2003 Vortec 5.3L Wiring Harness Rework Part 1

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This will be my first video of three parts, going over the harness rework steps for a 2003 5.3L vortec engine. In part 1, I will depin unused wires from the PCM as well as identify wires that will be used in the fuse block, or connected elsewhere in the target vehicle. This process will be nearly identical for any 2003-2007 Gen 3 engine with electric throttle control, with 4L60E or 4L80E trans. For more wiring details, please visit my website, www.lt1swap.com
Download Printable PDF Files of the pin outs I use from my website here:
www.lt1swap.com...
www.lt1swap.com...
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4 окт 2024

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Комментарии : 279

@michaelwittke8336 2 года назад

Thank you for not cutting this short. You were kind and decent enough to provide this information, I (for one) am more than happy to view it in its entirety

@derekhansen6652 6 лет назад

Your site has been such a huge help for so many peoples swaps, I feel like you have had a profound effect on the ls base popularity, even if they are plentiful at junkyards and reasonably priced.... They aren't any good without the electrical side which is everyones weakpoint, except yours😎. Keep up the awesome work you are doing to help the car guys out there. and thanks

@Good-Enuff-Garage 5 лет назад

ah yes the hands of the LS Swap god at work

@miatajackdiy4293 2 года назад

I sent an email with a question to Brandon and he got back to me, I can't believe with all he's got going on that he could actually find the time to respond. I didn't want to send an email back saying 'thanks' because it would be just another email for him to open. So I'll say it here...Thank you Brandon. I'm doing a Ls swap Miata and needed to delete the transmission wiring. My L33 5.3 aluminum block is an '05. He explained that on the pin-out for '99 - '02 he has the transmission delete highlighted in red. Same engine basically but I didn't check...lol.

@jimekrut 4 года назад

Amazingly detailed and informative. Thank you for talking through and demonstrating the modifications!

@7beast298 2 года назад

I love this guy! Built my first ls swapped project with just your info on your site about 5yrs ago and you kick ass man glad u have videos now 💪🤙

@mojojojo3361 2 года назад

I’m up now learning lol!

@lprojecxa1stcustomz686 6 лет назад

Thanks for my programming man my truck runs great Lt1 swapped S10 Sonoma. Looking forward to some more of your services with my ls swaps 💪💪💪

@Markstarscoobs 4 года назад

Followed your guide and wow it was simple at first it didnt make sense to my brain but I trusted the process and an hour later I'm almost done and cleaning it up. Thanks

@Lordspaghett 4 года назад

Used the pinout sheet you made for the 1999-2002 harness yesterday, thanks so much for the info!!

@ls87gbody 6 лет назад

Best most informative, detailed and to the point ls wiring video on the tube! Thank you sir for taking ypur time to do this video and share it with us.

@frederickwalton8410 6 лет назад

This is great!!! I'm doing a 5.3 LS 4L60E 2WD swap to a '84 ElCamino using a '03 5.3 LS with DBW. These vids are going to make the job a shit ton easier. I can pretty much follow along bieng in "real time" . I've used his info in the past and it is Rock Solid!!! Thanx again Brendan

@mattbengry7460 5 лет назад

Thank you for the videos. I was shown using a seam ripper from a fabric store to cut through tape or braiding on a wiring harness works wonders.

@glenncattani4843 3 года назад

I've been referencing your site for years and never noticed the youtube links or vids. Great stuff. Great resource!!! Thanks.

@atlas5651 5 лет назад

Best most helpful youtube video ever created.

@armando43mmoralesrd76 4 года назад

Everytime I get to watch this video I just can't stop watching finally someone who explain step by step and doing things at the same time and I have a ? Do you do this for any person if so let me know thanks

@vandettabuilds6641 4 года назад

What a great service you have given the LS swap community. I just recently bought a 92 camaro I am doing a ground up resto Every is using your info for the wiring harness!!! Thank you!!!! Check out my build.

@quarter_bubble_garage4946 6 лет назад

Excellent video! Thank you for all the information you share helped me a ton during my swap.

