Two of my 5 MTH engines can not be added to my list of engines on my controller. I have no problem running my three other MTH engines (two of which are proto sound 3, and the other proto 2). The two engines that can not be added are proto sound 2. I have not run these two engines in the past 6 months; but had no problem adding them to the system in the past and running them.
What could be the problem?
Trainrat