LS Standalone Harness 101 Beginners Guide | HOW TO Wire a LS Swap Hotrod Engine

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This time on SPPTV I do my best to pass on the knowledge I have gained through the years building over 20 stand alone LS wiring harnesses. I am no professional and you should do your own research before jumping into a project like this, but I have never had any problems.
Re-Wiring a stock GM truck wiring harness is intimidating if you are new to this kind of thing, but it is relatively simple if you follow some steps. The best advice I can give is to do things in sections. Focus on one part of the wiring harness at a time and then tape it up, put it to the side, etc. .
In this video I show how you can convert a factory Silverado wiring harness to be used in a LS swap vehicle of any type. I cover the pcm connectors and de pinning. Removing connectors and un-needed wires. Power wires and which wires to connect to outside sources, and more.
Check out my video I made on HP Tuners
• HP Tuners 101 Beginner...
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3 авг 2024

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Комментарии : 206

@bishop5166 5 лет назад

This might be the best detailed hands on harness set up ever. I'll be saving this video and using it as a step by step reference. Thanks.

@chevycaprice8956 5 лет назад

You should check out lt1 swap he is a master at this

@SPPTVarmy 5 лет назад

I learned a lot in the begining from him. - Mike

@sethhill19791979 4 года назад

its a keeper

@travis3688 4 года назад

Will this work for a blu/green harness to a red green ecu?

@SPPTVarmy 3 года назад

We dont do it for other people, sorry.

@ThatGuyFromArizona 5 лет назад

Well done Mike. Harnesses were always a challenging and fun project when I built cars.

@tinman9341 4 года назад

Great work guys!!!! I’ve been doing some research for a future project and this is extremely helpful!!! Keep up the great work!👍🏼👍🏼👍🏼

@hillbillygarage1270 3 года назад

A lot of good info here. Definitely seems less daunting than I imagined. May have to give this a shot for my dad's 1938 Ford Coupe ls swap.

@raj9223 5 лет назад

Great video man, makes me feel alot more confident in my new harness !!!

@baggedmazda666 5 лет назад

Best thing I have found to removing the plastic loom and tape is a sewing stitch cutter. I’m tackling wiring on my first swap in the next few upcoming weeks hopefully it goes smoothly. It’s not a ls but thankfully I am doubling the power over stock and gaining fuel injection

@angiesmith9196 4 года назад

Lovin the pink ls in the background at the beginning of the video

@emperor417 4 года назад

Not doing anything ls related but I found the video very informative thank u 👨🏽‍🔧👍🏽

@fstarockaburns425 3 года назад

bro you answered just about ALL my (newb) LS harness questions in less than 1 minute AND you mobo jumboed! Excellent! My 1st move to fi and last thing i wanna do it leave junkyard and be like, oh dang - i should have grabbed this/that - THANKS!! i wanna do a dirt cheap stock ecu (re programmed) 5.3 with 706 heads and a cam spring upgrade - which I WILL vlog cos i wanna do 350, 383 then LS comparison! my 350 is already FAST (it really is) but of course that wears off quick- my buddy got a 550 crate and i wanna whip him with a junkyard build haha

@hangooksaram123 4 года назад

Super clear and well explained. Thank you!

@tyrannosaurusmex5033 4 года назад

Awesome job I am going to tackle this job on my ls swap stang thanks for the info

@ronringel9132 5 лет назад

Well done Mike... thanks for sharing.

@adee4370 4 года назад

Great job man! My favorite parts were sharpnicity and the imaginary firewall. (:

@wyattvanwart4398 2 года назад

This was actually very helpful, thank you. Here I am under the dash trying to take apart the harness wondering if I actually need anything that goes past the firewall. It's my first time doing an engine swap, and I'm actually really surprised at how smoothly everything's going. Bolts aren't seized, clips aren't breaking, I haven't bashed my hands or fingers, seals aren't tearing, I keep expecting something to happen and it doesn't.

@moralwarfare 2 года назад

I appreciate your approach, great work

@jspriver Год назад

This video plus the ls1swap site will save me a grand easy. Thanks

@tjeffjenkins6226 5 лет назад

Great job Mike!

@sanfordrhudy774 5 лет назад

Wish I had your knowledge... you make this look so easy. Killer skills man!

@illduitmyself 4 года назад

takes time to learn. start yesterday

@bigsrg1 4 года назад

Awesome explanation/tutorial and resources! Thanx!

@Sloppyjalopy123 5 лет назад

Great job bro, jam packed full of quality info.

