Christy,
Sorry about giving you the wrong wiring diagram, I've never worked on a Pfaff and didn't know they were wired different.
If your foot controller is a carbon type resistance unit it's probably suffering from a build up of carbon. That can cause a fire in the controler, so don't use it.
Here's a blog done by Arcaic Arcane about that:
{
http://www.archaicarcane.com/what-a-pile-of/ }
Joe