Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

6v is correct. 

Not sure about the amperage.

Make sure the wiring is not exposed and touching any of the metal (on the bottom).

I have had this problem in the past.

The contacts need to be super clean and oil and dirt free.

Unfortunately, many times the magnetism is so weak that they won't operate and/or the coil is bad.

Good luck!