@rajcam80 5 лет назад

Keep up the great info videos, They are very helpful. I also have the HP tuner pro.

@timwickersham869 5 лет назад

Very nice job man...made that look so easy,,,,..🤘

@robsjoholm6523 2 года назад

Great job and appreciate all the details.

@small_engine_co 3 года назад

I watch this video anytime I do a harness

@sethhill19791979 4 года назад

thanks man, lots of info. nice work. keep it up.

@Marcelo69Yenko 5 лет назад

Very nice!!!! Congratulations and thanks!!!!

@brandonpeters6379 5 лет назад

Good ass info guys. Dont stop. Cheers from the south

@joebhall5439 4 года назад

Thank you for being awesome and sharing.

@jaga7484 3 года назад

Very valuable information thank you for your time.

@rustyjunk9008 3 года назад

GREAT vid! Kind of makes me second guess not grabbing harness and ecu when i pulled my motor planning to run Microsquirt. 👍

@lugisland 4 года назад

Great video. I just discovered your channel, good content 👍

@boostin3156 5 лет назад

Swapping a 5.3 out of a Tahoe into my 2004 Subaru wrx, this really helped alot!

@anthonycosco7660 4 года назад

I wanna do this to my Impreza? Did you use the stock subframe?

@lucysmith4242 4 года назад

did you finish the swap yet?

@foghornleghorn8536 5 лет назад

Thanks for the effort you put in to create the video.

@teamreid1 5 лет назад

Great video, I too use that same site for the harness that I do. Great source for doing a harness like this. So you boys enjoy Alberta Premium Whiskey with Mountain Dew eh? That's great guys

@juancarlosmercado4209 Год назад

The video section starting at 20:54 was the best, but camera work too shaky and quick. I replayed it and got the information I was looking for. Like color of wires and quantity of wires. I am new to this. Bought an unfinished LS swap with the engine running, but I want to double check the wire work and make sure all the gauges work. The old gauges are non-op and I am installing a new digital-electronic set up. Feeling overwhelmed but very motivated! Good work on the video and thank you!

@Hysjulien69 8 месяцев назад

Subbed! Awesome video. I was scared of doing this, now I'm confident I can tackle er! I'll use the saved money on go fast parts

@kingjoe750 4 года назад

Just took my harness off, bountvto break it down. First time try this, will keep you updated.

@chevyman217 4 года назад

Same lol

@kingjoe750 4 года назад

@@chevyman217 this harness is crazy. I done with the easy part. Now I'm on to the hard part smh

@krisyaz1545 5 лет назад

Great video.. Very helpful.

@paulmarks8401 Год назад

!!! Wow thks again for sharin this will help me put this Harness in 1947 Dodge 3 ton water truck with 6.Litre and 4x4 as well Awesome IMFO Can,t waitto get it goin keep ya Posted Keep it up Ya Got this Thks

@torrypope3218 3 года назад

Gonna dive in for my LS swap into my 90 Chevy short van.I did a harness for a Subbie EJ swap into a 87 GL so I know a bit about it.

@SchneiderClassics 2 года назад

thank you glad to know. about to start an ls swap for my 67

@arianherrett1438 Год назад

Awesome video thank you!

@PLAYER200010 3 года назад

Awesome video thanks buddy

@robertironside3166 4 года назад

It all sounded fantastic right up to the point where you have the haul out the multi meter and trace all the power wires that all look the same... it was then I realized I was trapped in a nightmare :-)

@arkansastrey9694 3 года назад

The struggle is real

@frankguerra3314 2 года назад

Ty I needed to know everything like that.im putting a 5.3 in my 03 dodge Dakota..

@jackchrisman2414 4 года назад

Great video thanks

@benoitsarrasin6889 3 года назад

Thanks for the info!

@shadetreerodder 4 года назад

Good stuff!

@1979gmcummmins 3 года назад

This video is pure gold. Question is what do you do with your computer when you've made a stand alone harness?

@araporrada21 4 года назад

Thank you man !

@adamdubeau8038 3 года назад

Hey Mike, did you ever do a follow up video where you wired up the ends that you cut off from the harness, like the tach signal and wiring the fuse block?

@jimbob9218 3 года назад

Good video

@billmitchelljr6303 5 лет назад

Mike you must be a very patient guy. 🤣🤣🤣

@MrBeezweeky 5 лет назад

Nice!

@arguingwithstupidpeople2047 3 года назад

This makes me so thankful for the simplicity, reliability, and roadside tuneability of my carbureted engine.

