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  #1  
Old 06-24-2026, 04:24 PM
oldog97 oldog97 is offline
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Join Date: Feb 2021
Location: Elk Grove Village,Illinois
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Default Under Dash Wiring Mystery

Greetings everyone!
So, I just recently finished my 16 month long complete rebuild/restoration of the 69 GTO that I picked up back in Jan of 2025. Now, just a couple little things to get straightened out after her shakedown.
No kickdown happening on the TH400. FYI, new sound deadening mat and new carpeting along with new carpeted floor mats. First thing I noticed was the carpeted mat preventing pedal from going to the floor, so I cut it to clear the pedal. I replaced the switch and I have power going into it and power coming out when depressed. No power at trans. I dis-connected the wire/boot off the trans and ran a hot jumper to the terminal and it clicks fine, so I know there's a break in the wire somewhere between the switch & the trans. When looking under the dash, the plug going into the switch has a green & a pink wire. These wires go a loom with another pink wire, a black wire, a couple orange wires in it. One of the orange wires has been cut and is not connected to anything. Anybody have an idea where this should go? I have the large laminated wiring layout that I bought for the car, but it is no help.
Thank You All!
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  #2  
Old 06-24-2026, 06:47 PM
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OG68 OG68 is offline
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Green / Pink wire pair goes to the Back up light switch mounted on top of the steering column. You should have a Pink with Black tracer and and Orange wire plugged into the kick down switch,

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1968 GTO (Thanks Mom)
2006 Silverado
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2024 Cadillac LYRIQ

  #3  
Old 06-25-2026, 08:58 AM
oldog97 oldog97 is offline
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I gotta run to the chiropractor this morning, when I get back, I;m going to pull the drivers seat out again so I can get under there a little easier and try to find out what is what. Try to see what is hooked up to the B/U lights right now. I'm thinking, they must have the same plugs on them in order for them to be interchangeable.???

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