Hi
Just purchased a Airco Heliarc 300 probably about 25 years old. I got a foot control pedal with it. One plug has 2 prongs where it plugs into welder and it turns on the high frenquency start ok. The problem I have is the other plug has 4 prongs and the female recpticale on the welder has 3. Does anyone know how to wire a 3 prong male plug on the foot
pedal cord ? Which color wire goes where on male plug? Thanks for any info.