@ezelk1337 5 лет назад

Thank you again. This is the best video that I have seen on this. You are the man!

@luctessier2215 6 лет назад

Thanks Brandon for the video. Always great info

@TheSaxon25 3 года назад

your choice of cold snack sparks joy.

@CLASSICSAREBETTER 2 года назад

This is super useful info, thanks man, this must have been tedious to record etc.

@justinw523 5 лет назад

Man your smart! I was going to have someone do this for my '88 MCSS gbody LS swap cause I hate wiring but long as I have the harness and wire chart I should be okay? I'm running a LS1 with 4L60E and using all my stock gauges, the car will look 100% original until you pop the hood. Thank you for the inspiration

@izaakbennett9482 6 лет назад

I’m putting a 5.3 with 4l60e on a small lawn tractor nickname “Death Tractor”

@dennisalstonZ06 3 года назад

The Blue wire on a 03 flex fuel harness from the Alternator you can use it for your aftermarket tech anh it works 👍

@robertnelson9505 3 месяца назад

Thanks for the great information

@Woods_performance 6 лет назад

Thanks a lot! you just saved me $800 if i did it right lol

@rawdoggarage9977 6 лет назад

Great video, thanks for the upload.

@jonvanpelt5861 6 лет назад

Thank you for making the video

@ranchogutierrez5139 6 лет назад

respect

@jackthompson1382 6 лет назад

Bonus points for eagles in the background.

@maxhertz8053 4 года назад

Well i was om the fence of doin ls swap to my 77c10. See you got the dr pepper flowin and thats all the convincing i needed. Haha this guy knows whats up people.

@y5mgisi 4 года назад

Thank you so much for all you do!

@1vernl1 6 лет назад

Thank you so much for this video

@davidcasey6181 3 года назад

I noticed on your chart in connector C1 that pin 56 is not labeled. The print that I have is labeled yellow. Thanks for the great work.

@amrikjaswal76 5 лет назад

Hi...thanks for the great videos....if I was going to use a th400 instead of the stock 4l60e with ls1, which pi s do I remove out of the harness...my motor and harness is out of 2002 Corvette. Thank you

@davebarron5939 5 лет назад

VERY educational, simple but "involved" you mention 03 "up" there is no AC control through computer, did I hear wrong? I am doing a 04 LQ9 in my running but rusty 3500 Van (with AC) and swapping into 83 camaro with AC. Your information and amazing sharing is truly a selfless act. THANKS!

@LT1SWAPCOM 5 лет назад

The physical a/c request wire can be turned on in the PCM. Only PCM's that support mechanical throttle (DBC) have the necessary circuit inside the computer for this to work. 03+ pickups a/c request is a data signal over the data bus. 03+ vans used a physical wire, 12V+ signal into the computer to request ac.

@dlawson8993 4 года назад

Nice job thank's for the help..

@dennisalstonZ06 2 года назад

On the blue Connector you miss pin 35 gry wire cpp switch signal (mt ) I'm working on 03 hardness .

@jblong5373 Год назад

on the LS1 Vega shown on You tube by marc Ramos,did you ever find out what motor mounts,headers and oil pan he used ? I have a 1975 that I plan to put a 6.0 in it.

@aidenlopez5249 4 года назад

Can I use this video to ls swap my 93 Silverado 1500

@bbbk53 4 года назад

props, rewiring now

@iamgoat3035 3 года назад

so is this for a swap that will keep the stock LS computer , intake and fuel injection system?

@ryanjohnson2614 4 года назад

amazing videos man!

