Foot pedal testing

Can someone give me the ohm meter reading the foot pedal that comes with a 256 pp should put out. I believe mine has shat the bed. I was welding a patch on an aluminum boat this weekend and had some serious issues. It was all over the place...most of the times it would start fine then the amperage would fizzle down to nothing. Some times it wouldnt even start. These little things are starting to really pizz me off. Really embarrassing when a guy comes to get a simple repair done, is standing there watching me and I cant lay a decent bead to save my life!