NYNH&H said:
Not sure why you would have to solder if you have the right decoder.
EDIT: I use a DH123D. For a Genesis, if it has separate functions for the ditch lights, then you would want a DH163D.
NYNH&H, you answered your own question

. "IF" you choose a certain decoder

. thing about it is, NOT everyone wants a DH123D, or a DH163D decoder in there engine, i most certainly wouldn't. Myself, I choose LokSound, or MRC Brilliance sound decoders to put in my engines, i STRONGLY feel BOTH of those are FAR SUPERIOR to the DH123D or DH163D, even if you disconnected the speaker and ran them silent. But hey, thats just MY OPINION

. OTHERS, might prefer an NCE decoder, or whatever, THIS IS WHY i gave the install instructions that i did.
And i want to add, NOT ALL Digitrax decoders 9 pin plugs fits the 9 pin socket on the Athearn circuit boards

. my dad bought a Digitrax 9 pin decoder he wanted me to put in his Athearn AMD-103, ended up the Digitrax 9 pin decoder was SMALLER then the Athearn socket

. i 86'ed the digitrax decoder and installed one of my spare MRC Brilliance decoders in it:thumb:.
BOTTOM LINE;
IF the Digitrax DH123D or DH163D are the decoders for you, it sounds like they ARE plug and play, and like NYNH&H said, should be an easy install:thumb:. (i know for a fact that on the DH123D, you better MAKE SURE IT HAS THE "D" ON THE END OF IT, because the DH123 WILL NOT plug into the Athearn 9 pin socket, its to small).
IF you prefer a decoder or sound decoder that IS NOT specifically meant for the Athearn "DCC ready" engines, the way i described how to install the decoder or sound decoder would be the easiest way to do it:thumb:.
FINAL NOTE: NO 8 PIN PLUG WILL FIT TIGHT IN ATEARN'S 8 PIN SOCKET ON THERE "DCC READY" CIRCUIT BOARDS! it says IN ATHEARNS INSTRUCTIONS to "solder" that type of plug in

...yea, good luck on that one

.

-Deano