@Jones4Dragon 6 лет назад

Hi I'm putting a 2006 Silverado ls swap in my c10. the question I have for you is when removing the stock harness to the truck will the DBW pedal wire be in the moter harness? I bought a donor truck and im striping it for the motor I was hoping that the pedal wire will connect to the motor harness not the cab side harness? thankyou for these great videos and you time to read this and help me

@miguelortega7799 5 лет назад

Thanks for the post, 3 questions for clarification regarding the pin outs. I'm swapping using T5 manual trans. Do I need Tcc brake signal? Since it will be a manual trans I assume I can remove all automatic trans wiring even if not highlighted? What can you recomend for vss sensor on T5? Thanks

@MrFaberjr 2 года назад

Thanks for the video and your online content. I looked through your site and I may have missed it, but I can’t seem to find anything on a manual transmission like a T-56. Or does the ECU not interact with a manual transmission? 2007 6.0 btw.

@kevinc9934 5 лет назад

is this much different than a 6.0 drive by wire set up?

@crcconstructioninc.4483 5 лет назад

Kevin Camacho I’m in here for the same reasons

@domingoclaudio2729 6 месяцев назад

I just picked up an engine 6.0 L9 block with a 6L90 transmission where can I get the harness modified for my 1981 Chevy Monte Carlos.

@Juicesquaredchevy 4 года назад

At the end says cruise control totally optional. O think like 3 wires. If you don’t want it do you just pull it out like the other unnecessary wires?

@dkelley4177 4 года назад

P.S....My 4L60 is already wired up in OEM Harness. Not to sure what the Computer will think of my 231C manual shift Transfer Case(I did put the speed sensor in it).

@hamedalbeajan3783 2 года назад

I have a 6 litre engine 2005, and I want to put it in a 1987 GMC Sierra. How would I go about this?

@dkelley4177 4 года назад

I might be insane. but my 2000 Blazer has most of Sensors for LS.I need injector, coil pack.cam pos. sensor, knock sensor,and second cat sensor. I might need longer leads for alternator. I am considering a "mini harness" to travel with my OEM harness. At plug's I could re-pin to Trailblazer SS locations. I know this might sound crazy, but I think it might work out well. I would appreciate the opinion of the Master. Thanks for all You do.

@robertparker6041 4 года назад

Does this also work for a 2005 chevy Silverado it has a electric throttle body and gas pedal first time doing this help much needed

@gerardolopez5875 3 года назад

Yes

@chriscorum7266 4 года назад

Does the fan wire u saved have to go to relay or can it go directly to fan

@gerardolopez5875 3 года назад

Relay

@ralphsmith4432 6 лет назад

I was wondering do you do the harness also with flashing the pcm can I send my harness and pcm to you ?

@chriskingery3555 5 лет назад

curious about this as well

@Tinman2Kustoms 4 года назад

@@chriskingery3555 also curious about this.

@purefukree7507 8 месяцев назад

Can I remove all of the wires labeled “(A/T)” on the chart if I am running a drive by wire manual transmission setup?

@ricardoparra6927 3 года назад

Thank you for creating this amazing resource! I am in the middle a swapping a Gen III 5.3 w/ 4L60E. I am in the research phase attempting to determine how much functionality I can retain. One thing I have asked in multiple forums is regarding the instrument cluster but haven't found anything useful. is it possible to keep the donor vehicle's instrument panel cluster?

@hudsonauto13 Год назад

Yes im using the oe sensors and runing paralell

@tommyjm83 6 месяцев назад

Question the pin. 33 the ppl wire that runs the tcc lock up. It's still in my black c2 connector on the factory fuse box that I'm using. When I wire up the brake switch the ppl wire to tap into that wire? Or do I take it out of the black connector?

@SuperCcohen Год назад

So if we are not using the auto trans do we just eliminate everything associated with the a/t

@marcocasillas5023 6 лет назад

Thank you for all your information on wiring harnesses makes doing the engine swaps easy I'm now working on a Chevy Cobalt SS supercharged 2 L do you have any videos on that or pinout and can you do the computer if I send it to you I'm putting it in a Baja Bug thanks again for all the information you give us

@longhorn8459 5 лет назад

For clarity sake, this entire process is intended to remove wire bulk correct? Or does it serve a functional purpose?

@chevycaprice8956 5 лет назад

Do i have to have the harness that came with the motor or can i use one from another motor but same Year

@offensivetomato2294 4 года назад

no you do not. I am using a random harness for engine as long as it's from the same time period like 1999-2002 or 2003-2007.

