where does this wire go?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dubie · 05-29-2004, 01:49 PM

I am at the shop right now and this is the last wire to hook up, now where does it go to? Does it ground to the rad support or does it feed back to the battery? And if it goes to the battery, which terminal?

dubie · 05-29-2004, 01:52 PM

a lighter pic. It's the red wire I am wondering about

cdowns · 05-29-2004, 01:53 PM

positive battery

Jeepster376 · 05-29-2004, 01:54 PM

That is your alternator feed to the battery. + side.

dubie · 05-29-2004, 02:38 PM

Fuel lines.

Why do I have 2 lines coming to the front of the frame and only 1 port to hook them up to on the fuel pump?
This is a pic of my 72 parts truck that has the same set up

cdowns · 05-29-2004, 02:48 PM

second line is the vapor line to return vapors from those stupip charcoal canister thinds

*Slams_58* · 05-29-2004, 03:30 PM

Can we just cap it?

canadianchevy72 · 05-29-2004, 03:46 PM

Ah HA! I know found the reason my alternator isnt charging!

jorgensensc · 05-29-2004, 03:55 PM

Actually the red wire goe to the pos. battery cable. that thing it connects to is the power junction box. It runs a lot of different things. I'm not sure, but I think the alternator might connect back through there also.

**CPNE** · 05-29-2004, 05:32 PM

Quote:

Originally Posted by Slams_58

Can we just cap it?

Yes. The 3/8 line should go to your fuel pump. The other should be 5/16th and can be deleted, assuming you don't have a return line from fuel pump. After 70 or so, a return line to the tank was used on 1/2 tons, helped with vapor lock and emmissions stuff.

Russell · 05-29-2004, 06:24 PM

I've got my return line plugged off as well, no problems to speak of, and I have dual tanks now!

71-longbed · 06-07-2004, 08:17 AM

the red wire that goes to the juntion box ... does it have a fuse inline... i know they call it a fuseable link .. but i just wanted to be sure .. im planning on making my own positive battery cable .. just making sure i wont fry something by not having a fuse between the + terminal and the juntion box .... anyone??

thanks

kbs71 · 08-21-2004, 03:07 AM

Go to www.madelectric.com and check out his explanation of the older GM wiring harnesses.

71-longbed · 08-21-2004, 03:46 AM

link doesn't work

jimfulco · 08-21-2004, 04:03 AM

try www.madelectrical.com

Huck · 08-21-2004, 08:01 AM

re. fuel vent line. If you just plug this cannister line solid on a 72, you may have created a venting problem as these trucks were vented thru this line. So what you might want to do is route it upward away from exhaust, spark potential, etc and put a vent cap on the hose so as to allow the tank to breathe. Plugged, you will probably get a huge hiss when you open your correct 72 tank cap. Another option is to plug the line solid but use an early tank cap which is vented. YOu then sometimes may get gas vapors from the cap so ---your call just want to make sure you don't fix one problem and create another--been there done that all too often!! Huck

Huck · 08-21-2004, 08:15 AM

GREAT SITE - a sure favorite from now on!!

Tx Firefighter · 08-21-2004, 08:19 AM

Dubie, throw that wire away and replace it with a fusible link. Someone has done away with the fusible link on your truck. It's what protects that circuit.

Running no fusible link is like wrapping all your fuses with aluminum foil. They are too important to negate them.

ChevLoRay · 08-21-2004, 09:46 AM

"THAT" wire, if allowed to ground against anything, will reduce the wiring harness to garbage. I can testify to that event, in that the alternator end got against my headers and the whole harness had a soft "glow" about 6AM one morning. Also, the engine will die, when the wire is grounded. If a fusible link is appropriate, go for it. Whatever came in my NEW harness, is what I installed. The new harness also had clips that route the harness out of harms way and restrain it to prevent the "uh-oh" that fried my harness and made for a bad day.

Make sure that you clean, wire brush, or whatever is handy, the terminal block that the wires attach to. Also, make sure that the insulator is good. GM doesn't have any of them available, to my knowledge, nor did I find a replacement part.

I didn't have a pair of wire cutters (diagonal cutters, aka "dikes") handy, so grabbing a glowing wire is NOT recommended with bare hands. Did that. But, saved the truck in the process, so everything has a price.

