wiring harness for an LS swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tommymiller090106 · 02-18-2016, 02:59 PM

Hi I'm new to this I'm putting up 5 3 in my 67 short stepside with a 4l60e transmission it's a drive by wire I have all that stuff I need to buy a stand alone wiring harness what do you guys recommend for the best company to go through

**Cash3481** · 02-18-2016, 03:21 PM

Quote:

Originally Posted by tommymiller090106

Hi I'm new to this I'm putting up 5 3 in my 67 short stepside with a 4l60e transmission it's a drive by wire I have all that stuff I need to buy a stand alone wiring harness what do you guys recommend for the best company to go through

PSI
Speartech
BP automotive

All these companies can assist you. and these are just a few.
I would read up on them all first.
Some can give you a new harness
some will remove what isn't needed
some will put your harness and computer on a mocked up motor and tranny to test it
There's a lot of companies that help you...
You just need to measure your risks and capabilities to see where you are at to start.
I wish you luck on your search and look forward to seeing which direction you go.

Mike

Wasted Income · 02-18-2016, 03:33 PM

I had John at Speartech do my first LS swap harness about 10 years ago.
https://www.speartech.com/

I've done my own modified factory harnesses on some, and built harnesses from scratch for some since then.

It's really pretty easy to modify a stock LS harness for stand-alone use.

Wasted Income · 02-18-2016, 03:54 PM

This is a good start for guys wanting to do it themselves. Lots of good info.

http://lt1swap.com/wiringharness.htm

Also, i just remembered that I had BP do a harness for me as well. Quality work, but he has SLOW turnaround in my experience (he's just one guy modifying harnesses)

Wasted Income · 02-18-2016, 04:03 PM

It can get a bit intimidating when you pull all the loom off and dig into it....but it's super satisfying when it fires off for the first time

chevy72blu · 02-18-2016, 04:42 PM

I was very happy with the service I received from PSI.

foamypirate · 02-19-2016, 12:55 PM

I can't recommend BP-Automotive enough. They did a FANTASTIC job on my harness, and the customer support is great. Bill usually personally answers the phone.

All new connectors, has all the position assurance locks, adhesive heatshrink used, fiberglass braid on any wiring by a heat source, true harness tape and friction tape used (not electrical tape), well labeled, etc. I was very impressed.

LS short box · 02-20-2016, 12:52 AM

I've done about 7 LS swaps. One Speartech harness and Howell for the rest. Speartech because they were the first with DBW on a LS3 project.

Howell now because they are a bit less expensive.

Nothing against the other vendors but the convoluted plastic tubing they use for the harness is cheap and looks cheap.

Both Howell and Speartech use the braided wiring covering with enough length that you can tuck it behind the cylinder heads and intake for a cleaner look.

Also consider the fuse block and wiring for final connections. Both Howell and Speartech are well labelled and simple to hook up.

Can't say the same for other vendors I've purchased at less cost and then returned.

I don't work for either just a mechanical hot rodder that lacks much electrical knowledge. For me plug and play means a great deal.

**dec010974** · 02-20-2016, 08:49 AM

Im very frugal. I altered my stock harness. I used the assistance of board members of ls1tech.com and This site. Its not that hard. I managed to Fcuk up a few harnesses along the way, but I learned a lot. Lt1swap.com has a lot of helpful information also. That BP Automotive harness is probably the best harness I've seen. good luck. Clark.

foamypirate · 02-20-2016, 10:14 AM

Quote:

Originally Posted by LS short box

Nothing against the other vendors but the convoluted plastic tubing they use for the harness is cheap and looks cheap.

BP-Automotive will do braided loom if you want. I specifically wanted the convoluted tube for a more OEM looking harness, and for some strange reason, I've never liked the look of braided loom on a wiring warness.

