wire id please - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**67sss** · 01-22-2011, 04:34 PM

just got a 72 highlander and am going thru the engine bay. I know green wires are usually temp wires(the one on the left), any ideas what the other 2 wires are for? There's a temp sending unit on each side of the block. First pic of sending unit is on pass side other is on drivers side. I'm just trying to get engine to run or start, after a compression test,fresh oil, new gas, plugs ect... before I decide whether to keep the truck or part out. Thanks

BLACK AND BLUE 67-72 · 01-22-2011, 05:11 PM

Green is Temp, Greasy one is for oil idiot light, the other with the flat plug is ????? how many wires Two or Three?

BLACK AND BLUE 67-72 · 01-22-2011, 05:11 PM

Did or does it have a/c?

**67sss** · 01-22-2011, 05:24 PM

no a/c, didn't have it. 3 wires.

BLACK AND BLUE 67-72 · 01-22-2011, 05:39 PM

Turbo 350 or 400?

**67sss** · 01-22-2011, 05:48 PM

350 tranny- M49 on the spid sheet. 400 tranny has a square pan, right?

**VetteVet** · 01-22-2011, 05:50 PM

Probably one of the TSC relay connectors. TSC was a crude emissions device that retarded the ignition spark in relation to engine vacuum. It came out in 70 or 71 IIRC.

**john** · 01-22-2011, 05:51 PM

The one on the pass side head is a switch for the TCS (transmission controlled spark) Only allows vacuum advance in high gear and when up to operating temp. It has usually been removed from most trucks that had it by now.

**67sss** · 01-22-2011, 05:53 PM

VetteVet- This set of wires is in the original harness and is located in the rear of the dist. area, it won't pull over that far. Thanks tho!

BLACK AND BLUE 67-72 · 01-22-2011, 05:59 PM

TCS transmission controlled spark hook up, I'd say thats why there are 2 temp senders also.

BLACK AND BLUE 67-72 · 01-22-2011, 06:00 PM

some had the relay up kind of behind and to the side of the dist. also.

**67sss** · 01-22-2011, 06:06 PM

ok. THANKS! now lets hope for a good compression test!

sameyrasmea72 · 01-22-2011, 06:12 PM

I agree with the others above, it is for the TCS or TSC stuff. That is why there is two temp senders. One for the guage and the other is for the TSC. I found some paper work that explains what id does and how it hooks up but I can't find it.

**VetteVet** · 01-22-2011, 06:24 PM

Google

http://arrc.epnet.com/autoapp/8977/8...ed_Spark__.htm

01-22-2011, 04:34 PM	#1
67sss Registered User Join Date: Nov 2002 Location: Mt. Vernon, WA.. Posts: 2,325	wire id please just got a 72 highlander and am going thru the engine bay. I know green wires are usually temp wires(the one on the left), any ideas what the other 2 wires are for? There's a temp sending unit on each side of the block. First pic of sending unit is on pass side other is on drivers side. I'm just trying to get engine to run or start, after a compression test,fresh oil, new gas, plugs ect... before I decide whether to keep the truck or part out. Thanks Attached Images

01-22-2011, 05:11 PM	#2
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Re: wire id please Green is Temp, Greasy one is for oil idiot light, the other with the flat plug is ????? how many wires Two or Three? __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

01-22-2011, 05:11 PM	#3
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Re: wire id please Did or does it have a/c? __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

01-22-2011, 05:24 PM	#4
67sss Registered User Join Date: Nov 2002 Location: Mt. Vernon, WA.. Posts: 2,325	Re: wire id please no a/c, didn't have it. 3 wires. Attached Images

01-22-2011, 05:39 PM	#5
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Re: wire id please Turbo 350 or 400? __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

01-22-2011, 05:48 PM	#6
67sss Registered User Join Date: Nov 2002 Location: Mt. Vernon, WA.. Posts: 2,325	Re: wire id please 350 tranny- M49 on the spid sheet. 400 tranny has a square pan, right? Attached Images

01-22-2011, 05:50 PM	#7
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,719	Re: wire id please Probably one of the TSC relay connectors. TSC was a crude emissions device that retarded the ignition spark in relation to engine vacuum. It came out in 70 or 71 IIRC. Attached Images __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

01-22-2011, 05:51 PM	#8
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: wire id please The one on the pass side head is a switch for the TCS (transmission controlled spark) Only allows vacuum advance in high gear and when up to operating temp. It has usually been removed from most trucks that had it by now. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

01-22-2011, 05:53 PM	#9
67sss Registered User Join Date: Nov 2002 Location: Mt. Vernon, WA.. Posts: 2,325	Re: wire id please VetteVet- This set of wires is in the original harness and is located in the rear of the dist. area, it won't pull over that far. Thanks tho!

01-22-2011, 05:59 PM	#10
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Re: wire id please TCS transmission controlled spark hook up, I'd say thats why there are 2 temp senders also. __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

01-22-2011, 06:00 PM	#11
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Re: wire id please some had the relay up kind of behind and to the side of the dist. also. __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

01-22-2011, 06:06 PM	#12
67sss Registered User Join Date: Nov 2002 Location: Mt. Vernon, WA.. Posts: 2,325	Re: wire id please ok. THANKS! now lets hope for a good compression test!

01-22-2011, 06:12 PM	#13
sameyrasmea72 Senior Member Join Date: Aug 2003 Location: Lubbock, Texas Posts: 2,443	Re: wire id please I agree with the others above, it is for the TCS or TSC stuff. That is why there is two temp senders. One for the guage and the other is for the TSC. I found some paper work that explains what id does and how it hooks up but I can't find it. __________________ 72 Cheyenne Super 80 Silverado Blazer 2wd

01-22-2011, 06:24 PM	#14
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,719	Re: wire id please Google http://arrc.epnet.com/autoapp/8977/8...ed_Spark__.htm __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

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