I would like to power my elec trac snow blower attachment using an accessory 36 volt pack. The snow thrower has a large 3 prong plug.  To wire a new receptacle for this plug, are all 3 lines to the receptacle coming off the positive terminal of my battery pack and I run a ground from the negative terminal of the pack to the frame of the snow blower? 

Sorry for my lack of knowledge

rick