I was given a very gently used Bachmann Big Hauler by a friend since I have a young child and his have out grown the idea of trains. 

The problem is I have the track, the train, the power pack but I don't have anything like what I'm accustomed to with my Lionel O scale stuck to connect the power unit to the track itself.  So I think I am missing a piece, am I?  I can't image you are just supposed to run the wires directly to the track are you?

Thanks for any direction I can get please!
Thanks,
Stan