I am extremely new to model railroading. I bought my first train about a month ago. A Bachmann H O Christmas train along with some other cars. The outfit is preowned but in great condition. I had a lot of trouble getting my engine and tender to run consistently. I found that I had quite a few issues with the E-Z track but when I finally got the track connected properly, the engine and tender ran very well for 6-8 days. The variable speed controller worked well until just the last day of so. Now when I turn on the controller very slightly, the engine spins it's wheels and is running wide open instantly. Now my limited ability told me I needed to ask someone with experience what to do next. I have no clue and I tried looking it up on the internet but didn't find a solution. I am a retired factory electrician so you would assume I could figure it out. Well I guess that is why I am typing this message here. I would appreciate any help anyone can give. It took me two days to figure how the send a message on the forum. I want to add that turning the controller on at the very minimum the track voltage is 15.69 volts. Almost tells my the controller is messed up?????