The kickdown and TCS wires going to the trans should be totally sparate, they were never connected in any way (although they are probably in the same harness). Turbo 400's with TCS had two connectors on the side of the trans, one for kickdown and one for TCS. If yours only has one, either it's not the original trans, the car didn't have TCS, or someone changed the connector. Make sure the kickdown wire is connected to the right one. You should know which one it is if you can hear a "click" like you said. The TCS connector is "ground seeking" and gets grounded when the trans is in third gear. This lets the TCS solenoid pass vacuum to the vacuum advance canister only in third gear. As was said before, the kickdown connector should only get power at WOT. If there's no power, then something is wrong with the connection at the other end. Look at a wiring diagram for your car and see if you can find where it hooks to the cowl induction wiring. If the cowl door works, then there has to be a wire that only gets power at WOT. My guess would be a broken or disconnected wire going to the trans.
[This message has been edited by TurboJet396 (edited 07-19-2000).]