I got my new 2-6-6-2 and have two issues.

1 - The front light does not work.  I figure that something isn't plugged in correctly.  What do I take apart to check for a loose or unplugged wire?

2-  The tenders (BAC-89831) that I bought for it refuse to program.  I am using a Easy-DCC system.   Any suggestions?

3 - If I decide to replace the decoders in the tenders, what is the wiring color code?