**mongocanfly** · 02-20-2016, 10:55 AM

If you use a factory harness be aware that if you didn't remove it there may be issues..on mine the removers evidently sawed about halfway thru the big part of the harness with a sawzall..then they pulled the convoluted cover back over it...you couldnt tell it until i started pulling it apart....so I went with psi..no complaints..

tommymiller090106 · 02-20-2016, 01:03 PM

Thank you everybody for replying I think I'm going to go ahead and call the guys from BP since I live in Oregon and they're just up the road a couple hours

foamypirate · 02-21-2016, 12:30 AM

Quote:

Originally Posted by tommymiller090106

Thank you everybody for replying I think I'm going to go ahead and call the guys from BP since I live in Oregon and they're just up the road a couple hours

Make sure you've got the right BP. BP-Automotive that does the LS swap harnesses is in Kentucky.

http://www.bp-automotive.com/

clemsonteg · 02-21-2016, 08:45 AM

Here is a poll I started a few months ago. Afterwards I decided to do my own harness. It hasn't been difficult and I like how it's turning out. I figured I would try my hand at it and if I don't like it I can probably sell it and buy a harness from another supplier.

http://67-72chevytrucks.com/vboard/s...d.php?t=689442

02-18-2016, 02:59 PM	#1
tommymiller090106 Registered User Join Date: Aug 2015 Location: st. helens Posts: 8	wiring harness for an LS swap Hi I'm new to this I'm putting up 5 3 in my 67 short stepside with a 4l60e transmission it's a drive by wire I have all that stuff I need to buy a stand alone wiring harness what do you guys recommend for the best company to go through

02-18-2016, 03:33 PM	#3
Wasted Income Boosted Member Join Date: May 2002 Location: Mackinaw, IL Posts: 2,200	Re: wiring harness for an LS swap I had John at Speartech do my first LS swap harness about 10 years ago. https://www.speartech.com/ I've done my own modified factory harnesses on some, and built harnesses from scratch for some since then. It's really pretty easy to modify a stock LS harness for stand-alone use. __________________ 1972 2wd K/5 Blazer Turbocharged 370 LSx - 941 rwhp / 1093 rwtq 1969 Chevy K-10 L33 5.3 / 4L80E / NP241 / 4" lift 1964 Buick Skylark Twin TURBO 383 LS pro-touring project 2014 VW Passat TDI - Daily Driver Turbo diesel 2015 Sierra Denali HD Duramax Turbo diesel 2023 Ford Explorer ST - Twin Turbskis 2023 Ford F150 RCSB - Whipple Supercharged 2017 Polaris RZR Turbo 2014 Nor-Tech Center Console - Twin Supercharged Outboards *TURBO ALL THE THINGS!!*

02-18-2016, 03:54 PM	#4
Wasted Income Boosted Member Join Date: May 2002 Location: Mackinaw, IL Posts: 2,200	Re: wiring harness for an LS swap This is a good start for guys wanting to do it themselves. Lots of good info. http://lt1swap.com/wiringharness.htm Also, i just remembered that I had BP do a harness for me as well. Quality work, but he has SLOW turnaround in my experience (he's just one guy modifying harnesses) __________________ 1972 2wd K/5 Blazer Turbocharged 370 LSx - 941 rwhp / 1093 rwtq 1969 Chevy K-10 L33 5.3 / 4L80E / NP241 / 4" lift 1964 Buick Skylark Twin TURBO 383 LS pro-touring project 2014 VW Passat TDI - Daily Driver Turbo diesel 2015 Sierra Denali HD Duramax Turbo diesel 2023 Ford Explorer ST - Twin Turbskis 2023 Ford F150 RCSB - Whipple Supercharged 2017 Polaris RZR Turbo 2014 Nor-Tech Center Console - Twin Supercharged Outboards *TURBO ALL THE THINGS!!*

