Front wiring harness question... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**COBALT** · 12-22-2002, 06:42 PM

Ok, so I've finally decided to clean up my front wiring harness, and I've come across a wire that doesn't seem to have a connection.

There's a white fiber-wrapped wire that is contained in the front wiring harness under the hood lip above the firewall. It runs to a junction block on the firewall under the brake booster. From there it travels along the top of the firewall and near the passenger side of the firewall it splits into two yellow wires. Yellow wire goes to the + side of the coil, while the other yellow wire traveled down toward the transmission, but is disconnected, broke, dirty, and doesn't look like it's been connected to anything for a while.

I have no idea where it should go. My detent switch for my 400 is connected and on the right circuit, so that's not it. Anyone know?

Gordo · 12-22-2002, 06:51 PM

If you still have points, it should be connected to the "R" terminal on the starter solenoid.

72MARIO · 12-22-2002, 07:20 PM

If you have HEI that wire is garbage. Cut it at the firewall. (junction box all the wires meet there.)

**COBALT** · 12-22-2002, 07:48 PM

Well, I still have points. The starter is pretty filthy. Is the "R" side the outside of the starter? Is it the side that runs to the + side of the coil? If it is what's the point of having it connected?

Gordo · 12-22-2002, 09:38 PM

Yes, it would be the small outside terminal marked "R", the small inside one would be marked "S" and should have a purple wire attached. The "R" terminal will send a direct 12 Volts to the coil while the starter is cranking to ensure a strong spark output. After the starter is released and the engine is running the engine will operate off the resister wire with reduced current.

12-22-2002, 06:42 PM	#1
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Front wiring harness question... Ok, so I've finally decided to clean up my front wiring harness, and I've come across a wire that doesn't seem to have a connection. There's a white fiber-wrapped wire that is contained in the front wiring harness under the hood lip above the firewall. It runs to a junction block on the firewall under the brake booster. From there it travels along the top of the firewall and near the passenger side of the firewall it splits into two yellow wires. Yellow wire goes to the + side of the coil, while the other yellow wire traveled down toward the transmission, but is disconnected, broke, dirty, and doesn't look like it's been connected to anything for a while. I have no idea where it should go. My detent switch for my 400 is connected and on the right circuit, so that's not it. Anyone know? __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

12-22-2002, 06:51 PM	#2
Gordo Registered User Join Date: Jan 2001 Location: Killingworth, CT. USA Posts: 3,378	If you still have points, it should be connected to the "R" terminal on the starter solenoid. __________________ 1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist.

12-22-2002, 07:20 PM	#3
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	If you have HEI that wire is garbage. Cut it at the firewall. (junction box all the wires meet there.) __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

12-22-2002, 07:48 PM	#4
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Well, I still have points. The starter is pretty filthy. Is the "R" side the outside of the starter? Is it the side that runs to the + side of the coil? If it is what's the point of having it connected? __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

12-22-2002, 09:38 PM	#5
Gordo Registered User Join Date: Jan 2001 Location: Killingworth, CT. USA Posts: 3,378	Yes, it would be the small outside terminal marked "R", the small inside one would be marked "S" and should have a purple wire attached. The "R" terminal will send a direct 12 Volts to the coil while the starter is cranking to ensure a strong spark output. After the starter is released and the engine is running the engine will operate off the resister wire with reduced current. __________________ 1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist.



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