Wiring harness firewall bolt - The 1947 - Present Chevrolet & GMC Truck Message Board Network

MrBeast · 02-07-2013, 11:25 PM

Hey guys I am replacing my dash, need to disconnect my wiring harness, I can't find the right socket to fit on the bolt that holds the under hood harness to the block where it comes through the firewall, anyone know what it is?

dragginmetal · 02-08-2013, 03:59 PM

Mine's 1/4". There's tar like material inside holding it together also. You have to persuade it to come apart even after removing the bolt.

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MrBeast · 02-08-2013, 05:01 PM

I found the right tool, on my 2000 it was a allen head. Thanks though!

**Boog** · 02-08-2013, 08:09 PM

Yeah I ran into that on my 97 GMC. Of all things, an allen head bolt in there instead of a regular hex head bolt. And in a place where you cannot see the bolt, just have to feel for it. That's BS right there.

BigRed89 · 06-10-2017, 08:10 PM

hate to dig up and old thread, but can this harness be separated, for example separate the light harness plug and the engine plug from the connector?
I have installed a carb 350 and want to clean up the wiring that isn't being used
Thanks

02-07-2013, 11:25 PM	#1
MrBeast high-Tech Red Neck Join Date: Feb 2008 Location: Livingston, MT/On my boat WA/BC/AK Posts: 2,294	Wiring harness firewall bolt Hey guys I am replacing my dash, need to disconnect my wiring harness, I can't find the right socket to fit on the bolt that holds the under hood harness to the block where it comes through the firewall, anyone know what it is? __________________ "He used to be a pretty nice feller, now he's a welder!"

02-08-2013, 03:59 PM	#2
dragginmetal here, just not logged in Join Date: Nov 2007 Location: Tx Posts: 1,011	Re: Wiring harness firewall bolt Mine's 1/4". There's tar like material inside holding it together also. You have to persuade it to come apart even after removing the bolt. __________________ Mike 88 GMC "GOT BORED" several truck pics a few '88-'98 pics more pics

02-08-2013, 05:01 PM	#3
MrBeast high-Tech Red Neck Join Date: Feb 2008 Location: Livingston, MT/On my boat WA/BC/AK Posts: 2,294	Re: Wiring harness firewall bolt I found the right tool, on my 2000 it was a allen head. Thanks though! __________________ "He used to be a pretty nice feller, now he's a welder!"

02-08-2013, 08:09 PM	#4
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 12,957	Re: Wiring harness firewall bolt Yeah I ran into that on my 97 GMC. Of all things, an allen head bolt in there instead of a regular hex head bolt. And in a place where you cannot see the bolt, just have to feel for it. That's BS right there. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

06-10-2017, 08:10 PM	#5
BigRed89 Registered User Join Date: Feb 2015 Location: Summerville SC Posts: 11	Re: Wiring harness firewall bolt hate to dig up and old thread, but can this harness be separated, for example separate the light harness plug and the engine plug from the connector? I have installed a carb 350 and want to clean up the wiring that isn't being used Thanks



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