wiring question: what is it? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

shifty · 05-04-2007, 12:31 AM

quick question - i'm rewiring my whole truck using the SA-1000 harness from Current Performance and a very small group of wires from my factory wiring harness. I will be deleting the factory bulkhead entirely, I think.

SO. Tell me something - there is a silver box attached to the red and green wires in this picture (bottom middle)....what is it?

Most of my wiring dissection is done - I am actually pretty freaking surprised at how simple the wiring in our trucks is!! There are really only ~2 dozen wires total on a basic truck...a dozen and a half inside the cab and a dozen in the engine bay. Wild stuff to think about how little these things required to run

shifty · 05-04-2007, 12:33 AM

Actually - one other question: Does anyone know of an aftermarket flasher receptacle you can buy? I'll need one for my hazards (top right flasher on bulkhead) and my blinkers (top left flasher on bulkhead)

Blue85 · 05-04-2007, 12:54 AM

Thats the horn relay, not sure about the flasher receptacle though.

shifty · 05-04-2007, 01:01 AM

Interesting. I would have never thought that the horn would have its own relay. wonder why in the hell they'd make the damned thing such a large gauge wire? Stranger still, it's a relay but it's not grounded, and there is no input wire? Odd indeed.

Thanks for the info, I would have absolutely never guessed that's what it was

cstm68 · 05-04-2007, 01:12 AM

yup horn relay !!

shifty · 05-04-2007, 01:14 AM

actually, that makes sense. it's grounded through the case, and bolted to the inner firewall to achieve ground. horn cap completes the circuit..but still don't get why the thick ass 12ga wire is used

kbs71 · 05-04-2007, 11:38 AM

Shifty,
If you look here http://67-72chevytrucks.com/vboard/s...wiring+diagram It's the wiring diagram for our trucks. GM used 12 Gauge Red wire for the power curcuit through out the entire truck. As you can see it has two points where multipul wires connect. So this basically makes it one circuit all with the same amperage running thru it. If they had made one wire a smaller gauge, it could have burnt up.

shifty · 05-04-2007, 12:18 PM

oh, i have that wiring diagram printed out in full color and hanging in my garage already

05-04-2007, 12:31 AM	#1
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	wiring question: what is it? quick question - i'm rewiring my whole truck using the SA-1000 harness from Current Performance and a very small group of wires from my factory wiring harness. I will be deleting the factory bulkhead entirely, I think. SO. Tell me something - there is a silver box attached to the red and green wires in this picture (bottom middle)....what is it? Most of my wiring dissection is done - I am actually pretty freaking surprised at how simple the wiring in our trucks is!! There are really only ~2 dozen wires total on a basic truck...a dozen and a half inside the cab and a dozen in the engine bay. Wild stuff to think about how little these things required to run Attached Images __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

05-04-2007, 12:33 AM	#2
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: wiring question: what is it? Actually - one other question: Does anyone know of an aftermarket flasher receptacle you can buy? I'll need one for my hazards (top right flasher on bulkhead) and my blinkers (top left flasher on bulkhead) __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

05-04-2007, 12:54 AM	#3
Blue85 Oilfield Trash Join Date: Sep 2003 Location: Raymore, Sk, Canada, Earth Posts: 3,171	Re: wiring question: what is it? Thats the horn relay, not sure about the flasher receptacle though. __________________ 14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr.

05-04-2007, 01:01 AM	#4
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: wiring question: what is it? Interesting. I would have never thought that the horn would have its own relay. wonder why in the hell they'd make the damned thing such a large gauge wire? Stranger still, it's a relay but it's not grounded, and there is no input wire? Odd indeed. Thanks for the info, I would have absolutely never guessed that's what it was __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

05-04-2007, 01:12 AM	#5
cstm68 Registered User Join Date: Jan 2007 Location: shoreline, wa Posts: 1,565	Re: wiring question: what is it? yup horn relay !! __________________ 68 swb fleet bagged on 20's 327 with 4 speed http://67-72chevytrucks.com/vboard/s...d.php?t=223308 2014 Chevy 2500hd duramax CCLB

05-04-2007, 01:14 AM	#6
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: wiring question: what is it? actually, that makes sense. it's grounded through the case, and bolted to the inner firewall to achieve ground. horn cap completes the circuit..but still don't get why the thick ass 12ga wire is used __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

05-04-2007, 11:38 AM	#7
kbs71 71 rustless in texas Join Date: Aug 2004 Location: Houston, TX Posts: 257	Re: wiring question: what is it? Shifty, If you look here http://67-72chevytrucks.com/vboard/s...wiring+diagram It's the wiring diagram for our trucks. GM used 12 Gauge Red wire for the power curcuit through out the entire truck. As you can see it has two points where multipul wires connect. So this basically makes it one circuit all with the same amperage running thru it. If they had made one wire a smaller gauge, it could have burnt up. __________________ "The secret to creativity is knowing how to hide your sources." "No one really listens to anyone else, and if you try it for a while you'll see why" 71 C-10 LWB presently in a perpetual state of disassembly '96 Toyota (my work car) '04 Mustang Convertable (wife's car & other money pit) Latest aquesition and why my trucks still in the garage covered with junk.. 2010 Aqua Blue metallic 6 speed Manual LS3 2SS/RS Camaro (I want one of these in my truck FAQ here VENDORS here SUPPORT THE BOARD here My second favorite SITE

05-04-2007, 12:18 PM	#8
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: wiring question: what is it? oh, i have that wiring diagram printed out in full color and hanging in my garage already __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.



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