LS1 Engine Harness and A/C Bracket??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Blue85 · 01-13-2007, 12:42 AM

Well guys the LS1 bug has bit me once again, has anyone ever found a wiring diagram for a DIY wiring harness conversion, instead of paying someone 400 bucks to do it. Also, what about a bracket to remount the A/C compressor (Sanden 508 with Vintage Air) to the top side of the engine without spending a 1000 bucks on brackets?

shifty · 01-13-2007, 12:58 AM

sign up at Ls1tech.com. Yes, the wiring layout can be found there in the "Conversions and Hybrids" forum. Brackets - $50 - fab your own out of 1/4" steel.

Have fun with that harness. There's a reason people pay a couple hundred dollars to do it. For the record, I got both my harness worked out AND the PCM reprogrammed for less than $400. Wait4me Performance. Good work, poor communication, and I still need to do some of the wiring to add relays, fuses and other stuff. You skimp on $$$ you suffer with this swap. The more money you put into it, the less headaches you have and the less chance for chasing down gremlins later.

Good luck.

longhorn71 · 01-13-2007, 01:40 AM

I just got the painless wiring harness for the ls1 for $750 canadian and i thought that was not bad.I have not got it yet but it took real easy to do.

Deuce · 01-13-2007, 03:01 PM

I didi the painless TPI harness for my first FI swap and it was simple.

BigTex · 01-13-2007, 04:04 PM

I'm going to just modify the stock harness myself. I'm not sure if I'm going to run an electric throttle body or manual, but I have a harness for each style. That way I have full control of where I mount the PCM and have just the right length on each of the connections. From everything I've seen, the bought harnesses aren't just loaded with extra features and still take plenty of time to make functional.

I agree with shifty on the brackets, if the stock GM bracket from the vette, camaro, gto, or trucks don't work for your needs, make your own.

meathead95 · 01-13-2007, 06:47 PM

here is a website for brackets http://www.alangrovecomponents.com/

**N2TRUX** · 01-13-2007, 07:14 PM

Right up front we need to clear this up. No matter who does the work, and LS-1 conversion is not cheap. If your looking for an economical conversion this is not for you.

You can modify the harness yourself, but who's going to program your computer?

You can also modify the stock brackets to clear the frame rails or build your own. Regardless it's not easy or cheap but it is s good conversion if you do it right...

BigTex · 01-13-2007, 09:36 PM

I know most of you will just want to get a 'canned' program for your truck, make it run, and never look back. I'm not from that mold. I'd personally rather have the ability to make changes as needed to my program. I'm sure that the idea of tuning your own stuff will make some people uneasy. I can honestly say that its not too difficult and the rewards are great.

That said, EFILive is in my opinion the best product on the market. I've use it to tune a couple of my nitrous and supercharged trucks and my supercharged Tahoe, a friends 98 Camaro, a buddy's 06 Duramax, etc... Its been invaluable.

01-13-2007, 12:42 AM	#1
Blue85 Oilfield Trash Join Date: Sep 2003 Location: Raymore, Sk, Canada, Earth Posts: 3,171	LS1 Engine Harness and A/C Bracket??? Well guys the LS1 bug has bit me once again, has anyone ever found a wiring diagram for a DIY wiring harness conversion, instead of paying someone 400 bucks to do it. Also, what about a bracket to remount the A/C compressor (Sanden 508 with Vintage Air) to the top side of the engine without spending a 1000 bucks on brackets? __________________ 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. Last edited by Blue85; 01-13-2007 at 12:45 AM.

01-13-2007, 12:58 AM	#2
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: LS1 Engine Harness and A/C Bracket??? sign up at Ls1tech.com. Yes, the wiring layout can be found there in the "Conversions and Hybrids" forum. Brackets - $50 - fab your own out of 1/4" steel. Have fun with that harness. There's a reason people pay a couple hundred dollars to do it. For the record, I got both my harness worked out AND the PCM reprogrammed for less than $400. Wait4me Performance. Good work, poor communication, and I still need to do some of the wiring to add relays, fuses and other stuff. You skimp on $$$ you suffer with this swap. The more money you put into it, the less headaches you have and the less chance for chasing down gremlins later. Good luck. __________________ 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.

01-13-2007, 01:40 AM	#3
longhorn71 Senior Member Join Date: Sep 2004 Location: CANADA Posts: 1,681	Re: LS1 Engine Harness and A/C Bracket??? I just got the painless wiring harness for the ls1 for $750 canadian and i thought that was not bad.I have not got it yet but it took real easy to do.

01-13-2007, 03:01 PM	#4
Deuce Registered User Join Date: Apr 2004 Location: Calgary, Alberta,Canada Posts: 1,595	Re: LS1 Engine Harness and A/C Bracket??? I didi the painless TPI harness for my first FI swap and it was simple. __________________ I know what your thinking.......I have ESPN. Sometimes it's easier to do things the hard way. Fesler Built 1968 Chevy C10....Must resist the urge to mess with it!!

01-13-2007, 04:04 PM	#5
BigTex Registered User Join Date: Nov 2006 Location: DFW area Posts: 104	Re: LS1 Engine Harness and A/C Bracket??? I'm going to just modify the stock harness myself. I'm not sure if I'm going to run an electric throttle body or manual, but I have a harness for each style. That way I have full control of where I mount the PCM and have just the right length on each of the connections. From everything I've seen, the bought harnesses aren't just loaded with extra features and still take plenty of time to make functional. I agree with shifty on the brackets, if the stock GM bracket from the vette, camaro, gto, or trucks don't work for your needs, make your own.

01-13-2007, 06:47 PM	#6
meathead95 computer illiterate Join Date: Jan 2001 Location: Des Moines, IA Posts: 6,446	Re: LS1 Engine Harness and A/C Bracket??? here is a website for brackets http://www.alangrovecomponents.com/ __________________ 72 2wd blazer 72 swb 4x4

01-13-2007, 07:14 PM	#7
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,023	Re: LS1 Engine Harness and A/C Bracket??? Right up front we need to clear this up. No matter who does the work, and LS-1 conversion is not cheap. If your looking for an economical conversion this is not for you. You can modify the harness yourself, but who's going to program your computer? You can also modify the stock brackets to clear the frame rails or build your own. Regardless it's not easy or cheap but it is s good conversion if you do it right... Attached Images __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

01-13-2007, 09:36 PM	#8
BigTex Registered User Join Date: Nov 2006 Location: DFW area Posts: 104	Re: LS1 Engine Harness and A/C Bracket??? I know most of you will just want to get a 'canned' program for your truck, make it run, and never look back. I'm not from that mold. I'd personally rather have the ability to make changes as needed to my program. I'm sure that the idea of tuning your own stuff will make some people uneasy. I can honestly say that its not too difficult and the rewards are great. That said, EFILive is in my opinion the best product on the market. I've use it to tune a couple of my nitrous and supercharged trucks and my supercharged Tahoe, a friends 98 Camaro, a buddy's 06 Duramax, etc... Its been invaluable.



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