What is this Plug? Pics inside! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

TacBlade · 09-18-2013, 07:11 PM

Can anyone tell me what this is? I have no wires running to it? It is on the passenger side firewall?

mmiddle · 09-18-2013, 07:29 PM

Compressor relay

TacBlade · 09-18-2013, 08:09 PM

Compressor relay? So what was it used for on the original equipment? I have a new 383 installed now.

71K20chevy · 09-18-2013, 08:14 PM

It was for the A/C compressor.

Andy4639 · 09-18-2013, 08:18 PM

Unless someone moved it to there it's not for the AC that I know of. The AC relay is inside on my 71 cab.
It maybe a relay for something at one time though.

TacBlade · 09-18-2013, 08:43 PM

If its for the AC Compressor, Should it be hooked up to it? I do have an updated Compressor that was put on, along with the new motor?

PanelDeland · 09-18-2013, 08:51 PM

I believe that's the relay that keeps it from Dieseling.I can't remember what it's actually called.
Maybe anti-dieseling relay?

Acorn · 09-18-2013, 09:10 PM

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Not sure if its the same relay but I have one on my non a/c '70 It goes to a vac solenoid on the intake. The vac lines go to the vac advance on the distributor. I figured it was some kind of California emissions or something?

71 super · 09-18-2013, 11:34 PM

It is not relay for a/c it is a relay for tcs ( transmission controlled spark) it was connected to trans and vac advance and pulled timing out when truck sent into high gear. It was early emission device and had a vac solenoid that was electric and vac. Operated. On intake.
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DkOlive72 · 09-19-2013, 01:47 AM

Quote:

Originally Posted by 71 super

It is not relay for a/c it is a relay for tcs ( transmission controlled spark) it was connected to trans and vac advance and pulled timing out when truck sent into high gear. It was early emission device and had a vac solenoid that was electric and vac. Operated. On intake.
Posted via Mobile Device

I'm with 72 super on this me. Pretty sure it is the TCS relay (having recently done a fair bit of research on the the TCS). You can search the forum for TCS and yo should find similar pictures of a relay in the same spot.
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TacBlade · 09-19-2013, 06:13 AM

Thanks Guys!!! Its getting removed and thrown in the trash!!!

09-18-2013, 07:11 PM	#1
TacBlade Registered User Join Date: Apr 2011 Location: Rapid City, SD Posts: 104	What is this Plug? Pics inside! Can anyone tell me what this is? I have no wires running to it? It is on the passenger side firewall? Attached Images

09-18-2013, 07:29 PM	#2
mmiddle Registered User Join Date: Jul 2013 Location: Forestburg, Texas Posts: 659	Re: What is this Plug? Pics inside! Compressor relay __________________ Mark Jesus is the Way! 2003 2500HD CCLB Duramax/Ali (Clifford) 2014 2SS/RS black on black Camaro (Betty) 2006 Pontiac SOLSTICE silver/black (Lula-Bell) 1970 C/10 Short Wide (Peggy) 1964 C/10 Short Step (Hambone) RIP Jimmy Hamilton Thank you for the trucks

09-18-2013, 08:09 PM	#3
TacBlade Registered User Join Date: Apr 2011 Location: Rapid City, SD Posts: 104	Re: What is this Plug? Pics inside! Compressor relay? So what was it used for on the original equipment? I have a new 383 installed now.

09-18-2013, 08:14 PM	#4
71K20chevy Registered User Join Date: Jul 2012 Location: Ft Wayne Indiana Posts: 1,204	Re: What is this Plug? Pics inside! It was for the A/C compressor. __________________ 71 K20 64 GMC mud truck

09-18-2013, 08:18 PM	#5
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: What is this Plug? Pics inside! Unless someone moved it to there it's not for the AC that I know of. The AC relay is inside on my 71 cab. It maybe a relay for something at one time though. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

09-18-2013, 08:43 PM	#6
TacBlade Registered User Join Date: Apr 2011 Location: Rapid City, SD Posts: 104	Re: What is this Plug? Pics inside! If its for the AC Compressor, Should it be hooked up to it? I do have an updated Compressor that was put on, along with the new motor?

09-18-2013, 08:51 PM	#7
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,992	Re: What is this Plug? Pics inside! I believe that's the relay that keeps it from Dieseling.I can't remember what it's actually called. Maybe anti-dieseling relay? __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

09-18-2013, 09:10 PM	#8
Acorn Registered User Join Date: Jul 2013 Location: Winnsboro Texas Posts: 367	Re: What is this Plug? Pics inside! Not sure if its the same relay but I have one on my non a/c '70 It goes to a vac solenoid on the intake. The vac lines go to the vac advance on the distributor. I figured it was some kind of California emissions or something?

09-18-2013, 11:34 PM	#9
71 super Registered User Join Date: Sep 2005 Location: Canton North carolina Posts: 3,080	Re: What is this Plug? Pics inside! It is not relay for a/c it is a relay for tcs ( transmission controlled spark) it was connected to trans and vac advance and pulled timing out when truck sent into high gear. It was early emission device and had a vac solenoid that was electric and vac. Operated. On intake. Posted via Mobile Device __________________ 67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle

09-19-2013, 06:13 AM	#11
TacBlade Registered User Join Date: Apr 2011 Location: Rapid City, SD Posts: 104	Re: What is this Plug? Pics inside! Thanks Guys!!! Its getting removed and thrown in the trash!!!



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