MTH SD70ACe TCS T6X Decoder w/LH Harness Install
By Thomas R Gosser, Big Lake, Alaska




This T6 install will give you separate control of head and tail lights, flashing ditch lights and number lights.



Using protected tweezers or other suitable tool you will need to pull the cab attached handrails out of the front of the cab.



Likewise the handrails will need to be removed from the left and right hand sides of the rear cab. And from the stanchions as
indicated by the circles. Place the rails toward the outside of the stanchions for shell removal clearance.



Turning locomotive upside down pry off front and rear truck bottoms as shown.



Using protected tool pull truck side frames off as shown. Be careful as the side frames are connected to wires.



Remove each wheel set and set off to the side being aware of gear orientation.



Once the side frames and wheel sets are out of the way we can remove the locomotive shell by prying the indicated tabs out
of the way as indicated by the arrows. The shell will lift off from the top. After the shell has been removed reinstall the wheel
sets and truck side frames. Be sure side frames are fully inserted and parallel to trucks when installing the bottom covers. As
the covers snap in place holding it all together.



With locomotive now right side up we see the pcb light board. Remove the NMRA socket jumpers and the number light and
ditch light clips on either side of the board.



Plug the harness in. You will need to cut the green wire. Cut as close to the NMRA plug as possible. Strip off some insulation
from the green wire as this wire will be connected to the ditch light right (D_R) connector on the pcb.



Strip off some insulation from the brown and lavender wires coming from the T6 Decoder. Connect the wires as shown to the
pcb as shown. D_L = ditch light left, NUM = number lights, D_R = ditch light right.



Using kapton tape start taping wiring harness out of the way as shown.



Use double sided mounting foam tape to mount the decoder as shown. The harness will be taped out of the way, and now the
shell can be replaced. After you check installation first! Consult TCS Additional Programming handout for setting up the
ditch lights. The Number lights can be controlled from F3. Once shell is in place carefully reinstall the hand rails.