TMCC problems

You missed the most important part of the information, what command system are you using, the original TMCC BASE1/CAB1, the newer BASE1L/CAB1L, or the Legacy command system?  It's VERY unlikely that your transformer has anything to do with your signal issues.

Did you change anything on the layout before this issue started happening?  Have you tried the problem locomotives on another layout?

Thanks, I have the base 1L/Cab1L. I did not change anything but I had health issues and had not operated the trains for about 5 months. I did not try using another layout but I dealt with a train store in Lebanon, PA and I may give them a call. It is about 1.5 hour drive, but it may be the best method for me now.

90 minutes seems like a long drive, where exactly do you live?

I live in east prospect PA

Louis,

No. 1 is to check the Base's power supply where it's plugged into the wall outlet, or extension cord.  For best trouble free operation (no flickering headlights) this MUST be plugged into a properly grounded outlet.

If you use an extension cord make sure it is a 3-wire grounded one.

Unless you have a big layout, or one with multiple level track, these actions should be sufficient to solve most problems with flickering headlights.

Mike

Start by testing the ground connection of your house wiring.  Buy an outlet tester (aka receptacle tester) and determine that the outlet where your TMCC power brick (with the three prongs) is plugged is properly grounded.

Another key to signal strength and grounding.  Do not plug the command base into a surge protector as that may interfere with the signal strength.  An extension cord may be OK, but best to make sure you have a good connection by checking on the outlet and plugging the wall wart directly into the outlet.  If you have an older house (before the 1970s and 1980s in particular) your outlet may not be properly grounded if some people's experience is correct.