02-18-2016, 04:03 PM	#5
Wasted Income Boosted Member Join Date: May 2002 Location: Mackinaw, IL Posts: 2,200	Re: wiring harness for an LS swap It can get a bit intimidating when you pull all the loom off and dig into it....but it's super satisfying when it fires off for the first time __________________ 1972 2wd K/5 Blazer Turbocharged 370 LSx - 941 rwhp / 1093 rwtq 1969 Chevy K-10 L33 5.3 / 4L80E / NP241 / 4" lift 1964 Buick Skylark Twin TURBO 383 LS pro-touring project 2014 VW Passat TDI - Daily Driver Turbo diesel 2015 Sierra Denali HD Duramax Turbo diesel 2023 Ford Explorer ST - Twin Turbskis 2023 Ford F150 RCSB - Whipple Supercharged 2017 Polaris RZR Turbo 2014 Nor-Tech Center Console - Twin Supercharged Outboards *TURBO ALL THE THINGS!!*

02-18-2016, 04:42 PM	#6
chevy72blu Registered User Join Date: Apr 2004 Location: Las Vegas, NV Posts: 2,188	Re: wiring harness for an LS swap I was very happy with the service I received from PSI. __________________ RIP EastSideLowLife '72 C20 SWB convert. 5 lug, LS1/4l60e

02-19-2016, 12:55 PM	#7
foamypirate Registered User Join Date: Apr 2009 Location: Pflugerville, TX Posts: 594	Re: wiring harness for an LS swap I can't recommend BP-Automotive enough. They did a FANTASTIC job on my harness, and the customer support is great. Bill usually personally answers the phone. All new connectors, has all the position assurance locks, adhesive heatshrink used, fiberglass braid on any wiring by a heat source, true harness tape and friction tape used (not electrical tape), well labeled, etc. I was very impressed.

02-20-2016, 12:52 AM	#8
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 2,132	Re: wiring harness for an LS swap I've done about 7 LS swaps. One Speartech harness and Howell for the rest. Speartech because they were the first with DBW on a LS3 project. Howell now because they are a bit less expensive. Nothing against the other vendors but the convoluted plastic tubing they use for the harness is cheap and looks cheap. Both Howell and Speartech use the braided wiring covering with enough length that you can tuck it behind the cylinder heads and intake for a cleaner look. Also consider the fuse block and wiring for final connections. Both Howell and Speartech are well labelled and simple to hook up. Can't say the same for other vendors I've purchased at less cost and then returned. I don't work for either just a mechanical hot rodder that lacks much electrical knowledge. For me plug and play means a great deal.

02-20-2016, 08:49 AM	#9
dec010974 Senior Member Join Date: Oct 2012 Location: Miami, Florida Posts: 959	Re: wiring harness for an LS swap Im very frugal. I altered my stock harness. I used the assistance of board members of ls1tech.com and This site. Its not that hard. I managed to Fcuk up a few harnesses along the way, but I learned a lot. Lt1swap.com has a lot of helpful information also. That BP Automotive harness is probably the best harness I've seen. good luck. Clark.

02-20-2016, 10:55 AM	#11
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,671	Re: wiring harness for an LS swap If you use a factory harness be aware that if you didn't remove it there may be issues..on mine the removers evidently sawed about halfway thru the big part of the harness with a sawzall..then they pulled the convoluted cover back over it...you couldnt tell it until i started pulling it apart....so I went with psi..no complaints..

02-20-2016, 01:03 PM	#12
tommymiller090106 Registered User Join Date: Aug 2015 Location: st. helens Posts: 8	Re: wiring harness for an LS swap Thank you everybody for replying I think I'm going to go ahead and call the guys from BP since I live in Oregon and they're just up the road a couple hours

02-21-2016, 08:45 AM	#14
clemsonteg Registered User Join Date: Jul 2012 Location: Anderson,SC Posts: 953	Re: wiring harness for an LS swap Here is a poll I started a few months ago. Afterwards I decided to do my own harness. It hasn't been difficult and I like how it's turning out. I figured I would try my hand at it and if I don't like it I can probably sell it and buy a harness from another supplier. http://67-72chevytrucks.com/vboard/s...d.php?t=689442



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