If anyone is still finding this question, i have done a lot of looking for this same answer. The problem is all of the manuals everyone refers to are for the k45ss. SS stands for solid state. The NON solid state mixer (ie: older) has a completely different wiring setup. For starters, it uses a micro switch attached to the speed control lever. Also the field and brushes are wired differently, the power cord attaches to the field wires inside the motor, not at the back of the mixer. The mixer also does not have the phase control that the newer solid state units use. This is why the wiring colors and amount of tabs to hook to on the new design speed control plate are different. I am still looking for a wiring diagram for the k45 with no luck. I have tried wiring the new plate in the same as the old one but the motor stutters at anything under full speed. I am not sure if the governor is sticking or what.
jls, October 2011