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11-06-2017, 11:16 PM
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#1 |
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Registered User
Join Date: Jun 2014
Location: upstate sc
Posts: 2,095
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Help !!! What does this firewall wire go to
I've searched and can't find d the answer. If I had to guess I'd say amp gauge since it's a 10-12 gauge wire. Thanks for any insight truck is a 72 super with 402 and t400 trans
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11-06-2017, 11:22 PM
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#2 |
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Senior Member
 
Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Help !!! What does this firewall wire go to
Could that possibly be the electronic kickdown for the THM400? My 350/350 72's don't have that wire...Can you trace it under the dash?
__________________
Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property"  "Be American, Buy American" 
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11-06-2017, 11:26 PM
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#3 |
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Registered User
Join Date: Jun 2014
Location: upstate sc
Posts: 2,095
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Re: Help !!! What does this firewall wire go to
400 kick down is orange wire by distributor
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11-06-2017, 11:30 PM
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#4 |
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Registered User
Join Date: Jan 2014
Location: Mt.Sterling, KY
Posts: 673
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Re: Help !!! What does this firewall wire go to
Does it have factory tach or auxiliary battery setup? My trucks with factory tach dash has the wire coming through firewall like that. I believe my truck with auxiliary battery also has a wire like that. I will have to double check it.
__________________
Michael 
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11-06-2017, 11:34 PM
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#5 |
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Registered User
Join Date: Jun 2014
Location: upstate sc
Posts: 2,095
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Re: Help !!! What does this firewall wire go to
No tach or auxiliary battery
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11-06-2017, 11:42 PM
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#6 |
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Registered User
Join Date: Jan 2014
Location: Mt.Sterling, KY
Posts: 673
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Re: Help !!! What does this firewall wire go to
Any special options listed on SPID that require wiring?
__________________
Michael
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11-06-2017, 11:54 PM
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#7 |
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Senior Member
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,875
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Re: Help !!! What does this firewall wire go to
Does it go to a relay above the horn relay? If so, it's part of the TCS, and you can eliminate it. Mine comes through the firewall in the same place, and it took me a while to identify it.
__________________
I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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11-07-2017, 12:23 AM
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#8 | |
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Senior Member
Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Help !!! What does this firewall wire go to
Quote:
__________________
Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"
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11-07-2017, 12:45 AM
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#9 |
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Registered User
Join Date: Jan 2009
Location: San Antonio, Texas
Posts: 1,374
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Re: Help !!! What does this firewall wire go to
I have a wiring harness on my 72 in that same spot, but it has several wires in it, including the TCS wire and some others.
__________________
1972 C10 LWB, 350/350 Deconstruction began 5/2009, mostly completed restoration, 5/2017 |
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11-07-2017, 02:33 AM
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#10 | |
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Senior Member
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,189
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Re: Help !!! What does this firewall wire go to
Quote:
__________________
Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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11-08-2017, 01:37 AM
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#11 |
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Registered User
Join Date: Jul 2010
Location: Vista Ca.
Posts: 2,405
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Re: Help !!! What does this firewall wire go to
I've seen the TH400 kickdown wire on pre 71's in that location, or close to it.
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11-08-2017, 09:32 AM
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#12 |
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Registered User
Join Date: Aug 2013
Location: Atlanta, GA
Posts: 702
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Re: Help !!! What does this firewall wire go to
The wire I have coming through at that location is for the gas gauge switch for the NL2 optioned auxiliary fuel tank.
__________________
1968 C10 292/3 spd - sold 1969 K10 350/3 spd/205 - sold 1971 K5 350/4 spd/ 205 - sold 1970 K20 350/350/205 - sold 1969 K20 396/400/205 - work in process |
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11-08-2017, 10:19 AM
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#13 | |
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All about them K’s
 
Join Date: Jun 2014
Location: Farmington, New Mexico
Posts: 6,322
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Re: Help !!! What does this firewall wire go to
Quote:
__________________
Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 315/75/16's ‘87 IROC-Z all original 50K mile survivor TPI 305 IROC Blue ‘10 Camaro 2SS/RS Aqua Blue Metallic #93 -version 2.0 
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