Assuming you mean two conductors... you could always check the resistance across a hinge from one part to the other; oil it, work in the oil and see if it sill conducts; then if it works use one as positive and the other as negative. Not 120VAC, please!
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
