firewall harness, what wires are these? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Blue4x4 · 06-06-2006, 11:14 PM

Sorry but no pic's on this one. I am looking for information on the harness that is located about 3 inches above the MAIN wiring harness, Just to the right of where the spedo cable exits the firewall. Looks to have about 5 wires in it. Behind the dash, it goes to a relay and the fuse box. Please help identify these wires. Goes on a 71 4x4 blazer with factory ac.

Oldtruckfanatic · 06-06-2006, 11:23 PM

Hey there I'm in Reno too. I'm going out to look at mine right now.

Blue4x4 · 06-06-2006, 11:24 PM

here you go.

Blue4x4 · 06-06-2006, 11:25 PM

call me at 358-3722

Oldtruckfanatic · 06-06-2006, 11:33 PM

Where does that go from there the relay on the inside next to the fuse block on mine is the horn relay. I have one wire in that location and it goes to the blower motor relay and since yours has factory ac it could be the a/c/ switch relay. Mine has no air.

BobbyK · 06-07-2006, 03:21 AM

I believe it is the harness for the TCS (Transmission Controlled Spark) system.
Basically it's an emmissions thing.

My harness was still still on my truck when I got it but the TCS solenoid was gone and the circuit was not functioning.
I removed that harness when I switched to TPI.

BobbyK · 06-07-2006, 03:25 AM

Quote:

Originally Posted by Oldtruckfanatic

Where does that go from there the relay on the inside next to the fuse block on mine is the horn relay. I have one wire in that location and it goes to the blower motor relay and since yours has factory ac it could be the a/c/ switch relay. Mine has no air.

A/C relay is located on the diverter box on the inside passenger side of the truck.

FRENCHBLUE72 · 06-07-2006, 10:35 PM

Mine went away when I put the painless harness in..

masterbeavis · 06-09-2006, 08:32 PM

I went and looked at the two rigs in the driveway. My '71 (build date 05/71) with AC did not have this harnass, nor did it have the dingleberry on the transmission. Engine calibration code AQ. US Dept. of N.E.W and CA. certified

My '72 CST(build date 04/72) had it. Engine calibration code LM, federal and CA compliant. In the harnass there was the feed to the coil, and 3 other wires (that I noticed) that went to a plug, (whatever it plugs into is gone, no suprise there) then down to the transmission.

masterbeavis · 06-13-2006, 04:20 PM

On both of my rigs, one ear is broken off of each one.

HEI/tach pic shown here.

LUV2XCLR8 · 06-13-2006, 05:20 PM

I have a full upgraded wiring system too, no help just a bump

Chevrolet4x4s · 06-13-2006, 05:26 PM

Exactly what is a "dingleberry"

Shane

masterbeavis · 06-15-2006, 11:29 AM

its a thingie used in upholstery, its a little ball on a string, commonly seen (in the old days in cars driven by mexicans, and indian (not nativie) cab drivers in NYC. Also refered to "something" stuck to hair on a nether region of your backside that has balled up. I will let you draw your own conclusions.

06-06-2006, 11:14 PM	#1
Blue4x4 Senior Member Join Date: Mar 2003 Location: Sparks, NV Posts: 790	firewall harness, what wires are these? Sorry but no pic's on this one. I am looking for information on the harness that is located about 3 inches above the MAIN wiring harness, Just to the right of where the spedo cable exits the firewall. Looks to have about 5 wires in it. Behind the dash, it goes to a relay and the fuse box. Please help identify these wires. Goes on a 71 4x4 blazer with factory ac.

06-06-2006, 11:23 PM	#2
Oldtruckfanatic Truck junkie Join Date: May 2006 Location: Reno NV Posts: 697	Re: firewall harness, what wires are these? Hey there I'm in Reno too. I'm going out to look at mine right now.

06-06-2006, 11:24 PM	#3
Blue4x4 Senior Member Join Date: Mar 2003 Location: Sparks, NV Posts: 790	Re: firewall harness, what wires are these? here you go. Attached Images

06-06-2006, 11:25 PM	#4
Blue4x4 Senior Member Join Date: Mar 2003 Location: Sparks, NV Posts: 790	Re: firewall harness, what wires are these? call me at 358-3722

06-06-2006, 11:33 PM	#5
Oldtruckfanatic Truck junkie Join Date: May 2006 Location: Reno NV Posts: 697	Re: firewall harness, what wires are these? Where does that go from there the relay on the inside next to the fuse block on mine is the horn relay. I have one wire in that location and it goes to the blower motor relay and since yours has factory ac it could be the a/c/ switch relay. Mine has no air.

