6G Celicas Forums

does any have a diagram of the splicing needed for the 3sgte to 5sfe wiring harness conversion.... i need this really bad plz help... any info possible would be great

if this kind of info was easy and readlily available, Tweak and DG wouldn't be charging $300+ to have the 2 harnesses wired. Your best be if you're serious about doing it yourself is to get the Toyota electrical wiring books for your car (1995) and the one from the 3sgte motor. Then compare diagrams and get to it. Just remember, one wrong wire and the car might not start or you could blow other electrical componets.

Wow thank you for the insightful information batman...

Im currently in this same process just doing wiring now. Can anyone that has done this conversion send me an email with a heads up, as im using my old sw20 mr2 ECU and motor. everything is done - minus wiring. i cant find the pinout diargrams for the A/T 5sfe can someone please help me locate one

Hey new guy... you might want to show some respect... especially to a senior member like batman. Then they might help you if you wouldn't ask questions that you can research yourself. The best place for wiring information would be... oh yes the toyota manuals like he already said... try the BGB... and i know if you research enough we have them posted somewhere around here....

was that even needed? a simple i dont know would have worked.... maybe he wants to try it himself.....worse case he messes up and learns

Right now I'm in the process of doing one of these harness conversions from scratch.
Here are my tips for anyone that wants to do this:

1. DONT DO THIS IF YOU NEVER DID ANY CAR WIRING BEFORE. If you dont know how to solder, or use heat shrink tubing or read wiring diagrams and dont have a clear understanding of how automotive electrical systems work DO NOT DO THIS.

2. Follow batmans advice and buy the toyota wiring books. Why? Well we do have a few engine wiring diagrams floating around on the net in PDF format. They will give you about 80% of the info you need, however there are certain specific functions that are not part of that engine wiring diagram that need to be looked up in the rest of the book.

3. Make sure you have plenty of free time. While it might take someone whos done this before a week or so to finish, the very first time takes the longest because of the amount of research and note taking that you have to do to figure out what wire goes where.


One of my original goals during this harness project was to document everything and to post a giant how to. However after putting in all of this time and effort, I can see why the people who currently do this service, do not just give this kind of information away for free. It takes an very long time to research each part of the two cars electrical system and figure out how to mate them together. Not to mention that I would also hate to see people who have never done any major wiring before try to follow any kind of tutorial and burn their car to the ground.

Having said all that, if your into wiring, buy the books, make your notes and go for it. Its actually a really fun project.
However if you are just trying to finish your swap and get your car running, go mail out your harness to someone like DrTweak. The 400bucks he charges is a bargain for the amount of time and effort it would take you to do this on your own for the very first time.

This post has been edited by lagos: Feb 17, 2009 - 12:03 AM

tweak just put this car together lastyear?
what happened is he gettin sloppy?
or did you get boost crazed?
it was a gen 2 right?


nothing against tweak, have you asked him to fix the car?

i have access to a program called alldata at my school for auto mechanics if someone needs some diagrams or info i would be happy to try and look it up.

did you even look to realize this thread is from 2007?

reading comprehension owns this site lately.

ooops my bad