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06-27-2012, 11:49 PM
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#1 |
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425hp409
 
Join Date: Oct 2008
Location: Prosper Texas
Posts: 841
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72 Wiring Problem
I am installing all new wiring harnesses in a 72 with AC and there is a harness coming out of a round plug to the left of the firewall harnesses that was not connected to anything. I don't have one like this in the new harnesses and wonder if I am going to need it. I am also installing a new engine, so don't have it installed yet to match all the wiring up until tomorrow. If some one has a truck that I can look at, I would appreciate the chance to do so. I am in Frisco.
Charles Haley Frisco Automotive 972-335-9823 Posted via Mobile Device
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Charles 68 SWB, Dad bought new, now 396 & factory ac 64 Impala SS, 409 425HP, 4 speed AC 64 Bel Air Wagon, 400 Small Block 57 Bel Air all original 283 w/Factory Air 77 GMC Sprint, 454/425HP 67 Olds 442, all original 90 ZR1 Corvette |
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06-28-2012, 07:06 AM
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#2 |
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72 GMC
Join Date: Feb 2008
Location: Wells, Maine
Posts: 534
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72 Wiring Problem
Not sure where you mean.
Take a look at this . . |
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06-28-2012, 07:43 AM
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#3 |
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Msgt USAF Ret
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,718
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Re: 72 Wiring Problem
Here are a few threads wit pictures. It might be this --Transmission controlled spark
http://www.google.com/custom?domains...D%3A1%3B&hl=en
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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06-28-2012, 08:26 AM
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#4 |
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Registered User
Join Date: Aug 2009
Location: Alden NY
Posts: 2,705
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Re: 72 Wiring Problem
The smaller round hole to the right and above the fuse block connector (as you are standing looking into the engine compartment) is for a light brown wire that goes to the gas gauge sender. The above diagram photo doesn't seem to show it. Also on the tunnel part of the firewall shown (again as you are facing it from the front of the truck) the uppermost hole on the slant is for the oil line, and the one underneath it for windshield washer tubing. The hole on the flat of the the tunnel near where the throttle cable exits is for the rear light harness.
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1961 C1 Corvette 1959 El Camino 350 TPI, 9" 4 w disc 69 Blazer K5 - sold July '20 2021 Durango RT 5.7 |
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06-29-2012, 08:50 AM
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#5 |
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Rottenwood Garage Member
Join Date: May 2009
Location: Marietta Ga
Posts: 74
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Re: 72 Wiring Problem
I have a similar harness on my '72 with AC. I think its there to run the AC idle circuit on the factory carb as well as the factory electric choke.
I'm not 100% sure as I yanked these items and did not pay attention to their function. Todd |
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06-29-2012, 09:01 AM
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#6 |
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Moderator
Join Date: Jul 2006
Location: Ozark, MO
Posts: 4,888
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Re: 72 Wiring Problem
Let me go out to my truck and check for you...
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'20 Silverado Trail Boss ~ '17 Tahoe ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '71 Cheyenne swb ~ '55 Pontiac Safari ~'50 3100 bagged ~ '80 Wife ~ Late model kids
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06-29-2012, 10:26 AM
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#7 |
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Registered User
Join Date: Aug 2009
Location: Alden NY
Posts: 2,705
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Re: 72 Wiring Problem
I have never seen a factory electric choke. I believe they were all divorced chokes with no wiring to them. 525409hp - can you take a photo of the plug?
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1961 C1 Corvette 1959 El Camino 350 TPI, 9" 4 w disc 69 Blazer K5 - sold July '20 2021 Durango RT 5.7 |
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06-29-2012, 10:34 AM
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#8 | |
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Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 1,108
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Re: 72 Wiring Problem
Quote:
 NoNeck
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2016 RAM Laramie HEMI 1966 Fairlane GT/A, 390/335 HP If it costs you a dollar to make a friend, KEEP THE DOLLAR. If it costs you a friend to make a dollar, KEEP THE FRIEND. |
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06-29-2012, 03:29 PM
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#9 |
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Rottenwood Garage Member
Join Date: May 2009
Location: Marietta Ga
Posts: 74
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Re: 72 Wiring Problem
Looks like TSC and associated wiring
see post at http://67-72chevytrucks.com/vboard/s...d.php?t=297960 All of these wires match up with what I unplugged on mine Todd |
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07-07-2012, 10:38 PM
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#10 |
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Registered User
Join Date: Mar 2011
Location: Brandon,Iowa
Posts: 391
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Re: 72 Wiring Problem
--------------------------------------------------------------------------------
The smaller round hole to the right and above the fuse block connector (as you are standing looking into the engine compartment) is for a light brown wire that goes to the gas gauge sender. On all 3 of my '72 trucks and the '71 parts truck the fuel gauge sender wire comes out of the top of the fuse panel under the dash, runs along the left sill plate ( along with the dome light and cargo light wires,) and then to the fuel tank sender. 2 are AC & automatic trucks, the other 2 are non-AC with manual trans, 3 C20's, 1 K20. I just went out and looked,, all 4 trucks have a plug in that hole . Don't know what wire you are referring to..... |
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