Ls swap wiring

[Graham Cole]

Hey guys! im wondering what everyone would suggest to do wiring wise for a 99 5.3 in my 96. the truck has a 5.0 as of now and im trying to gather parts to get this ls in. what do you guys recommend? im up in Canada. is it hard to create your own harness? or should i buy one? any suggested retailers?
Thanks in advance guys!

 

[michael hurd]

No need to buy a harness. The 1996 vortec harness can be used, with modification of course and addition of a handful of wires.

 

[Graham Cole]

What do I gotta do to convert my harness to run it??

 

[5.3_silverado]

Hey the motor harness. I just got done with my LS swap. Using the factory truck harness and it was a pain.

 

[T0PDOG]

Hi guys , looks like we have The same interest, I've got a 97 Tahoe 2door that has stock engine in it and just got myself a 6.0 engine from the scrap yard , it was sitting in a 2005 Denali , and I'm about to fish out all its wire harness just in case , I know for my install I would need motor plates , rear spacer for the flywheel . But now I'm stuck with the PCM wiring harness , can anyone guide me on the harness bit , because I'm a bit confused , on the net their some cars running with two PCM , I mean the stoke and the installed PCM engine , some say that the original car PCM will be able to run the engine ,and some say to remove the stoke PCM and let the new PCM run the car . Hoping anyone that has some info to help me out


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[Heavychevy408]

Same spot I wanna ditch the black box run a 411 modify the stock harness and keep everything working just need to know if there was a different pcm I could use or is it just the 411 that will make it all work

 

[T0PDOG]

Heavychevy408
I found this site and it my help us both [emoji846]

http://www.gmtruckcentral.com/articles/12200411.html


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[Dylan1991_1500]

Why not run Megasquirt?

 

[T0PDOG]

That's New for me , and it's my first time hearing it from you , thanks I'll look it up

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[Heavychevy408]

Looks good I'll have to look in to it