Help!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

truckn' · 08-15-2007, 03:09 PM

65 gmc 110 please tell me what exactly these are and what gets wire to them. electrically my new project is a nightmare, headlights, taillights, blinkers, but have to remove all the "rigging" that has been done over the years by others before I can continue. any help would be greatly appreciated.

Thx and desperate
Truckn'

slorio · 08-15-2007, 03:59 PM

The wiring in your GMC is different from that in Chevy's. I would suggest that you visit the GMC site at:

http://6066gmcguy.org

They have a section on electrical that may be of help. If you check with the moderator, Jolly Goodfellow, he also has a scan of the GMC wiring diagram that he could e mail to you that would be helpful as well.
Regards,
Steve

rodnok1 · 08-15-2007, 04:49 PM

First pic is horn relay and regulator, the main power feed goes through the horn relay(just a terminal). It looks exactly like the wiring on my Chevy by the way...
here's a link to some wiring diagrams in color I did last year.
http://67-72chevytrucks.com/vboard/s...d.php?t=193429

2nd pic of headlight dimmer, you can tell the wiring has been modified to say the least.It looks like somebody hacked the wiring off at the bulkhead connectors and just routed new wires where ever they could. You can get new terminals at Napa and go back to stock connectors. Mine was soo bad when I got it, I had to redo every wire exect the fuel sending wire.

hewlett2002000 · 08-15-2007, 05:43 PM

ok seeing as i have made up a complete custom wiring diagram for my custom harness i am going to make and i have also installed a painless harness in my truck i think this is a stupid question but i have to ask because i dont know. what exactly does the horn relay do and when i make my custom harness do i have to have it? i mean does it cut down voltage or what?
thanks,
John

rodnok1 · 08-15-2007, 08:01 PM

You need the horn relay only for the horn, you'll have to have power to it for the horn to work. The two terminals are really a power block of sorts(bad idea) under the hood they always rust up and are uncovered so you could short them out. I bypassed these terminals for main power and put in a power terminal that I can run power to my relays to(fan/lights/horn) and over to alt(might go inside first I can't remember).

hewlett2002000 · 08-15-2007, 08:18 PM

thats what i thought. i just wanted to make sure. im making my custom harness so i just wanted to make sure it wouldent hurt anything to bypass it.
thanks,
John

Preacher · 08-15-2007, 10:29 PM

I had the same nightmare when I picked up my truck. I ordered a Ron Francis fuse panel and a complete bumper to bumper wire harness and eliminated the whole mess. She's nice now! Don't have to worry if she's going to start or not. Thought that was going to be a big job to install, I could've had my preteenage kids do it. Every wire is color coded and labeled every foot. I was amazed at how easy it was to install and it didn't take long at all!

**ChiefRocka** · 08-15-2007, 11:12 PM

Quote:

Originally Posted by hewlett2002000

ok seeing as i have made up a complete custom wiring diagram for my custom harness i am going to make and i have also installed a painless harness in my truck i think this is a stupid question but i have to ask because i dont know. what exactly does the horn relay do and when i make my custom harness do i have to have it? i mean does it cut down voltage or what?
thanks,
John

The horn relay should be in the block of that Painless kit.

John

hewlett2002000 · 08-15-2007, 11:19 PM

it is but im gonna make mine as simple as possible so im gonna eliminate as much as possible.
john

**ChiefRocka** · 08-16-2007, 10:07 AM

So your eliminating the horn ?

John

truckn' · 08-16-2007, 10:48 AM

lots of good info thx alot guys really helps.

hewlett2002000 · 08-16-2007, 11:28 AM

no im not eliminating the horn. lmao i got an aftermarket horn thats louder so im running that.

08-15-2007, 03:09 PM	#1
truckn' Registered User Join Date: Aug 2006 Location: rogersville tennessee Posts: 276	Help!!! 65 gmc 110 please tell me what exactly these are and what gets wire to them. electrically my new project is a nightmare, headlights, taillights, blinkers, but have to remove all the "rigging" that has been done over the years by others before I can continue. any help would be greatly appreciated. Thx and desperate Truckn' Last edited by truckn'; 03-25-2008 at 11:07 PM.

08-15-2007, 03:59 PM	#2
slorio Registered User Join Date: Sep 2006 Location: Louisiana Posts: 375	Re: Help!!! The wiring in your GMC is different from that in Chevy's. I would suggest that you visit the GMC site at: http://6066gmcguy.org They have a section on electrical that may be of help. If you check with the moderator, Jolly Goodfellow, he also has a scan of the GMC wiring diagram that he could e mail to you that would be helpful as well. Regards, Steve

