After working on some smoke units I got a chance to mess with a horn on a FM diesel. I got it working and now I can use that information to work on my Burlington GP-9. To start the horn has to work with a D cell battery. This one didn't. The wire broke off. I do have a new one. It was bought...

I recently purchased a postwar Lionel GP7 engine. I had trouble getting the horn to work and found the battery does not reach the frame ground. What is wrong here? Notice that the battery cover makes the battery sit well away from the frame "terminal". I have temporarily grounded it with...