It is the same wiring diagram that is supplied with all of the controllers. I have several copies in fact, the 668, 668-401, 668-601, 668-430.....I even have a technician's furnace installation manual that also explains in a little more detail how to wire the 668 series of controllers. The only difference between the one supplied by White-Rodgers and the Tech manual is that the Tech manual shows the wire colors too. Except...I don't have any yellow wires. I've got, coming from the high-limit thermostat a blue, red and black in the controller junction box I have two black coming from the ignition transformer, one black and white wire from the motor. On the controller itself I have one white one black and one orange like in the instructions.
In fact. My blower motor and fan/limit switch go into a separate junction box.
Basically, if I follow the diagram in the installation manual for a Lo-Boy furnace which is what I have then this is how it should look. The color of the wires in the picture are exactly what I'm working with on my furnace. Most of the wires are black. Which, I don't understand. Perhaps, what I should do is buy some BX and re-run the wires from the blower motor to the junction box. Maybe this wouldn't be so frickin' confusing then.http://img85.imageshack.us/img85/2206/m ... wiring.png