@torrypope3218 3 года назад

Fear of what you dont understand,i used to be the same but FI is very reliable and you can trouble shoot it with a simple code reader.

@arguingwithstupidpeople2047 3 года назад

@@torrypope3218 What I have discovered is that Millennial types fear and lack understanding of carburetors. What - you think I don't have EFI on my daily driver? But my carbureted car drives every bit as well and has proven MORE reliable with much simpler wiring and fewer sensors to malfunction.

@torrypope3218 3 года назад

@@arguingwithstupidpeople2047 Im 50 so i know my way around a carb,rebuilt,I dont know ,over a 100.Just saying thaere is an advantages over carb,such as tunability,better fuel mileage and less emissions.

@antwantucker885 4 года назад

I have a aftermarket wire harness with two ground wires which one has about 5v when I plugged up everything to the battery. Should it have two grounds and should both be grounded to the engine?

@1gglywggly580 4 года назад

are stock wiring harness good for any kinda weird mods i wana do to my engine?

@hellik91 4 года назад

Thanks for the Vid! Can you de-pin all these and switch from a dbw pcm to a dbc one and it will work? Thanks :)

@Kacz101stABNDIV 5 лет назад

I honestly find it easier to de pin entire harness and separate everything. Then plug each sensor in one at a time and adjust length. To wherever your ecu will be mounted. This way you can hide or tuck the harness super easily and it looks great when you are done, also prevents rats nest

@ericjswindle 4 года назад

Zipties for the win do you buy new pins for the ecu end and if so where do you get them?

@jorgemaldonado327 3 года назад

Good videos just subscribed to your videos have. Question can a 05 silverado harness work with a cable tb i found a harness in good condition for almost free thank you for any info

@LINDRLST 5 месяцев назад

Great video, lots of information. Had a question though. What did you do to change from using a MAF to speed density and why? Was this done via the PCM programing and is a stock pcm capable of being reflashed for this? Once again great video.

@blairgautschi1453 2 года назад

I followed your video on rewiring my oem ls harness to integrate with the new holley terminator ecm that controls my high performance engine. My question is, will I have fault codes and reduced engine mode, and if so, what is the fix? Thanks man!

@mainline929 3 года назад

I have an 05 LQ9 using Lt1 Swap info and have several wires that color does not match ? on Blue C1 connector pin #7/ circuit # 2705 it shows grey GRY color and my wire is Yellow ? still on Blue C1 pin #45 it shows GRY and my wire is Tan ? All other info so far applies but I am confused on what to do with those two wires. Thank you in advance for any help and you vid is the BEST !

@chriscase6341 3 года назад

Thanks alot

@jackperry9369 2 года назад

Thanks sir appreciate it was good to c this ill have to pound this into my marble lol 😆

@dirtypulloutsgamechannel4911 3 года назад

Can I cut all the wires out going to the DBW plug I’m also doing DBC swap and need to know before cutting? Thanks in Advance!!

@fuddwacker4803 2 года назад

When I am ready for it (haven’t obtained LS yet) what should you charge me to wire one up?

@marianheaney9803 4 года назад

Best to use a dental pick to release the tab on connector pins. They can be fragile and you don't want to break any.

@punishingwithdabowtie9106 4 года назад

Hey whats up mike. I was wondering if you knew how to make a gen4 6.2l wire harness and how much?

@bigbobdasloth 2 года назад

I know it's been a while since this video was uploaded but this guide does work with the red and blue harness as well?

@josephingles817 3 года назад

Would this idea work on doing a 97 chevy camaro with a 3800 w/5speed manual and converting it over to old school with a 305 carburetor set up

@mikeverything4098 2 года назад

Do you know what color wire is connected to both the injectors and coil packs My swap cranks but no start seen on a forum some guy spliced into that wire with a 12v relay

@albertocorpus5885 3 года назад

How’s it going I have a question, what would I be doing with pins 26 & 29 HO2S B1S1 low signal- off the blue connector.

@chadreynolds1304 4 года назад

Will this harness setup work with a 72 chevelle?

@KurtisDenny Месяц назад

I need to know if I can remove oil and coolant level without issue on a regular old Silverado not stand alone. Also which cruise control wires can I get rid of

@mecanikamatir8262 4 года назад

Hi guys, what if I don't pull out the old cable. Can I still start the engine?

@simple_man_jkb 3 года назад

I learned a lot and feel more confident. But am still scared. Now how do you make what you just made plug into my 91 s10

@chancecolwell3736 3 года назад

Do you need the fuse box for the ls to run

@MattLsBr 3 года назад

Can u use the green blue pcm 5.3 wire harness with dive by cable throttle body ?

