What is this electrical piece? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

clemsonteg · 11-26-2012, 10:43 PM

Does anyone know what the electrical connector circled in red is for? mine is charred like it shorted out at one time and the wire I assume is connected to it on the firewall block is melted as well. The truck seems to run fine so I don't think it is affecting anything, but it would be nice to know what it is and if it will cause problems in the future.

Andy4639 · 11-26-2012, 10:48 PM

It's to small for me to make out. Can you get it a little bigger? I don't think it's suppose to be mounted there either form factory anyway.

clemsonteg · 11-26-2012, 10:51 PM

This actually isn't a picture of my truck, but I have the same connector in the same spot, the only difference is my truck is non-ac

clemsonteg · 11-26-2012, 10:57 PM

Here is a picture of the piece on my truck

MikeyMan · 11-26-2012, 10:59 PM

That might be TCS wiring stuff.

Don't really need it, mines kinda balled up in the same area.

clemsonteg · 11-26-2012, 11:02 PM

Quote:

Originally Posted by MikeyMan

That might be TCS wiring stuff.

Don't really need it, mines kinda balled up in the same area.

Excuse my noobness, TCS?

MikeyMan · 11-26-2012, 11:08 PM

Transmission Controlled Spark.

I think, something to do with spark/timing when the trans was in certain gear.

Most everyone's has been disconnected, don't think it's a big deal.

Someone with more knowledge will hopefully chime in.

Andy4639 · 11-26-2012, 11:30 PM

It looks like a circuit breaker to me. If it's not wired up to anything get rid of it.

Tinkermc · 11-27-2012, 10:38 AM

looks like a self resetting circut breaker

**jaros44sr** · 11-27-2012, 02:51 PM

What color wires go to it, and how many?

John H. · 11-27-2012, 02:52 PM

If it is the TCS system, I believe you will have a green wire going to a temp sensor on the passenger side head and another wire that goes to the trans. They usually, depending on the year, would go to another solenoid on the carb or intake that would control the vac advance. Basically, if your truck/car was not at temp, it would not allow the advance on distributor to engage until the engine warmed up.

ole dollor · 11-27-2012, 06:51 PM

i think its the blower relay for the heater and a/c blower motor, ole dollor has one in the same place, was a none a/c cab just heater...

Aaron Burkemper · 11-27-2012, 09:23 PM

It looks as if it is the high-speed A/C fan relay. Check and see if your fan works on the highest setting.

ERASER5 · 11-27-2012, 09:50 PM

It is definitely the relay for the TCS system. The feature shut off the vacuum advance until the engine was above 32 degrees F and in high gear. The other parts that may or may not still be on the truck is the vacuum switch mounted to the left of the carb interrupting the vac to the vac advance can, a temp switch in the passenger head, and a switch screwed into a port in the trans.

When/if you remove the parts, keep them safe. Guys doing a full factory resto want them. That's where mine went to.

Also, the power wire is a great source for an electric choke as it is Key On and already loomed in..

clemsonteg · 11-28-2012, 06:51 PM

Thanks for the info. I will have to look for any additional pieces. For additional info if anyone is curious, my truck is a 1970 w/a 307 and 3 on the tree non-ac truck.
Posted via Mobile Device

PAWS 72 · 11-29-2012, 12:13 AM

Mine was originally a 307 3 on the tree. Never did have one on mine.

11-26-2012, 10:43 PM	#1
clemsonteg Registered User Join Date: Jul 2012 Location: Anderson,SC Posts: 953	What is this electrical piece? Does anyone know what the electrical connector circled in red is for? mine is charred like it shorted out at one time and the wire I assume is connected to it on the firewall block is melted as well. The truck seems to run fine so I don't think it is affecting anything, but it would be nice to know what it is and if it will cause problems in the future. Attached Images

11-26-2012, 10:48 PM	#2
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: What is this electrical piece? It's to small for me to make out. Can you get it a little bigger? I don't think it's suppose to be mounted there either form factory anyway. __________________ 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.