08-15-2007, 04:49 PM	#3
rodnok1 Registered User Join Date: Jun 2003 Location: Linden, North Carolina Posts: 617	Re: Help!!! First pic is horn relay and regulator, the main power feed goes through the horn relay(just a terminal). It looks exactly like the wiring on my Chevy by the way... here's a link to some wiring diagrams in color I did last year. http://67-72chevytrucks.com/vboard/s...d.php?t=193429 2nd pic of headlight dimmer, you can tell the wiring has been modified to say the least.It looks like somebody hacked the wiring off at the bulkhead connectors and just routed new wires where ever they could. You can get new terminals at Napa and go back to stock connectors. Mine was soo bad when I got it, I had to redo every wire exect the fuel sending wire. __________________ 64 Panel Rebuild Pics Clutch Replacement and Borg Warner T10 Trans Rebuild 64 Panel 1/2 Ton 350cubes/400hp BorgWarner t-10 3:73 Auburn Posi

08-15-2007, 05:43 PM	#4
hewlett2002000 Registered User Join Date: Dec 2006 Location: Cleveland, Tx Posts: 1,619	Re: Help!!! ok seeing as i have made up a complete custom wiring diagram for my custom harness i am going to make and i have also installed a painless harness in my truck i think this is a stupid question but i have to ask because i dont know. what exactly does the horn relay do and when i make my custom harness do i have to have it? i mean does it cut down voltage or what? thanks, John __________________ Respect: 1. A feeling of appreciative, often deferential regard; esteem. 2. The state of being regarded with honor or esteem. 3. Willingness to show consideration or appreciation. When you fail to show consideration to others values you are showing disrespect.

08-15-2007, 08:01 PM	#5
rodnok1 Registered User Join Date: Jun 2003 Location: Linden, North Carolina Posts: 617	Re: Help!!! You need the horn relay only for the horn, you'll have to have power to it for the horn to work. The two terminals are really a power block of sorts(bad idea) under the hood they always rust up and are uncovered so you could short them out. I bypassed these terminals for main power and put in a power terminal that I can run power to my relays to(fan/lights/horn) and over to alt(might go inside first I can't remember). __________________ 64 Panel Rebuild Pics Clutch Replacement and Borg Warner T10 Trans Rebuild 64 Panel 1/2 Ton 350cubes/400hp BorgWarner t-10 3:73 Auburn Posi

08-15-2007, 08:18 PM	#6
hewlett2002000 Registered User Join Date: Dec 2006 Location: Cleveland, Tx Posts: 1,619	Re: Help!!! thats what i thought. i just wanted to make sure. im making my custom harness so i just wanted to make sure it wouldent hurt anything to bypass it. thanks, John __________________ Respect: 1. A feeling of appreciative, often deferential regard; esteem. 2. The state of being regarded with honor or esteem. 3. Willingness to show consideration or appreciation. When you fail to show consideration to others values you are showing disrespect.

08-15-2007, 10:29 PM	#7
Preacher New Member Join Date: Jul 2007 Location: Rochester, NY Posts: 19	Re: Help!!! I had the same nightmare when I picked up my truck. I ordered a Ron Francis fuse panel and a complete bumper to bumper wire harness and eliminated the whole mess. She's nice now! Don't have to worry if she's going to start or not. Thought that was going to be a big job to install, I could've had my preteenage kids do it. Every wire is color coded and labeled every foot. I was amazed at how easy it was to install and it didn't take long at all!

08-15-2007, 11:19 PM	#9
hewlett2002000 Registered User Join Date: Dec 2006 Location: Cleveland, Tx Posts: 1,619	Re: Help!!! it is but im gonna make mine as simple as possible so im gonna eliminate as much as possible. john __________________ Respect: 1. A feeling of appreciative, often deferential regard; esteem. 2. The state of being regarded with honor or esteem. 3. Willingness to show consideration or appreciation. When you fail to show consideration to others values you are showing disrespect.

08-16-2007, 10:07 AM	#10
ChiefRocka Hollister, CA. Join Date: Sep 2006 Location: Hollister, Ca. Posts: 6,150	Re: Help!!! So your eliminating the horn ? John __________________ John What the Heck is that ?? CURRENT BUILDS: 62 BurbMaster Other Builds: My '63 C-10,LWB,CC,BBW '06 HD StrAight Axle Swap Father/Son '67 C-20, LQ9,4L80,Bagged,8-Lugger !!Good Friend Richard's Build AMERICAN CUSTOMS & CLASSICS (831) 630-1965 www.ACCHOLLISTER.com ACC on FACEBOOK "Rest in Peace, Mom & Dad ... I will see you again someday!"

08-16-2007, 10:48 AM	#11
truckn' Registered User Join Date: Aug 2006 Location: rogersville tennessee Posts: 276	Re: Help!!! lots of good info thx alot guys really helps.

08-16-2007, 11:28 AM	#12
hewlett2002000 Registered User Join Date: Dec 2006 Location: Cleveland, Tx Posts: 1,619	Re: Help!!! no im not eliminating the horn. lmao i got an aftermarket horn thats louder so im running that. __________________ Respect: 1. A feeling of appreciative, often deferential regard; esteem. 2. The state of being regarded with honor or esteem. 3. Willingness to show consideration or appreciation. When you fail to show consideration to others values you are showing disrespect.



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