Unkown connecter - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71gmcC15 · 03-25-2018, 09:04 PM

I have 3 wirs running along my driver side intake of my 71 gmc c15. Non AC and they are not pluged into any thing. I tryed to trace them back but go behide the motor and Ts into more wires any one know what its for. The wire colores are plain brown, brown with a white strip, and blue ( maby green)

71gmcC15 · 03-25-2018, 09:05 PM

Wires

71gmcC15 · 03-25-2018, 09:06 PM

End of conneter

Redneck Rydes · 03-25-2018, 10:27 PM

Kinda looks like a alternater wire.

Acorn · 03-25-2018, 10:35 PM

Alt was my first thought too.
See if this helps http://67-72chevytrucks.com/vboard/s...d.php?t=185856

71gmcC15 · 03-25-2018, 11:52 PM

Thanks for the fast replies. I thought that to but the alt is hooked up and works. And its too short to reach. Could it be for the orignal choke of a 2bb carb. I know they usealy only have one wire. Not shure what the choke wire even looks like for a 2bb . Mines not hooked up and swiched to a qjet.

**VetteVet** · 03-26-2018, 03:43 AM

Your description sure sounds like the pathetic emissions control the 70 and 71 models had that was called the transmission controlled spark. The plug with the two browns and the blue wire were plugged into a vacuum switch on the carburetor that would retard the timing
when engine vacuum was low.
Most of the trucks from that era had these systems disconnected because they did nothing and removing them never hurt anything.

You should have a couple of relays on the firewall or over the fuse box with wires running to them as well.
if you do a search on the forums for Transmission controlled spark, you should get more information. VV

71gmcC15 · 03-26-2018, 08:25 AM

Quote:

Originally Posted by VetteVet

Your description sure sounds like the pathetic emissions control the 70 and 71 models had that was called the transmission controlled spark. The plug with the two browns and the blue wire were plugged into a vacuum switch on the carburetor that would retard the timing
when engine vacuum was low.
Most of the trucks from that era had these systems disconnected because they did nothing and removing them never hurt anything.

You should have a couple of relays on the firewall or over the fuse box with wires running to them as well.
if you do a search on the forums for Transmission controlled spark, you should get more information. VV

Thanks. That helped out alote. I will just leve the wires alone then. Its simpler that way. I did not know they had somthing like that. Good to know.

71gmcC15 · 03-26-2018, 12:48 PM

time to play round two.
i dont have a photo of it yet i will get one soon but on the right side their is a single light green wire with a connection the same as the temp sender (dark green). i think it could be the original choke wire but it does not work with my qjet. the carb is off of an 80s chevy. hense the reason its the choke not hooked up. any one have an idea on what it could be.

**Steeveedee** · 03-26-2018, 01:12 PM

'71 did not have an electric choke. Is it a two-prong jack, with the other wire color as black? If so, it would be for the AC compressor.

71gmcC15 · 03-26-2018, 02:31 PM

Quote:

Originally Posted by Steeveedee

'71 did not have an electric choke. Is it a two-prong jack, with the other wire color as black? If so, it would be for the AC compressor.

thanks for the replie Single prong female end only one wire, light green. No electric choke? did it have a thermal choke then? i do not have AC so that cant be it

03-25-2018, 09:04 PM	#1
71gmcC15 Registered User Join Date: Feb 2018 Location: Doland SD Posts: 836	Unkown connecter I have 3 wirs running along my driver side intake of my 71 gmc c15. Non AC and they are not pluged into any thing. I tryed to trace them back but go behide the motor and Ts into more wires any one know what its for. The wire colores are plain brown, brown with a white strip, and blue ( maby green) Attached Images __________________ ( second times the charm) 71 gmc c15 307 sbc 373 rear gears positrac sm 465 trans. ( not listed on spid but is original ) 94 chevy k1500 350 tbi 373 rear gears 4l60e one wheel peel. Gutless 07 gmc sierra classic rcsb 4.3 lt 5 speed w/t 04 chevy Silverado 1500 ext cab 5.3 4l60e. 81 chevy Scottsdale k10 muncie sm465 Np208 10 bolt 8.2 ( Old Green)