06-07-2006, 03:21 AM	#6
BobbyK Registered User Join Date: May 2000 Location: Petrolia,Ontario,Canada but working in Port Huron,Mi. Posts: 1,772	Re: firewall harness, what wires are these? I believe it is the harness for the TCS (Transmission Controlled Spark) system. Basically it's an emmissions thing. My harness was still still on my truck when I got it but the TCS solenoid was gone and the circuit was not functioning. I removed that harness when I switched to TPI. __________________ 71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension. Petrolia,Ontario,Canada but working in Port Huron,MI. See ALL my Blazer pic's HERE Last edited by BobbyK; 06-07-2006 at 03:23 AM.

06-07-2006, 10:35 PM	#8
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,606	Re: firewall harness, what wires are these? Mine went away when I put the painless harness in.. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

06-09-2006, 08:32 PM	#9
masterbeavis Having issues Join Date: Jul 2005 Location: Eldorado Ca, an hour east of sacramento Posts: 696	Re: firewall harness, what wires are these? I went and looked at the two rigs in the driveway. My '71 (build date 05/71) with AC did not have this harnass, nor did it have the dingleberry on the transmission. Engine calibration code AQ. US Dept. of N.E.W and CA. certified My '72 CST(build date 04/72) had it. Engine calibration code LM, federal and CA compliant. In the harnass there was the feed to the coil, and 3 other wires (that I noticed) that went to a plug, (whatever it plugs into is gone, no suprise there) then down to the transmission. __________________ Quando Omni Flunkus Moritati. The Man's Prayer: "I'm a man, but I can change, if I have to, I guess." Last edited by masterbeavis; 06-09-2006 at 08:36 PM.

06-13-2006, 04:20 PM	#10
masterbeavis Having issues Join Date: Jul 2005 Location: Eldorado Ca, an hour east of sacramento Posts: 696	Re: firewall harness, what wires are these? On both of my rigs, one ear is broken off of each one. HEI/tach pic shown here. __________________ Quando Omni Flunkus Moritati. The Man's Prayer: "I'm a man, but I can change, if I have to, I guess." Last edited by masterbeavis; 06-13-2006 at 04:21 PM.

06-13-2006, 05:20 PM	#11
LUV2XCLR8 The LuvShack Garage Join Date: Jan 2004 Location: Maple Grove, TN (West Side) Posts: 30,468	Re: firewall harness, what wires are these? I have a full upgraded wiring system too, no help just a bump __________________ Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T

06-13-2006, 05:26 PM	#12
Chevrolet4x4s Registered User Join Date: Nov 2005 Location: WV Posts: 227	Re: firewall harness, what wires are these? Exactly what is a "dingleberry" Shane __________________ 1993 K1500 350 5 speed 1985 K10 Silverado Vortec 406 5 speed (in body shop) "I been drivin' this '85 pickup truck Them buddies of mine call it a bucket of rust She's a little beat up but she still runs like the wind Yeah, kinda like me I been banged and bruisedBeen around the block a time or two But I'm runnin' like new goin' places I never been No, I ain't broke I'm just broken in" 1963 Dodge Townwagon(its amazng what 30 years and zero miles will do to a vehicle ) Member#20327

06-15-2006, 11:29 AM	#13
masterbeavis Having issues Join Date: Jul 2005 Location: Eldorado Ca, an hour east of sacramento Posts: 696	Re: firewall harness, what wires are these? its a thingie used in upholstery, its a little ball on a string, commonly seen (in the old days in cars driven by mexicans, and indian (not nativie) cab drivers in NYC. Also refered to "something" stuck to hair on a nether region of your backside that has balled up. I will let you draw your own conclusions. __________________ Quando Omni Flunkus Moritati. The Man's Prayer: "I'm a man, but I can change, if I have to, I guess."



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