When you say 'wrong key switch', do you mean the ignition switch? The one I installed was ordered off of Sears Direct site and was the result of searching for ignition switch for my model number.
I have a MTD 13AF608G062 yard machine that when I turned the key, there were no dash lights coming up or click. So I first replaced the ignition switch (925-1741). Then when I turned the key, I got a minor light that came on the dash, so that was progress.
The next thing to replace was the...