Does this have a name? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ryanmctee · 03-01-2012, 11:32 AM

Help please. I goofed when I took out my old wiring harness (about two months ago) and did not label this 'block'. It sits above the fusebox just to the right and is attached to the firewall. Definately runs into the engine bay and looks like it goes to the starter maybe? Does anyone know the name and function of this little gem? My new engine harness doesn't have anything that hooks up to this. 1972 k-10 btw.

ryanmctee · 03-01-2012, 11:33 AM

Pictures didn't load. Sorry

808_67C10 · 03-01-2012, 12:43 PM

Heater switch? Horn relay?

ryanmctee · 03-01-2012, 01:37 PM

Found out it's a "Transmission Spark Control". Whatever, it appearantly isn't used anymore. Emisison crap. Anybody looking, check this link: http://67-72chevytrucks.com/vboard/s...d.php?t=421564

**john** · 03-01-2012, 02:27 PM

The TCS (transmission controlled spark) had a vacuum solenoid mounted on the intake manifold and a switch on the transmission that allowed vacuum advance only in high gear when the engine was up to operating temp.

48richard · 03-02-2012, 12:21 PM

In my 71, the horn relay is there by the fuse block. The TCS relays were on the engine side of the firewall, next to the bulkhead connector.

03-01-2012, 11:32 AM	#1
ryanmctee Registered User Join Date: Aug 2011 Location: Gardnerville Nevada Posts: 270	Does this have a name? Help please. I goofed when I took out my old wiring harness (about two months ago) and did not label this 'block'. It sits above the fusebox just to the right and is attached to the firewall. Definately runs into the engine bay and looks like it goes to the starter maybe? Does anyone know the name and function of this little gem? My new engine harness doesn't have anything that hooks up to this. 1972 k-10 btw.

03-01-2012, 11:33 AM	#2
ryanmctee Registered User Join Date: Aug 2011 Location: Gardnerville Nevada Posts: 270	Re: Does this have a name? Pictures didn't load. Sorry Attached Images

03-01-2012, 12:43 PM	#3
808_67C10 Registered User Join Date: Sep 2011 Location: Hilo, Hawaii Posts: 1,051	Re: Does this have a name? Heater switch? Horn relay? __________________ Frank (Hilo, Hawaii) Trucks, Tacos, and Beer go together like Peanut Butter and Ladies! 85 C/10 SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=760383 67 C/10 SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=489298 79 K5 Blazer SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=657461

03-01-2012, 01:37 PM	#4
ryanmctee Registered User Join Date: Aug 2011 Location: Gardnerville Nevada Posts: 270	Re: Does this have a name? Found out it's a "Transmission Spark Control". Whatever, it appearantly isn't used anymore. Emisison crap. Anybody looking, check this link: http://67-72chevytrucks.com/vboard/s...d.php?t=421564

03-01-2012, 02:27 PM	#5
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Does this have a name? The TCS (transmission controlled spark) had a vacuum solenoid mounted on the intake manifold and a switch on the transmission that allowed vacuum advance only in high gear when the engine was up to operating temp. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

03-02-2012, 12:21 PM	#6
48richard Registered User Join Date: Oct 2009 Location: Phoenix, AZ Posts: 475	Re: Does this have a name? In my 71, the horn relay is there by the fuse block. The TCS relays were on the engine side of the firewall, next to the bulkhead connector. __________________ 1971 C10 Longbed, 350/TH350



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