05-29-2004, 01:49 PM	#1
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,855	where does this wire go?? I am at the shop right now and this is the last wire to hook up, now where does it go to? Does it ground to the rad support or does it feed back to the battery? And if it goes to the battery, which terminal? Attached Images __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

05-29-2004, 01:52 PM	#2
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,855	a lighter pic. It's the red wire I am wondering about Attached Images __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

05-29-2004, 01:53 PM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	positive battery __________________ 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

05-29-2004, 01:54 PM	#4
Jeepster376 Registered User Join Date: Feb 2004 Location: Massachusetts Posts: 269	That is your alternator feed to the battery. + side. __________________ 72 Cheyenne Super 4x4 SWB

05-29-2004, 02:38 PM	#5
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,855	You guys are the best...1 more question Fuel lines. Why do I have 2 lines coming to the front of the frame and only 1 port to hook them up to on the fuel pump? This is a pic of my 72 parts truck that has the same set up Attached Images __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

05-29-2004, 02:48 PM	#6
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	second line is the vapor line to return vapors from those stupip charcoal canister thinds __________________ 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

05-29-2004, 03:30 PM	#7
Slams_58 Account Suspended Join Date: May 2002 Location: I let ya know as soon as I know Posts: 3,593	Can we just cap it?

05-29-2004, 03:46 PM	#8
canadianchevy72 Registered User Join Date: Mar 2004 Location: Thorsby AB Canada Posts: 206	Ah HA! I know found the reason my alternator isnt charging! __________________ 1972 Chevy C/10 350/200r4

05-29-2004, 03:55 PM	#9
jorgensensc Registered User Join Date: Jul 2003 Location: Cypress, Tx Posts: 4,005	Actually the red wire goe to the pos. battery cable. that thing it connects to is the power junction box. It runs a lot of different things. I'm not sure, but I think the alternator might connect back through there also. __________________ 1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE

05-29-2004, 06:24 PM	#11
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	I've got my return line plugged off as well, no problems to speak of, and I have dual tanks now! __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

06-07-2004, 08:17 AM	#12
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	the red wire that goes to the juntion box ... does it have a fuse inline... i know they call it a fuseable link .. but i just wanted to be sure .. im planning on making my own positive battery cable .. just making sure i wont fry something by not having a fuse between the + terminal and the juntion box .... anyone?? thanks __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

08-21-2004, 03:07 AM	#13
kbs71 71 rustless in texas Join Date: Aug 2004 Location: Houston, TX Posts: 257	Go to www.madelectric.com and check out his explanation of the older GM wiring harnesses.

08-21-2004, 03:46 AM	#14
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	link doesn't work __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

08-21-2004, 04:03 AM	#15
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	try www.madelectrical.com

08-21-2004, 08:01 AM	#16
Huck Senior Member Join Date: Jun 2001 Location: Shelbyville, KY Posts: 3,269	re. fuel vent line. If you just plug this cannister line solid on a 72, you may have created a venting problem as these trucks were vented thru this line. So what you might want to do is route it upward away from exhaust, spark potential, etc and put a vent cap on the hose so as to allow the tank to breathe. Plugged, you will probably get a huge hiss when you open your correct 72 tank cap. Another option is to plug the line solid but use an early tank cap which is vented. YOu then sometimes may get gas vapors from the cap so ---your call just want to make sure you don't fix one problem and create another--been there done that all too often!! Huck



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08-21-2004, 08:15 AM	#17
Huck Senior Member Join Date: Jun 2001 Location: Shelbyville, KY Posts: 3,269	GREAT SITE - a sure favorite from now on!!

08-21-2004, 08:19 AM	#18
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Dubie, throw that wire away and replace it with a fusible link. Someone has done away with the fusible link on your truck. It's what protects that circuit. Running no fusible link is like wrapping all your fuses with aluminum foil. They are too important to negate them. __________________ I'm on the Instagram- @Gearhead_Kevin

08-21-2004, 09:46 AM	#19
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	"THAT" wire, if allowed to ground against anything, will reduce the wiring harness to garbage. I can testify to that event, in that the alternator end got against my headers and the whole harness had a soft "glow" about 6AM one morning. Also, the engine will die, when the wire is grounded. If a fusible link is appropriate, go for it. Whatever came in my NEW harness, is what I installed. The new harness also had clips that route the harness out of harms way and restrain it to prevent the "uh-oh" that fried my harness and made for a bad day. Make sure that you clean, wire brush, or whatever is handy, the terminal block that the wires attach to. Also, make sure that the insulator is good. GM doesn't have any of them available, to my knowledge, nor did I find a replacement part. I didn't have a pair of wire cutters (diagonal cutters, aka "dikes") handy, so grabbing a glowing wire is NOT recommended with bare hands. Did that. But, saved the truck in the process, so everything has a price. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. Last edited by ChevLoRay; 08-21-2004 at 09:49 AM.

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