@franciscolara8359 10 месяцев назад

You guys know, if I can I put a 2011 5.3 Silverado harness in a 2008 tahoe 5.3 block and transmission with a 4L60E?

@rcarrillo331 3 года назад

Thank you for the videos. Im swapping a 2001 5.3 dbw and when i cut all the wires but pinks out of the fuse block i have about 4 wires hanging loose from my tac module plug what to i do with those? Are they needed? If so where do i run them?.any info or direction is much appreciated.

@jacobgarci1023 2 года назад

What about the orange hi-lighted ones

@r3d1911 3 года назад

Question. When your adding pins to say where the fan goes why not just reuse one of the other wires you've already taken out instead of making a entire new wire? Is that ok to do?

@ericandrade7237 6 лет назад

We all love you ! Thanks lol

@6xcchamber971 4 года назад

LT1 thanks for your videos, I am about to rework a 2002 ls 5.3 using your chart. I am putting it in a 95 mustang With a turbo. On the website it says that "if you will need to use 4 oxygen sensors or Evap system that you should hot remove them". From yours and other videos I understand how to remove the pins and work the wires out, I just don't know exactly which wires to remove. Could you please help? I have posted on other sites with no reply. Thank you, Brad

@whynotbedannyh 5 лет назад

Is it the same process for the harness of an 01 lq4 6.0?

@jakehuse5669 8 месяцев назад

Where can i find the wiring diagram like you have on paper

@mycardiaz 3 года назад

Could you please answer this question everything in this video what you have on your two sheets that is highlighted in yellow and blue is that what gets eliminated from the harness

@robertfarris3085 5 лет назад

Does anyone have the wiring diagram for the white C150 wiring or know a link to the information?

@toddmathison7517 5 лет назад

I'm going to ask a dumb question. Why can't I use the entire harness minus the gauge and climate stuff? I got all the fuse blocks and relay box. If I just tape off what I don't use would that work?

@omanturbo 6 лет назад

I am working on a swap on my gmc 98 5.7 vortec to lq9 My interiors will be swaped too to nbs , for my ac wiring can i use my old harness or i must do an initial wiring for each pin..ill be happy to hear back from you ...

@ELPATRON839 5 лет назад

Great videos by the way ! Do you flash ecu ‘s and how much do you charge ?

@LT1SWAPCOM 5 лет назад

I sure do, www.lt1swap.com/programming.htm

@nope2u399 3 года назад

I have an 03 Express van harness and relay box is it the same keyed power c1-a9 as the truck relay box to power up everything???

@philliptaylor4041 3 года назад

The wires that go to fuel injector can u splice to make longer or do i need to replace whole wire to make longer

@jackg5094 2 года назад

I have a '05 L33 5.3 aluminum block high output truck engine and it has all the wiring for the duel tank set-up. My question, can I use the PCM signal wirefor the duel tanks for my second fuel pump in my Miata swap. Does the PCM signal run the pump all the time or is it switched by the operator to go over to secondary tanks when needed. Thx.

@jacobgarci1023 3 года назад

Will this work on a 2004 vortec 5.3l

@chriscase6341 3 года назад

40 people didn't want U to show us that. Lol

@brendonkamp1186 5 лет назад

I got my 6.0 out of a 2004 Chevy express 3500 and my wiring harness is different in a couple of days from any type or rework diagram you have shown on your website or that I've found period on the web or RU-vid for that matter..

@brendonkamp1186 5 лет назад

There was a few pinouts that we're different

@Codypfleidner 5 лет назад

The tan wires that go to the from 02 sensors to pcm. Do they need to be case grounded also even though they go to pins 26&29 on the blue connector? It’s an 03 harness and pcm just like that one.

