TH400 kickdown - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

 
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post #1 of 9 (permalink) Old Jul 9th, 00, 3:05 PM Thread Starter
 
Join Date: Mar 1999
Location: des moines , ia usa
Posts: 11
i have a 72 chevelle with the functional cowl hood and a TH400 trans. i know the switch that operates the inner cowl door is the same switch used to run the kick down, i did a search on this site but no luck in finding out how to wire it. there was a post that said that the kick down is wired into one of the pigtails on the cowl induction harness, however both of these pigtails are "hot" with the key on. the kickdown switch has no effect on the voltage at the connection. my question is, is the detent switch at the trans supposed to receive 12 volts any time the key is on, and since the switch has no effect on the voltage at the pigtails how does the trans know what position the throttle is in, and when to downshift? sorry for the long post. thanks in advance

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[This message has been edited by ProSt72ss (edited 07-13-2000).]
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post #2 of 9 (permalink) Old Jul 13th, 00, 12:01 AM Thread Starter
 
Join Date: Mar 1999
Location: des moines , ia usa
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hi all,
its been a few days and i havent gotten any responses yet, so i must have stumped everyone. seriously there must be someone out there that knows the answer to this problem. again thanks in advance.
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post #3 of 9 (permalink) Old Jul 13th, 00, 7:57 AM
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Join Date: Aug 1998
Location: Dallas, Tx, USA
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Sorry I don't have a wiring diagram for cowl induction. I will assume you are correct in that the switch on the go pedal operates both. If that is true then you should have +12v on one side of the switch and the other side should connect to the kickdown terminal on the tranny and the cowl induction. If the switch is bad (shorted) you would see +12 on both terminals all the time. You should have +12v to the tranny/cowl induction ONLY when the throttle is wide open. Make sure you have the correct switch. I think the brake switch is similar looking but opposite acting. THere are two terminals on the tranny, one is for kickdown and the other is for TCS.

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Steve Strasemeier (70SS 396, Fathom Blue/White Stripes)


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post #4 of 9 (permalink) Old Jul 13th, 00, 3:09 PM
cb
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Location: Gilbert,AZ,USA
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The switch should close at or near WOT and be open the rest of the time. Take both wires off and check the switch function. If the switch is OK, then you have a wire connected wrong somewhere between the sitch and the trans or the switch and the cowl door. The switch it most likely wrong or broke.
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post #5 of 9 (permalink) Old Jul 13th, 00, 5:58 PM Thread Starter
 
Join Date: Mar 1999
Location: des moines , ia usa
Posts: 11
thanks for the responses. just to clarify my situation, the switch is wired per the wiring diagram. it gets its power from the spade terminals on the fuse panel (acc & ignition). i am assuming the switch is functioning because the cowl induction system works properly. however the t.c.s. system has been removed long ago. if it were there every thing would just plug in and work. (the harness is still there and the trans switch terminal is attached to the switch on the trans.) if i put 12v directly to the trans switch thru the harness i can hear the switch click. since all of the t.c.s parts are gone, i need to know how to wire the cowl induction harness to the t.c.s harness so the kickdown will function (although i dont really need it with a big block) i would still like for it to work. again thanks for the replies, this is the best site on the net. thanks Al for providing this forum for us chevelle fans.

[This message has been edited by ProSt72ss (edited 07-13-2000).]

[This message has been edited by ProSt72ss (edited 07-13-2000).]
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post #6 of 9 (permalink) Old Jul 17th, 00, 9:28 PM Thread Starter
 
Join Date: Mar 1999
Location: des moines , ia usa
Posts: 11
hi guys,
i still havent gotten this figured out. there must be someone out there who has/had the same situation. sorry to be impatient, but i really want the trans to function as designed. thanks again.
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post #7 of 9 (permalink) Old Jul 19th, 00, 4:03 PM
 
Join Date: Jul 2000
Location: Sonoma, CA
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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).]
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post #8 of 9 (permalink) Old Jul 19th, 00, 7:37 PM Thread Starter
 
Join Date: Mar 1999
Location: des moines , ia usa
Posts: 11
turbojet, thanks for the reply. there are two terminals on the trans, and the trans is hooked up at the trans end of the harness. the other end is not hooked up and the wiring diagrams are not clear. compounding my problem are the missing tcs system and the original distributer (now an HEI) one of the terminals on the CI relay operates the inner door at WOT, however there isnt a pigtail to attach the other end of the trans harness to. any suggestions would be greatly appreciated. thanks all.

[This message has been edited by ProSt72ss (edited 07-19-2000).]
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post #9 of 9 (permalink) Old Aug 10th, 00, 9:36 PM Thread Starter
 
Join Date: Mar 1999
Location: des moines , ia usa
Posts: 11
hi all,
i still havent gotten this figured out . some one out there must have had the same situation and can help me solve this. sorry to be a pain
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