11-26-2012, 10:51 PM	#3
clemsonteg Registered User Join Date: Jul 2012 Location: Anderson,SC Posts: 953	Re: What is this electrical piece? This actually isn't a picture of my truck, but I have the same connector in the same spot, the only difference is my truck is non-ac

11-26-2012, 10:57 PM	#4
clemsonteg Registered User Join Date: Jul 2012 Location: Anderson,SC Posts: 953	Re: What is this electrical piece? Here is a picture of the piece on my truck Attached Images

11-26-2012, 10:59 PM	#5
MikeyMan Registered User Join Date: May 2008 Location: S.W. Chicago, IL. Posts: 317	Re: What is this electrical piece? That might be TCS wiring stuff. Don't really need it, mines kinda balled up in the same area.

11-26-2012, 11:08 PM	#7
MikeyMan Registered User Join Date: May 2008 Location: S.W. Chicago, IL. Posts: 317	Re: What is this electrical piece? Transmission Controlled Spark. I think, something to do with spark/timing when the trans was in certain gear. Most everyone's has been disconnected, don't think it's a big deal. Someone with more knowledge will hopefully chime in.

11-26-2012, 11:30 PM	#8
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: What is this electrical piece? It looks like a circuit breaker to me. If it's not wired up to anything get rid of it. __________________ 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.

11-27-2012, 10:38 AM	#9
Tinkermc Registered User Join Date: Jul 2011 Location: Farmville, Va Posts: 3,026	Re: What is this electrical piece? looks like a self resetting circut breaker

11-27-2012, 02:51 PM	#10
jaros44sr Senior Member Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,500	Re: What is this electrical piece? What color wires go to it, and how many? __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim

11-27-2012, 02:52 PM	#11
John H. Registered User Join Date: Oct 2007 Location: Sammamish, WA Posts: 2,115	Re: What is this electrical piece? If it is the TCS system, I believe you will have a green wire going to a temp sensor on the passenger side head and another wire that goes to the trans. They usually, depending on the year, would go to another solenoid on the carb or intake that would control the vac advance. Basically, if your truck/car was not at temp, it would not allow the advance on distributor to engage until the engine warmed up.

11-27-2012, 06:51 PM	#12
ole dollor Registered User Join Date: May 2012 Location: Anton, Texas Posts: 2,364	Re: What is this electrical piece? i think its the blower relay for the heater and a/c blower motor, ole dollor has one in the same place, was a none a/c cab just heater...

11-27-2012, 09:23 PM	#13
Aaron Burkemper Registered User Join Date: Sep 2011 Location: New Melle, MO Posts: 104	Re: What is this electrical piece? It looks as if it is the high-speed A/C fan relay. Check and see if your fan works on the highest setting. Last edited by Aaron Burkemper; 11-27-2012 at 09:24 PM. Reason: More info.

11-27-2012, 09:50 PM	#14
ERASER5 Registered User Join Date: Jun 2006 Location: Indiana Posts: 4,859	Re: What is this electrical piece? It is definitely the relay for the TCS system. The feature shut off the vacuum advance until the engine was above 32 degrees F and in high gear. The other parts that may or may not still be on the truck is the vacuum switch mounted to the left of the carb interrupting the vac to the vac advance can, a temp switch in the passenger head, and a switch screwed into a port in the trans. When/if you remove the parts, keep them safe. Guys doing a full factory resto want them. That's where mine went to. Also, the power wire is a great source for an electric choke as it is Key On and already loomed in.. __________________ '70 GMC C1500 LWB Power disc brakes. WooHoo! Posi 6 Lug Dana 60

11-28-2012, 06:51 PM	#15
clemsonteg Registered User Join Date: Jul 2012 Location: Anderson,SC Posts: 953	Re: What is this electrical piece? Thanks for the info. I will have to look for any additional pieces. For additional info if anyone is curious, my truck is a 1970 w/a 307 and 3 on the tree non-ac truck. Posted via Mobile Device

11-29-2012, 12:13 AM	#16
PAWS 72 Registered User Join Date: Nov 2011 Location: Sheffield, ALA Posts: 2,471	Re: What is this electrical piece? Mine was originally a 307 3 on the tree. Never did have one on mine.



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