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Installing a NEM651 6 pin decoder into a Fox Valley Models FVM N Scale ES44AC GEVO.
We have found it best to remove the shell from the frame to allow full access to te decoder plug at the rear of the locomotive.  Care should be taken when removing the shell.  The rear fan housing may be removed first to see the rear light LED.  Tape should be removed from the LED (it there is tape) before removing the shell.  TopHobbyTrains has installed the TCS 1298 EUN651Digitrax DZ125IN, and Soundtraxx 851001 versions of the decoder and all have performed well.  We recommend that the instructions be followed for each of the decoders.  Identifying pin 1 is clearly described in the manufacturers instruction sheets. 

It is helpful to know that with the loco on the bench in front of you and the loco cab facing to the left, decoder pin one is the pin on the far side  (the locomotive drivers side).

FVM DCC 651 decoder and frame
Each decoder has a marking or other way to denote pin 1.  The Soundtraxx decoder has a silver mark on the plug showing pin 1. 
The pointer in the picture is at pin one of the Soundtraxx decoder.

FVM GEVO decoder installed pointer to pin1
Remove the factory DC jumper plug from the socket at the rear of the light board. 
Once you have identified pin 1 on the decoder align the pins with the light board socket and insert the decoder. 
It is good practice to visually inspect the decoder and ensure that all the pins are correctly inserted. 

FVM GEVO Showin motor contact points
Ensure that the motor contacts have not been dislodged by inspecting the 2 contact points on either side of the frame as shown by the pointers in this picture.  The motor contacts should be tucked under the light board contacts.

FVM DCC 651 Decoder insulating tape
It is good practice to retain the light board with some tape as shown in the picture.  We also add a small piece of tape under the
decoder to be on the safe side.
Replace the shell and you are ready to run your locomotive.