I bought theses two-post buttons SPST from radioshack to replace my start button. It has two posts. My 74' 750 has only the green/red and yellow/red wires. With the power on, the starter is turning without pushing the button. If i push the putton it seems to stop it. and if I disconnect the wires from the switch the starter doesnt spin unless putting them together. I'm guessing the button is junk maybe to much amperage for it? anything I'm overlooking?