03-25-2018, 09:05 PM	#2
71gmcC15 Registered User Join Date: Feb 2018 Location: Doland SD Posts: 836	Re: Unkown connecter Wires Attached Images __________________ ( second times the charm) 71 gmc c15 307 sbc 373 rear gears positrac sm 465 trans. ( not listed on spid but is original ) 94 chevy k1500 350 tbi 373 rear gears 4l60e one wheel peel. Gutless 07 gmc sierra classic rcsb 4.3 lt 5 speed w/t 04 chevy Silverado 1500 ext cab 5.3 4l60e. 81 chevy Scottsdale k10 muncie sm465 Np208 10 bolt 8.2 ( Old Green)

03-25-2018, 09:06 PM	#3
71gmcC15 Registered User Join Date: Feb 2018 Location: Doland SD Posts: 836	Re: Unkown connecter End of conneter Attached Images __________________ ( second times the charm) 71 gmc c15 307 sbc 373 rear gears positrac sm 465 trans. ( not listed on spid but is original ) 94 chevy k1500 350 tbi 373 rear gears 4l60e one wheel peel. Gutless 07 gmc sierra classic rcsb 4.3 lt 5 speed w/t 04 chevy Silverado 1500 ext cab 5.3 4l60e. 81 chevy Scottsdale k10 muncie sm465 Np208 10 bolt 8.2 ( Old Green)

03-25-2018, 10:27 PM	#4
Redneck Rydes Registered User Join Date: Feb 2016 Location: Trenton,Ontario & South Carolina Posts: 755	Re: Unkown connecter Kinda looks like a alternater wire.

03-25-2018, 10:35 PM	#5
Acorn Registered User Join Date: Jul 2013 Location: Winnsboro Texas Posts: 367	Re: Unkown connecter Alt was my first thought too. See if this helps http://67-72chevytrucks.com/vboard/s...d.php?t=185856 __________________ The bitterness of poor quality lingers long after the sweetness of a low price is forgotten.

03-25-2018, 11:52 PM	#6
71gmcC15 Registered User Join Date: Feb 2018 Location: Doland SD Posts: 836	Re: Unkown connecter Thanks for the fast replies. I thought that to but the alt is hooked up and works. And its too short to reach. Could it be for the orignal choke of a 2bb carb. I know they usealy only have one wire. Not shure what the choke wire even looks like for a 2bb . Mines not hooked up and swiched to a qjet. __________________ ( second times the charm) 71 gmc c15 307 sbc 373 rear gears positrac sm 465 trans. ( not listed on spid but is original ) 94 chevy k1500 350 tbi 373 rear gears 4l60e one wheel peel. Gutless 07 gmc sierra classic rcsb 4.3 lt 5 speed w/t 04 chevy Silverado 1500 ext cab 5.3 4l60e. 81 chevy Scottsdale k10 muncie sm465 Np208 10 bolt 8.2 ( Old Green)

03-26-2018, 03:43 AM	#7
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,709	Re: Unkown connecter Your description sure sounds like the pathetic emissions control the 70 and 71 models had that was called the transmission controlled spark. The plug with the two browns and the blue wire were plugged into a vacuum switch on the carburetor that would retard the timing when engine vacuum was low. Most of the trucks from that era had these systems disconnected because they did nothing and removing them never hurt anything. You should have a couple of relays on the firewall or over the fuse box with wires running to them as well. if you do a search on the forums for Transmission controlled spark, you should get more information. VV __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

03-26-2018, 12:48 PM	#9
71gmcC15 Registered User Join Date: Feb 2018 Location: Doland SD Posts: 836	Re: Unkown connecter time to play round two. i dont have a photo of it yet i will get one soon but on the right side their is a single light green wire with a connection the same as the temp sender (dark green). i think it could be the original choke wire but it does not work with my qjet. the carb is off of an 80s chevy. hense the reason its the choke not hooked up. any one have an idea on what it could be. __________________ ( second times the charm) 71 gmc c15 307 sbc 373 rear gears positrac sm 465 trans. ( not listed on spid but is original ) 94 chevy k1500 350 tbi 373 rear gears 4l60e one wheel peel. Gutless 07 gmc sierra classic rcsb 4.3 lt 5 speed w/t 04 chevy Silverado 1500 ext cab 5.3 4l60e. 81 chevy Scottsdale k10 muncie sm465 Np208 10 bolt 8.2 ( Old Green)

03-26-2018, 01:12 PM	#10
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,348	Re: Unkown connecter '71 did not have an electric choke. Is it a two-prong jack, with the other wire color as black? If so, it would be for the AC compressor. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA



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