, the wire lead is jumped over as shown above. 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.
Next, to facilitate the speaker mount, clip or file off flush the small post on the rear weight highlighted above in red.
Using double sided foam tape, with the 28mm WOWSpeaker inserted into the UNIV-SH2-C housing, securely mount this assembly to the top of the
frame as shown above. Solder the leads to the RTR-MB1.
Next remove the top black plastic Mars light mount by squeezing the two tabs found on the bottom of it that are inserted into the two square holes highlighted above in red. WIth this removed, lay the pre wired headlight LED into the exposed channel highlighted in blue and using a small amount of hot melt glue, secure this LED in place.
Replace the top Mars light mount and likewise, lay the pre wired Mars light LED into this channel, securing it with a small amount of hot glue as shown above.
Solder these lighting leads to the RTR-MB1 according to the included wiring diagram. In this installation to allow for the Mars light function, we soldered the headlight to the FL pad as shown with a in-line 1/6 w 1k resistor and the Mars lead to pad #1. As this row of pads has built in resistors, none was needed for this LED.
You can now plug in your WOW121 decoder.
Now you can close up the locomotive and reinstall the bottom screws and front coupler assembly. Be sure to be mindful of wire routing and reassembly of the shell as to not damage or foul the installation. Your Alco P2K is now WOWSound equipped and ready to roll!
Click here for important information on properly Stripping and Tinning wire