questions for those that used Lextechs 411 wiring guide

[BOTTLEDZ28]

I trying to get a better understanding of exactly what needs to happen on the wiring side of my upcoming LS swap in my 98 Tahoe 4x4 and I have a question for those of you that have repinned your OEM harness for use with the 411 PCM.

did you reuse the wiring from the OEM injector connector and just add individual coil pack connectors to it or did you remove all those wire from the harness and start new ones from the 411 PCM?

[Chevydillan]

Just to avoid cutting and splicing, I removed the coil wiring and the injector witing from the donor truck harness and loomed them into my trucks factory harness. They were plenty long and now I dont have spliced wires. Just how I did it but would work just fine either way.

[BOTTLEDZ28]

so where did all the wires go from your OEM harness that once went to that big injector plug on the Vortec engine? Can they all be removed from the harness or do I need some or all of them for other things now?

Also, does anyone have any feedback on what happens with the EVO sensor on the PS pump? My truck has this steering assist sensor and Im not sure where this would now tie in to the 411 PCM

[Chevydillan]

I just removed them completely. But if your not adding any new wires from the PCM you just need to splice into the original injector wiring which will work out just the same. You'll just be using those wires for the injectors nothing else.
The power steering plug can just be left unplugged if your going with the LS donor ps pump. Nothing will happen at all. I did just that and glad I don't have that variable power steering anymore

[capricefrk013]

I cut off the big injector plug and had my injector wiring already inline on the motor and soldered the old to the new. I got lost with Lextechs diagram and ended up running a lot of the LS plugs and wires directly to the PCM. I got overwhelmed and I will definitely do it differently next time.

[greenvortec]

link to said diagram?

[Chevydillan]

You'll have to pm lextech for his witing file

[BOTTLEDZ28]

I cut off the big injector plug and had my injector wiring already inline on the motor and soldered the old to the new. I got lost with Lextechs diagram and ended up running a lot of the LS plugs and wires directly to the PCM. I got overwhelmed and I will definitely do it differently next time.

what would you do differently? Would you use Lextechs diagram or use the GEN 3 harness and PCM along with the stock PCM?

[capricefrk013]

what would you do differently? Would you use Lextechs diagram or use the GEN 3 harness and PCM along with the stock PCM?

I would start from scratch and made my own harness. If I had the time, which I didnt because my truck is my DD, I wouldve gutted the entire harness from the engine bay and grafted everything together as if it was supposed to be. In a way, Lextechs diagram would make that happen but its the details that I care about and I am not happy with the way mine turned out but again it is my DD and I couldnt be out of it any longer. I deal with 12 volt wiring every day and I make damn sure I am perfect with my wiring everytime.

[BOTTLEDZ28]

I would start from scratch and made my own harness. If I had the time, which I didnt because my truck is my DD, I wouldve gutted the entire harness from the engine bay and grafted everything together as if it was supposed to be. In a way, Lextechs diagram would make that happen but its the details that I care about and I am not happy with the way mine turned out but again it is my DD and I couldnt be out of it any longer. I deal with 12 volt wiring every day and I make damn sure I am perfect with my wiring everytime.

Good to know My truck is my DD too and I know exactly how you feel about the wiring needing to look perfect. I did exactly that with my camaro build. I ripped out the entire engine harness and tossed in in favor a stand alone hanress from FAST. I then grafted the needed circuits to it and away it went. It took a while but the end result was a very neat and uncluttered engine compartment AND the wiring was done correctly. It sucks when we try to mod our DDs because time ends up dictating the quality of our work sometimes.

Im still torn right now on what to do with the harness side of things. My brain is about to explode from reading this forum, gmt400 and lt1swap!! Just when I think I have a good grasp on what needs to happen and what parts I need, I find someones elses build thread and BAM, they did something different.