questions for those that used Lextechs 411 wiring guide

[capricefrk013]

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.

Thats exactly how I felt when researching mine. I just made sure I had all the parts I needed to mail order were on hand before starting and the rest of them I had delivered from the parts store while working on it.

You could use the wiring on the LS motor and just remove the unneeded wiring from the OBS engine harness and leave the trans harness alone and just pin them in to the 411. Splice the cruise wires in to the TAC module that will mount in the same location as the cruise. Repin the data wire from OBS PCM to LS PCM so the OBDII port still works.

When I did mine, I used Lextech, LT1swap and Alldata diagrams to make sure all was correct. The only think that was messed up with mine were the o2 sensor wiring. I am gonna go speed density on mine so I wont need them anymore.

[Steve l.]

Capricefrk, what issues did you have with your o2 wiring?

[BOTTLEDZ28]

So Im undecided on which direction I want to go in with the wiring side of things.

Use OEM harness and modify it per Lextechs diagrams

Use the harness from the donor engine and modify it to run with the 411 PCM and keep the stock PCM on board to run gauges

decisions decisions

[Chevydillan]

Well no matter what way you decide to go there is no reason what so ever to
Keep the original ecm. Just get the wiring file from Lextech and modify your harness. You can still take the time needed to make it look good and it will fit your engine bay the way it's suppose to. The 411 will run all gauges and all. No need to keep the old black box.

[BOTTLEDZ28]

I MAY just modify a GEN3 harness to as long as I can get some detailed info on how to get the trans wired in to work with 4wd. I dont want the truck to be down for a prolonged period of time. If I can get a jump start on the wiring side of things while the engine is on the stand then I can continue to drive my truck until the last possible minute prior to the swap.

[BOTTLEDZ28]

I managed to get a chopped up LS harness from a 2001 2wd truck along with the 0411 ECM. I havent dug into it yet to see what was cut out of it. What I want to know is if the my trucks OEM harness connectors for the engine are the same as the LS connectors. If all the connectors plug into the same sensors then I might just use the OEM harness and add in the injector wiring from the LS harness.

[capricefrk013]

Not all of the plugs are the same. most are for the most part.