Name that electical component.... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

frankdatank01 · 08-19-2007, 09:30 PM

Anyone able to tell me what these are and do?

On a 1970 CST10 with the 70s 455 buick 455. Still has external regulator and HEI.

I have a new wire harness and just want to make sure I dont remove something that I might need.

Thanks all.

Tank

**rob32472** · 08-19-2007, 10:32 PM

looks like dual horn relays

**truckdude239** · 08-19-2007, 10:54 PM

horn rtelay is under the dash i got them on my truck they hooked up but no clue what they go too but someone will pitch in

Sport/Truck · 08-19-2007, 10:59 PM

The suspense is killing me…..Please someone….
s/t

BurnoutNova · 08-20-2007, 01:49 AM

my truck has the wires there for those... but there not hooked up to anything. ive been wondering what those wires went to forever!

Peter82 · 08-20-2007, 02:52 AM

i dont know how many of you guys have this but it might help. they are for wire chasing.

72armyswbtruck · 08-20-2007, 06:41 AM

When I get home I have an ultra cool 71 Chevy Repair manual (earlier repairs for the new vehicles in 71) anyways it has this ultra cool road map where every component is given an number to where it connects to like on a map. Part 72 dg a3 (obviously the part #, then dg for color of wire then A3 for the location of the part that the wire hooks into and what). Let me check when I get home.

cdowns · 08-20-2007, 08:51 AM

the 2relays for the dumdass useless transmission spark control was a febel attempt at some type of emissions control by gm

Blazer1970 · 08-20-2007, 04:29 PM

Quote:

Originally Posted by cdowns

the 2relays for the dumdass useless transmission spark control was a febel attempt at some type of emissions control by gm

Yes, they are for the TCS (transmission controlled spark) system.

BurnoutNova · 08-20-2007, 04:34 PM

anyone have more info on this?

is this why there is what looks like a pressure sensor on one of the ports ion the pass side of my trans? i also saw it on my friends all originla 70 blazer when i rebiult the transmission it it.

i'd never seen a switch like that on a th350, only on th400's for the kickdown

**truckdude239** · 08-20-2007, 10:42 PM

umm if thats the case why do i have it on a 3 speed? lol

**WorkinLonghorn** · 08-20-2007, 11:00 PM

From a period repair book;"TransmissionControlled Spark Advance; The vacuum solenoid that was used in 1970 is changed to a Combination Emissions Control (CEC) solenoid and has two functions: it controls distributor advance and acts as a deceleration throttle stop in high gear to reduce emissions." It goes on to mention the presure switch on the trans,the relay, AND a "time delay relay". It also lists a system for manual trans models and trucks.Brian

jhow66 · 08-20-2007, 11:42 PM

In other words-get rid on them.

66skylarkpost · 08-21-2007, 01:58 AM

did someone say buick 455 ?

**WorkinLonghorn** · 08-21-2007, 10:47 AM

Quote:

In other words-get rid on them.

LOL, yeah. Unless of course you live in California and current proposed legislation continues to pass (currently with some transportation committee) and ALL older vehicles are again required to pass inspection and testing! But then you wouldn't get by with a 455 either.

08-19-2007, 09:30 PM	#1
frankdatank01 Registered User Join Date: Jun 2007 Location: Dayton, Ohio Posts: 95	Name that electical component.... Anyone able to tell me what these are and do? On a 1970 CST10 with the 70s 455 buick 455. Still has external regulator and HEI. I have a new wire harness and just want to make sure I dont remove something that I might need. Thanks all. Tank

08-19-2007, 10:32 PM	#2
rob32472 Registered User Join Date: May 2007 Location: dallas ga Posts: 1,505	Re: Name that electical component.... looks like dual horn relays

08-19-2007, 10:54 PM	#3
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,233	Re: Name that electical component.... horn rtelay is under the dash i got them on my truck they hooked up but no clue what they go too but someone will pitch in __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

08-19-2007, 10:59 PM	#4
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Name that electical component.... The suspense is killing me…..Please someone…. s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

08-20-2007, 01:49 AM	#5
BurnoutNova Registered User Join Date: Mar 2004 Location: CA Posts: 2,057	Re: Name that electical component.... my truck has the wires there for those... but there not hooked up to anything. ive been wondering what those wires went to forever!

08-20-2007, 02:52 AM	#6
Peter82 Everything is Custom Join Date: Aug 2007 Location: Blairsville, PA Posts: 85	Re: Name that electical component.... i dont know how many of you guys have this but it might help. they are for wire chasing. Attached Images

08-20-2007, 06:41 AM	#7
72armyswbtruck Registered User Join Date: Feb 2004 Location: Idaho Posts: 4,034	Re: Name that electical component.... When I get home I have an ultra cool 71 Chevy Repair manual (earlier repairs for the new vehicles in 71) anyways it has this ultra cool road map where every component is given an number to where it connects to like on a map. Part 72 dg a3 (obviously the part #, then dg for color of wire then A3 for the location of the part that the wire hooks into and what). Let me check when I get home. __________________ "Remember, They can Kill You, but they can't eat You, That's against the law!!!!!!!!!"

08-20-2007, 08:51 AM	#8
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Name that electical component.... the 2relays for the dumdass useless transmission spark control was a febel attempt at some type of emissions control by gm __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

08-20-2007, 04:34 PM	#10
BurnoutNova Registered User Join Date: Mar 2004 Location: CA Posts: 2,057	Re: Name that electical component.... anyone have more info on this? is this why there is what looks like a pressure sensor on one of the ports ion the pass side of my trans? i also saw it on my friends all originla 70 blazer when i rebiult the transmission it it. i'd never seen a switch like that on a th350, only on th400's for the kickdown

08-20-2007, 10:42 PM	#11
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,233	Re: Name that electical component.... umm if thats the case why do i have it on a 3 speed? lol __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

08-20-2007, 11:00 PM	#12
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,861	Re: Name that electical component.... From a period repair book;"TransmissionControlled Spark Advance; The vacuum solenoid that was used in 1970 is changed to a Combination Emissions Control (CEC) solenoid and has two functions: it controls distributor advance and acts as a deceleration throttle stop in high gear to reduce emissions." It goes on to mention the presure switch on the trans,the relay, AND a "time delay relay". It also lists a system for manual trans models and trucks.Brian __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent.

08-20-2007, 11:42 PM	#13
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: Name that electical component.... In other words-get rid on them. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

08-21-2007, 01:58 AM	#14
66skylarkpost Registered User Join Date: Mar 2006 Location: kearney,nebraska Posts: 443	Re: Name that electical component.... did someone say buick 455 ? __________________ '70 k-10 longbox- mid 70's drivetrain 350/350 487x heads 10.1:1 flowmasters ,35's 3.73's auburn posi ,rear shackle flip. '72 short stepside U.S. forestry truck, '73 455 buick,400 turbo,dropped 2"-4 1/4" ,3.07 posi,:'89 silverado 1500 ,OK truck ,5.7 holley tbi ,trick 700r4 3.07 auburn posi ,and my '66 skylark ,'73 centurion and my '84 monte carlo imca stock car



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