This installation is for Athearn GP38-2 uses TCS MC2 decoder and was performed by A.G
The three upper pictures illustrate the beautiful shell of Athearn GP38-2 prior to TCS MC2 decoder installation.
Grasping the shell by the solid area between the grills, lift the shell straight up and off of the chassis.
Remove the copper bar that supplies voltage to the bulb.
Remove four circled in red screws so that the motor can be removed from the chassis.
Here is the picture of the motor that was removed from the frame.
Use some electrical tape to Isolate the chassis from the motor as marked in red in the picture above.
Solder the orange wire of the decoder harness to the bottom copper tab of the motor. Isolate the solder point and reattach the motor to the chassis.
Solder the gray wire of the decoder's harness to the top copper tab of the motor as shown in the picture above. Isolate the connection with an electrical tape.
Solder the red decoder's harness wire to the front power pick-up tab (as shown in the picture above)
Solder the black decoder's harness wire to the front power pick-up tab as shown in the picture above.
There was no voltage specifications for the Bulb that was originally used in the locomotive so we decided to use LED. The 680 Ohm resistor was placed and all the installation was isolated. Use the white and blue decoder's harness wires to connect the light.
Here is the picture of finnished TCS MC2 decoder instalation.