DON'T BE SCARED! Here's How To Wire Up Your LS ENGINE!

there's about four feet of snow that's dedication in this video i'm gonna be showing you the easiest and fastest way to make your own standalone engine harness for your project i have a 2004 silverado 2500 ignore the door it was replaced at one point but it has a 6 liter lq4 it doesn't matter if you have a 4.8 5.3 or 6 liter harness you can mix match them to whatever engine you have as long as they have the same style pcm connector the pcm connectors are either red and blue or green and blue also keep in mind that if you do mix match your harness and your engine your pcm will need to be tuned if the displacement is different the stock harness is fully intact i'm going to carefully remove it and then i can start simplifying it [Music] all right so i got the harness removed just have to pull it out the first step is to have a nice open workspace this will make your life a lot easier and it won't be as confusing then carefully lay out the harness so that all the wires aren't tangled together once it's all laid out start taking off all the wire loom and tape [Music] after you take the tape and wire loom off this is what you're left with it may look daunting to some of you but don't worry it's not actually that complicated once you dive in sometimes these fuse blocks are stubborn it's hard to take them out all you have to do is you push on one side and then you push on the other side start wiggling and they should pop out you want to take these plastic covers off of the connectors all you have to do is you pinch these two clips on either side and it pops out same thing on the other side go ahead and clean up your connectors there's little numbers for every wire you're going to use those numbers to identify which wire you have to remove [Music] with clean connectors now you should be able to read the numbers those numbers are what you need in order to know which wire to remove you also want to pop off the blue caps you just have to push a little tab with a flathead screwdriver on the end and on the other end as well and it pops off now you're ready to remove all the unnecessary wires to know which wire to remove you're gonna go on lt1swap.com you're gonna find these sheets i'll leave a link in the description and these are sheets to tell you exactly which wire you need to remove which ones you need to keep there's a blue sheet and a green sheet both for your blue pcm connectors and for your green pcm connectors and if you have an older style pcm with the blue and red connectors there is a red sheet as well to use the sheet it's very simple the pins that are highlighted yellow need to be removed they're not important and then all the pins that are highlighted blue they are important and you need to keep those in order for your harness to work then there's tan highlighted pins those are optional you can see whether you need those in your project or not so this is the blue connector the first wire you want to remove on the 2003 to 2007 truck is the pin connector number seven that is a gray wire it's highlighted yellow on your sheet so this is the wire i want to remove all i do is you grab the base of the wire you go on the other end and you just push on the wire and you see the pin come up you pull it through and then you leave it there now go through the list of all the wires you need to remove and do the exact same thing as this one so i've pulled through all the wires i need to take out of the harness all you have to do now is you individually cut off all of these pins and then you can pull the wire back through the other end and then just remove it from the harness do that for the rest of the wires [Music] all the wires are gone on this blue connector now it's time to do the exact same thing with the green connectors while you were removing wires from your harness you may have noticed that some of these connectors have only one wire that was removed and the other one's still intact somewhere in the harness the reason for this is because they are grounds they're always black if you follow them back they go to splice packs and you simply just want to cut them close to the splice pack and then you'll put some heat shrink or something to cover those up [Music] next up you want to move over to this c2 fuse block there's a lot of wires you're going to need to remove you can actually reuse this with the original fuse block but i don't find that makes a nice job so for this application we're going to be making a new fuse block again on the side here there's little numbers those are the numbers you're going to need to follow and then on the top there's letters a b c d e and f most of these pink wires are going to be used so just follow along to your sheet make sure you label the wires you need and then remove the rest everything's cut off the c2 block and i labeled everything after you're done with this block you move over to the c100 you just simply cut it off and then you label every wire that goes over to the pcm and then any wire that goes off to a connector you just want to remove it now everything's labeled if you had a drive by wire harness you're left with this um you can either keep it if you're gonna have drive by wire or if you want drive by cable just remove it and remove the pins from the pcm connectors once you're done removing and labeling every wire go around your harness and any connector that only has the ground attached trace it back to the splice pack and then cut it off so after you've removed all the grounds from the connectors downstream in the harness you should have two left that you'll need to ground on the back of the block if these aren't making a good connection you're gonna have some problems come back to your main connectors here for your pcm go through your list separate every wire that's highlighted blue and then start labeling them after following your sheet on the blue connectors you should be left with obd2 serial data cruise your fused battery feed there's also one more that i have labeled here and it's your off run crank position and on the green connectors you should be left with rpms your fuel pump relay vehicle speed and your engine light there that's all the wires removed every connector is going to be used from now on the tricky thing now is that every application is different so to know where to route your wires you're going to kind of have to uh plan ahead for your project and figure out where you want to place your pcm so that you have enough wire to reach now you just want to go ahead and clean up every wire put tape and then you can start putting some loom back on but again since everything is kind of unique to your own project i'll just go ahead and show you what i'm doing but you don't have to necessarily copy that [Music] [Music] there you have it that's how you make a standalone engine harness for your project hopefully you learned something from this video and you're a little less intimidated by these harnesses because it's very doable and once you get started it's not that complicated

Channel: agtrucks

Views: 10,597

Keywords: Lsswap, Ls, lq4, 6.0, harness, harness rework, how to make a wiring harness, how to make a ls standalone harness, how to make a ls engine run, how to make a ls motor run, cheap and easy, fast, best standalone harness

Id: DKJ2EKTzPjA

Length: 10min 41sec (641 seconds)

Published: Mon Feb 07 2022