03 sierra 4.3 to 5.3 swap(i need help)

[sonnychills]

need some help!!!!!!!

only one plug im having trouble with, this one...
its a blue/white plug that doesnt fit... motor and harness are from 99-02 and my truck is 03, i wanted to keep cable trottle body. but these plugs do not fit nor have the same wire in the correct spot... also the truck side of the harness has 8 wires and the motor harness has 7, the only wire different is on the truck side which is a brown/black.









this is in big_countrys 04 silvy z71 notice both plugs are white....



DO I HAVE THE WRONG HARNESS?

[00_Silverado_Z71]

I'm going to tell you this now i'm in the process of doing a v6 - v8 swap in my 04 and its damn near impossible to try and make a 99-02 harness fit an 03+ truck and its more trouble than its worth to try and keep the cable driven throttle body. I tried and tried everything I could possibly think of to make this work and it just isn't worth it. Get yourself a harness from an 03+ truck and the drive by wire stuff and save yourself the headache trust me. The pin outs for the 99-02 harness are different from the 03+ so they do not work when you plug in the 99-02 pcm my truck did all kinds of weird stuff because nothing is pinned right in the wiring harness compared to the 03+ in the truck already.

[sonnychills]

I get that but this plug is the only issue I've had. The colors combo between both are the same just in different pin locations, maybe I can just hardener them together and see what happens

[Botlfed]

You can try repinning it, me and a buddy did an 04 standard, converted from a wt edition to ls, we ended having to switch all kinds of stuff, finally after much debate, time, and money we switched to a dbw tb, btw the 04 is the worst year to do.

[sonnychills]

I'm gonna try to call Nelson performance today but I'm thinking I am just gonna re pin it. Everything else plugged in fine except this one.

[00_Silverado_Z71]

You can try repinning it, me and a buddy did an 04 standard, converted from a wt edition to ls, we ended having to switch all kinds of stuff, finally after much debate, time, and money we switched to a dbw tb, btw the 04 is the worst year to do.

I can agree this is what I am doing is a 2004 Standard WT to an LS and after going through every possible option I finally just broke down and bout the DBW stuff. I had went over everything with Allen at Nelson also and all decided the best and easiest option was to do the dbw because he didnt even have a vin to program a 03+ for dbc. Which pcm are you trying to run the 03 or the 99-02 style?

[sonnychills]

99-02 style with cable ecu has already been tuned.

[lowslung85]

I'm going to tell you this now i'm in the process of doing a v6 - v8 swap in my 04 and its damn near impossible to try and make a 99-02 harness fit an 03+ truck and its more trouble than its worth to try and keep the cable driven throttle body. I tried and tried everything I could possibly think of to make this work and it just isn't worth it. Get yourself a harness from an 03+ truck and the drive by wire stuff and save yourself the headache trust me. The pin outs for the 99-02 harness are different from the 03+ so they do not work when you plug in the 99-02 pcm my truck did all kinds of weird stuff because nothing is pinned right in the wiring harness compared to the 03+ in the truck already.

Just do as he says lol, we have already went through this on his truck, harness,dbw tb,tac module, and pedal ur best bet is to pull it from a salvage yard and dont forget the harness from the pedal to the tac module. Btw putting the pedal in sucks.

[sonnychills]

Hahaha yeah I pulled the harness today, took some pics will post later and I can see why it won't work. Oh well now I know, hope to look for the dbw stuff tomorrow

[sonnychills]

ok in this pic is the motor side of my 99-02 harness the screws into the fuse box

this is a pic of my actual fuse box...

notice the difference? looks like about half of what should be there is...
so i pulled the harnes today and im shipping it back to the guy i got it from. he said he has a 03+ harness that he will trade me (since i paid 150 for this one) and hopefully the guy he had tune me ecu for cable will just swap this ecu for another.... if not im going with nelson or a guy my buddy knows around here. priced out the pedal, harness, tac module, and dbw throttle today ( about 200 bucks). i really hope to have it running by november cause im going to a show to benifit breast canser. my mom is going with me and she has stage 4, so i really need to get this going so she can roll up in something thats gonna be in the show. if i missed anything please chime in....