LS Swap wiring diagram - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sixty4bigwindow · 01-10-2018, 02:05 PM

Hey fellas, so I've found a few different LS swaps available that are complete with motor trans and harness. The one I'm leaning towards has the flashed ECU, DBC, and set up for the "2 wire" I believe it's called. M

My question is if it is a literal 2 wire setup. We had a wiring harness installed from Qwik Wire a couple years ago, so it is all updated wiring. I'm just kinda wondering what is going to connect to what with a setup like that.

tinydb84 · 01-10-2018, 04:33 PM

Its been a bit since I did my brother's wiring but it was three wires (four if you count the fuel pump).

1. Wire to the fuse block that was hot when key on.
2. Wire to the starter.
3. Ground.

I think that was it if I remember correctly.

sixty4bigwindow · 01-10-2018, 05:35 PM

Quote:

Originally Posted by tinydb84

Its been a bit since I did my brother's wiring but it was three wires (four if you count the fuel pump).

1. Wire to the fuse block that was hot when key on.
2. Wire to the starter.
3. Ground.

I think that was it if I remember correctly.

Ok that's kinda what I assumed for the short harness. And then the rest of it is just the wires from the computer to the injectors and sensors etc. correct?

sixty4bigwindow · 01-10-2018, 05:38 PM

There's a guy I follow on IG who lives in Salinas that sells complete swaps with the 3 wire harness for a reasonable price. 99k to 115k miles on them, see them running. He's in your area Tiny!

tinydb84 · 01-10-2018, 05:38 PM

Yes

tinydb84 · 01-10-2018, 05:43 PM

Quote:

Originally Posted by sixty4bigwindow

There's a guy I follow on IG who lives in Salinas that sells complete swaps with the 3 wire harness for a reasonable price. 99k to 115k miles on them, see them running. He's in your area Tiny!

Ive talked to him before. Pacific fab in Gilroy who is on here too does the same. Whats your instagram name?

sixty4bigwindow · 01-11-2018, 02:14 PM

Quote:

Originally Posted by tinydb84

Ive talked to him before. Pacific fab in Gilroy who is on here too does the same. Whats your instagram name?

big_red_the_2nd

Follow me and I'll follow back!! That's awesome, what is his IG name if he's on there??

doug_p · 01-22-2018, 11:16 PM

check out LT1swap.com the guy has everything you need on his page, easy to follow, easy to do . . . covers everything - which wires to keep, which to eliminate, how to make the fuse panel needed - it is an excellent resource for swapping LS engines, even though it is called LT1 swap.

01-10-2018, 02:05 PM	#1
sixty4bigwindow Registered User Join Date: Feb 2016 Location: BACK in Southern Oregon... Don't ask Posts: 151	LS Swap wiring diagram Hey fellas, so I've found a few different LS swaps available that are complete with motor trans and harness. The one I'm leaning towards has the flashed ECU, DBC, and set up for the "2 wire" I believe it's called. M My question is if it is a literal 2 wire setup. We had a wiring harness installed from Qwik Wire a couple years ago, so it is all updated wiring. I'm just kinda wondering what is going to connect to what with a setup like that. __________________ Been a crazy 2018. Moved twice, back HOME in Oregon. Now to put everything back together, including the truck... My build thread for "Rocket" - http://67-72chevytrucks.com/vboard/s...d.php?t=753023

01-10-2018, 04:33 PM	#2
tinydb84 Registered User Join Date: Jul 2009 Location: San Jose Ca Posts: 2,871	Re: LS Swap wiring diagram Its been a bit since I did my brother's wiring but it was three wires (four if you count the fuel pump). 1. Wire to the fuse block that was hot when key on. 2. Wire to the starter. 3. Ground. I think that was it if I remember correctly. __________________ David Used parts build: http://67-72chevytrucks.com/vboard/s...d.php?t=638991 My brother's Nova: http://www.67-72chevytrucks.com/vboa...d.php?t=727985 Rear suspension rework: http://www.67-72chevytrucks.com/vboa...d.php?t=750557 Instagram: myfabguy

01-10-2018, 05:38 PM	#4
sixty4bigwindow Registered User Join Date: Feb 2016 Location: BACK in Southern Oregon... Don't ask Posts: 151	Re: LS Swap wiring diagram There's a guy I follow on IG who lives in Salinas that sells complete swaps with the 3 wire harness for a reasonable price. 99k to 115k miles on them, see them running. He's in your area Tiny! __________________ Been a crazy 2018. Moved twice, back HOME in Oregon. Now to put everything back together, including the truck... My build thread for "Rocket" - http://67-72chevytrucks.com/vboard/s...d.php?t=753023

01-10-2018, 05:38 PM	#5
tinydb84 Registered User Join Date: Jul 2009 Location: San Jose Ca Posts: 2,871	Re: LS Swap wiring diagram Yes __________________ David Used parts build: http://67-72chevytrucks.com/vboard/s...d.php?t=638991 My brother's Nova: http://www.67-72chevytrucks.com/vboa...d.php?t=727985 Rear suspension rework: http://www.67-72chevytrucks.com/vboa...d.php?t=750557 Instagram: myfabguy

01-22-2018, 11:16 PM	#8
doug_p Registered User Join Date: Sep 2014 Location: Yorktown, VA Posts: 95	Re: LS Swap wiring diagram check out LT1swap.com the guy has everything you need on his page, easy to follow, easy to do . . . covers everything - which wires to keep, which to eliminate, how to make the fuse panel needed - it is an excellent resource for swapping LS engines, even though it is called LT1 swap.



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