Question on SC-2

Green light indicates it's getting power.  What about the red communications light?  It should blink whenever it detects a command directed to a switch or accessory connected to it.  Are you using the wall wart power supply, and auxiliary power supply or are you trying to pull power from the track?  The SC-2's antenna is it's weakest link.  The antenna is small and the wiring to it can be poorly done so you may be getting poor reception.

If you're using the wall wart, try using track power for the unit.  Make SURE the ground (top aux power terminal) is connected to the outside rail for the wall wart or track power.  If you still experience issues, try running a ground wire from a 3 prong plug near the SC-2 and see if that changes it.

As Chuck says, the red light signals that it's getting the commands.

I have 4 under my table. I installed one on a table leg about 18 inches off the floor and it worked perfectly. I installed one directly underneath it and it would not function until I ran a ground wire from the wall outlet cover screw. I ran the wire right under the back of the SC2 and it worked great. I have 2 other SC2's on another table leg about 8 feet away. The ground wire trick did not help too much, but they work great as long as I have some loose wire draped over the top of them. ( I found this by accident as I was re-routing some wires. ) This seems to improve the signal to the internal antenna.

Of course, there's always the option of increasing the size of the internal antenna, though I've never had to do that.

Sorry, I meant the red light blinks when I send a command to it.  The green light stays on.  It worked originally with power direct from transformer post.  Then when it failed, I switched to wall wart.  Neither one even clicks anymore.

Ok, So the green lite is on when the wall wart is plugged in. You can't get the red lite to come on at all ? Did you move the SC2 at any point? Is it in the exact same location that it was the last time it worked?

Well, with two of them failing, I'd be looking for a common cause.  Obviously, something has changed.

The green light is on and the red light blinks when I send it a command from the CAB-1, but it doesn't click when I do like it used to and nothing works.  I am only talking about this one, not two of them.

Something may have failed, I don't recall ever seeing one that appears to get the commands not responding.  I did have one that cooked a transistor in a couple of channels and they didn't work.  Did you try all the channels to see if it's just one?

How do I do that?

Just try to address each of the channels with a command and see if you hear the relay clicking.  Maybe we're just looking at a single channel failure.  The fact that you have a red light seems to indicate it's seeing the commands.

nope, no clicking on any of the accessory numbered buttons

So, you see a red light when you address the SC-2, but if you address outside it's range, the red light doesn't blink, right?  In addition, none of the relays activate when you select them and attempt to change their state, right?  You've also reprogrammed it, right?

If all of that is true, it sounds like something failed internally.