1970 Chevy TH400 kickdown
 

The trans kickdown on my 454 with TH400 does not work. I removed the switch at the accelerator pedal and tested it with my meter and there is continuity when sliding the switch. I looked at my wiring diagram and did not find this switch (or the switch in the trans). The accelerator switch is purple w/black and black wires. The switch in the trans is orange and a black wire.

Any help with exactly how this is supposed to work would be apprecited.