I helped someone troubleshoot a Lionel Trainmaster ZW transformer this week, because my Lionel ZW transformer had exactly the same problem. It seems like it’s pretty common, so maybe others have the problem too.
The Lionel ZW, as you may know, has four pairs of posts on the back for power. You can use it to run four trains, but what many people do is use the inner posts to power accessories and fine-tune the voltage output. The problem with my ZW was that one of the pairs of posts didn’t work. Sometimes two of them might not work.
Here’s a slick trick to try, and if it works, the fix is super cheap and easy and doesn’t require you to open it up. Read more




