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The most important thing when installing a DCC decoder is to ensure that you completely isolate the motor from the wheel pickups, elsewise you'll fry your decoder.

Whilst I'm not familiar with this particular locomotive, one of the key things to check when fitting a decoder to older locomotives is that they have sufficient capacity to cope with the stall current of the motor. I notice that TTS decoders are listed as 800mA continuous/1A peak. Based on some motors I have of similar age these draw ~1.5A when stalled, which would again fry the decoder...!

Do you have a multimeter available? - You would be able to use this to both measure whether there is any continuity between the motor and pickups, and also the stall current of the motor @12V.

Regards,

Cameron.
 
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