@BayWop 4 года назад

Where are you getting the pink wires for the front o2 sensors to the new fuse block? The rear o2 only has pink wires ans they are required to be removed!

@jasonhastings5538 8 месяцев назад

Mike How did you hook up obd port?

@mdamron115 4 года назад

How does hooking up a different trans work, how does the ecu know when to shift etc

@bradywilliams2666 4 года назад

He said he's using a powerglide trans. Which is non comp. controlled.

@mikeyhue2437 3 года назад

26 of Albert prime on the table lol 🤙

@juliobriseno7721 Год назад

Question on the drive by wire if removing can i still use throttle body cable driven with the 2003 2005 ecm . Thank you so much!!

@SPPTVarmy Год назад

I believe it depends on the individual ecm if they have the option. Closer to 2003 the better as it's more likely to be capable of both. If you found an ECM at a Junkyard you may be able to google the part number and find out forsure.

@ericthompson3477 4 года назад

Do you have to power each injector ?

@rand4561 3 года назад

Hey man what about the fuel pump harness?

@Zone6G 5 лет назад

Another great video. Do you need coolant temp to run speed density? Does the wideband have to be fed into the ecu? I sent my harness out, and don't have coolant temp in the harness anymore, and my wideband isn't wired into the harness.

@SPPTVarmy 5 лет назад

Coolant temp is needed yes, for multiple functions of the ecm. Your wideband would be completely seperate.

@Zone6G 5 лет назад

@@SPPTVarmy Thanks. The plug that was the coolant temp plug is labeled IAT, and I don't have a coolant temp. Now I have to tear into the harness I already paid for smh. Guess I'm back to checking pinouts.

@Zone6G 5 лет назад

@@SPPTVarmy That video was so spot on. I'm donating next live stream. I checked my harness again. I did have coolant temp and IAT, just both with the same style plug. They both had continuity with their assigned pins.

@songokux4 4 года назад

That first time seeing it gave me an anxiety attack but you explained well

@johnpaulgarrido1496 5 лет назад

Thank u for ur video but it really complicated there a lot of people that are not running ur setup I'm really confused because there a lot of wire u cut off that I have no idea what they look like

@kevinwest3689 4 года назад

Dang I wish I was building a sonic Stang, I still don't know what I can cut or shouldn't for my application. The hardest part about the swap is finding a video of someone that knows what they're doing that's doing the same thing you are. 🥴

@MuscleCarMike 5 лет назад

I have a 79 Trans am im thinking of ls swapping

@rossrockey4803 4 года назад

So, I still have this giant wiring harness laying over the top of my motor. Does each injector really need its own pink wire running all the way from the fuseblock? Any reason we can't splice them all together at the back of the manifold and run one slightly larger wire over to the fuse block?

@theredfishkid 4 года назад

Ross Rockey ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-9a_3wQHcm_Y.html

@dlawson8993 4 года назад

If you're using a th400 and plan on using a 4l80 later do you leave the transmission wires in the harness? Also will the computer work the way it should if you do?

@mikejackson4538 Год назад

You can leave the trans wires but you have to delete it from pcm, if you ever go back to electric trans then have to have that added back to pcm

@franciscolara8359 8 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?

@andrewcaldwell4836 2 года назад

How much do you charge to make a 5.3 wiring harness for 1991 chevy caprice classic I have a 5.3 wires harness and pcm and fuse box ??

@ericanders7551 2 года назад

My question is that I have a 6.0 and a 4l80. Can I go ahead and grab an ECU from a junkyard out of a truck or van with a 6.0 and 4l80?

@mschaffer2826 Год назад

Do you have a link to LT1 swap for the pinout guide?

@MrBeezweeky 5 лет назад

I am about to pull a 5.3 out of a '02 silverado for a swap. Should I leave the harness attached to the motor where I can or is it easier to just pull it separately?

@SPPTVarmy 5 лет назад

I would pull it all off and get it out of the way. Reduces the chance of damaging the harness too.

@rubenfilippus2956 4 года назад

What is that app called the one shows the colours of wire's?

@JamesSmith-yd1fd 4 года назад

How about where your scan tool plugs up

@texasstarauto4542 2 года назад

On the o2 sensors the rears on the hp tuner is it just turning them off or is there more to deleting them

@SPPTVarmy 2 года назад

It's basically just setting the ECM to ignore the code by changing the "Check Engine Light". You can tell the ECM to not watch for that error or report it.