@xRSAkingx 5 лет назад

The purple started solenoid wire... would I run an extra relay for the starter? I don't see a starter relay in your custom fusebox walkthrough on the website

@jameslogan454ZZ 4 года назад

Im 20p3 5.3 ls swaping in to a 1095 GMC 3500 dulley that had a 6.5 turbo desoil in it so my swap a lil more than just wireing But does your page have a wire schematics for a 1995 GMC 3500 C in the vin because i want to wire the 6.5 i pulled out in my boat 😆 and drop 5.3 ls in the 95 gmc 3500 dulley 😆

@colbylange9282 3 года назад

Why did you skip doing anything with Pin BLUE 35 (CPP switch signal)? It's marked in blue, was that a mistake?

@AllThingsQuick 6 лет назад

I got a 5.3l vortec from a 2001 chevy 1500. That's the LS based model, just wondering if this is the exact same thing? Or is the LT and LS different? I don't wanna screw anything up. Please let me know.

@jamest.5001 4 года назад

Would it be possible or difficult to add flexfuel to a swap? I'm stuck in the 70's and looking to make the leap to the 21'st century! The newest vehicle I owned was a 92, Chevy truck, I swapped in a 454, I just bought a 96 S15, I want to swap in a 05 or so 4.8L. Engine and trans, or would the v6 4L60 be OK? I'm thinking just swap the engine and trans, with standalone ECU TCM, I guess connecting the stock harness for the gauges would work?

@rockabichebel 3 года назад

hello how are you plz i have hummer h3 2006 v5 3.5 l with E40 ECM if i find v8 gn4 with E67 Ecm and harness i can put it on my h3 and work properly all gauges and ABS and traction control? and transmission sure i wanna make changes in th. 4l60 to v8 ... o r other E C M?

@geraldcly3466 6 лет назад

Where can I get a copy to print the paper your using to remove the pins / wiring

@LT1SWAPCOM 6 лет назад

www.lt1swap.com/1999-02pcmpinouts.pdf www.lt1swap.com/2003-07pcmpinouts.pdf

@raythomasson8660 3 года назад

If I go carbed I should only need coils and ???

@METROTMEN 6 лет назад

I’m using a 2001 5.3 for my swap and converting to DBC. Can you link me to the wiring and removing of the TAC and cruise control? I saw someone on here had the same question but it was for a 03-07 and the link said it was strictly for that not 99-02.

@jessesumrall2449 3 года назад

I’m missing one of the blue plastic covers for the PCM connectors. Any idea where I could get one?

@Bizego_innovations 5 лет назад

question towards the factory sarvc plug wires, looking for the location to the blue wire. did a rewire and cant find a location. its in a stock factory truck. any help is appreciated

@twiztedbacon 5 лет назад

this would work for the 2004 4.8 correct even if it has the drive by wire for accelerator

@ScottsChaos 2 года назад

It appears that this method is for swaps in older vehicles. Im putting an LM4 into a 99 firebird. Am I correct to assume my harness would be different?

@LT1SWAPCOM 2 года назад

In that situation, I would find a v8 harness for a 99 f-body and it would plug in. This method could still be used to get the LM4 running, then all you have to connect between the LM4 harness and the 99 are wires for stuff like check engine, fan controls, data wires, key hot signal. The fuse block on a f-body was part of the forward lamp harness, so all the powers needed will be found in the C100, C105 connectors on the passenger inner fender and kick panel area.

@ScottsChaos 2 года назад

@@LT1SWAPCOM awesome! Thank you!

@nicksee7550 6 лет назад

At 48:57, referring to the cruise control wiring. I have an ‘03 lq4 and 4l80e van harness that is drive by cable. I have all the wires from the fuse block identified except for two pink wires and two dark green wires that both run to the top connector on the park/neutral safety module. Would these wires be for my cruise?

@jacob2valid370 6 лет назад

How much do you charge to do a Stan alone harness I have a 98 c1500 with a 4.3 going to put a 5.3 out of a Yukon xl 1500

@MANDSMANDS-ei6so 4 года назад

Has anyone ever used the computer out of a 2004 express van.i looked up the pin outs on lt1swap.com but couldnt find anything that had the same colors or pins.