Need some help. I just purchased a No. 8 Lionel Standard Gauge engine that was not wired. I wired it to a forward/ reverse switch and can't get it to run. There is a 5th wire on the top of the motor that looks like it attaches to a breaker point devise. I am only just getting into model trains and have worked on a couple of locomotors but none had the 5th wire. Can anyone help me figure out how to wire this? I would greatly appreciate it. I would like to get the engine running for my grandkids.