Got the K-4 running  but not the 4-8-2.  

These are both steam engines I've mounted the decoders in and the decoder chip just won't stay in the receptacle.   I'm able to run some old analog engines on #10 and they run but so far the DCC engines (which are much newer than my old school analog engines) won't run.  I'm not sure why the K4 pacific won't run.  Any ideas?

Thanks!  I'll try the phone tape as it sounds like caulk would be a hassle when it came to future repairs / changes.

I'm new to DCC.  I finally figured out with the help of this forum where you actually plug in the decoders on my Bachmann 4-8-2 Light Mountain and K4 Pacific.  I have Bachmann's DCC system and tried to get some trains running.  Neither of my Bachmann locos will run.    I put some of my old analog locos on and got them to run by turning on #10 for the analog locos on my dcc controller.  I opened up the tender on the Mountain and the decoder had come loose.  Is it okay to secure that with electrical tape?  I'm not sure what's going on with the K-4 yet but I'll try to get the Mountain going first.  BTW, I'm using the basic Bachmann 8 pin decoders.  Thanks in advance!

Rich and Jonathan,

Just pulled the thing with the two blobs of solder and now everything is abundantly clear!     Not very intuitive of Bachmann.  Thanks for all your help.

The top picture in reply #6 is exactly what it looks like.  I'll try and get on photo bucket tonight. and upload a picture.  Thanks for your help.

This doesn't have sound.  I looked and I don't see a socket where this would plug in.  What would said socket look like?  Thanks

I have a DCC ready Bachmann K4 84013 and am trying to figure out where to install the 8 pin Bachmann 44915 decoder in this loco.  I took off the tender top and see some circuit boards but no obvious place to plug in the decoder.  Do I have to open up the loco?