Home / Toyota Supra Forums

Go Back   Toyota Supra Forums! Join the Supra forum! > Performance, Modification, and Maintenance Forums - for generation specific discussions > MKIII Supra

Reply
 
Thread Tools Display Modes
Old 06-02-2010, 11:11 PM   #1
joshtexican
3" Exhaust
 
Join Date: Apr 2010
Location: NC
Posts: 136
joshtexican is on a distinguished road
Default Replace Wiring Harness???

Hey guys,

I threw a rod in my 86.5 na. I have a built 7mgte motor on an engine stand that I was going to eventually put in another supra (turbo body). So I am forced to put the 7mgte into my 86.5 mk3. I have the complete uncut harness, ecu, and motor (still putting together) for a 90 model 7mgte.

Question: would it be easier to pull the complete wiring harness out of NA and replace it with the complete wiring harness for the 90 7mgte?? If that were the case, do I need to use the dash as well or is it basically just swapping the harness, ecu, and motor?? - VS - Splicing the NA harness and doing the necessary wire work to make it work the 90 7mgte??

I am in desperate mode to get this car running already and now I am basically forced to put this motor together and drop in the car. I was putting this motor together little by little but now I am making it my priority to drop in my car.

I will start taking the car apart this weekend and any help will be appreciated!! I am waiting on the gasket kit to get here and a few other things I ordered. Hope to hear from some of you more experienced mk3 owners.

Thanks in advance
joshtexican is offline   Reply With Quote
Old 06-02-2010, 11:27 PM   #2
wstanek
3" Exhaust
 
wstanek's Avatar
 
Join Date: Apr 2010
Location: Stoney Creek
Posts: 178
wstanek is on a distinguished road
Default

just replace the whole harness would prolly be easier
wstanek is offline   Reply With Quote
Old 06-03-2010, 12:09 AM   #3
joshtexican
3" Exhaust
 
Join Date: Apr 2010
Location: NC
Posts: 136
joshtexican is on a distinguished road
Default

That seems to be the best way. Just wondering if anyone has ever done this on a 86.5 before.
joshtexican is offline   Reply With Quote
Old 06-03-2010, 12:29 AM   #4
wstanek
3" Exhaust
 
wstanek's Avatar
 
Join Date: Apr 2010
Location: Stoney Creek
Posts: 178
wstanek is on a distinguished road
Default

Not me but i assume many people have on this forum look around theres gotta be a post cuz there is hundreds of posts in this area alone!
wstanek is offline   Reply With Quote
Old 06-03-2010, 01:52 AM   #5
btwilson86
Super Moderator
 
btwilson86's Avatar
 
Join Date: May 2007
Location: Billings, Montana
Posts: 1,034
btwilson86 is on a distinguished road
Default

I believe that in addition to replacing the engine harness, you will want to replace your dash wiring harness and gauge cluster from a Turbo vehicle as well. There are some compatibility issues with some of the gauges (I believe the Tach is one of them)
__________________
1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
btwilson86 is offline   Reply With Quote
Old 06-03-2010, 02:15 AM   #6
joshtexican
3" Exhaust
 
Join Date: Apr 2010
Location: NC
Posts: 136
joshtexican is on a distinguished road
Default

Ok cool, I do have 2 dash wiring harnesses and 2 gauge clusters. So just swap everything correct?
joshtexican is offline   Reply With Quote
Old 06-03-2010, 03:15 AM   #7
cre

Toyota
Racing
Development
 
cre's Avatar
 
Join Date: Apr 2007
Posts: 5,038
cre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond repute
Default

The dash harness may remain as long as it's the same sub-generation (pre 89 to pre89 OR 89+ to 89+). The tach has a couple different resistors depending on which ECU is used and for most it's easiest to replace the whole unit or the control board inside it.

As for modifying a GE harness to work with GTE electronics... FORGET IT... crazy idea and you'll spend years wondering why the car never started up again... it'd be easier to just build one from scratch.

The GTE's chassis harness has the connectors for the boost gauge sensor, IIRC and I'm not sure if the GE's body harness has the connector for the A/C push fan, but for the most part you're fine if you're going from manual to manual and same gen.
__________________
If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum.

If you're so inclined I'm always more than happy to accept tips via PayPal.
Tip Jar --->
cre is offline   Reply With Quote
Old 06-03-2010, 01:28 PM   #8
wstanek
3" Exhaust
 
wstanek's Avatar
 
Join Date: Apr 2010
Location: Stoney Creek
Posts: 178
wstanek is on a distinguished road
Default

thats what i thought it would take forever to modify.
wstanek is offline   Reply With Quote
Old 06-03-2010, 02:47 PM   #9
joshtexican
3" Exhaust
 
Join Date: Apr 2010
Location: NC
Posts: 136
joshtexican is on a distinguished road
Default

Thanks a lot guys, I will basically be swapping the "complete" wiring harness when I pull the motor out then dropping the "rebuilt" motor in.

Kinda off subject but, how do I upload pics from a mac? does anyone know, I want to start a new thread and post pics of this project I am doing so you guys can see the progress.

Thanks
joshtexican is offline   Reply With Quote
Old 06-03-2010, 04:09 PM   #10
btwilson86
Super Moderator
 
btwilson86's Avatar
 
Join Date: May 2007
Location: Billings, Montana
Posts: 1,034
btwilson86 is on a distinguished road
Default

There's a good post on this somewhere here....


Here it is: Posting Pics
__________________
1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
btwilson86 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
89 toyota supra wiring harness! lolSupra Non-Generation Specific Questions 0 09-05-2008 03:49 PM
87 na wiring harness.. 7Mpowered87 MKIII Supra 3 05-13-2008 05:01 AM


All times are GMT. The time now is 05:35 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2022, vBulletin Solutions, Inc.

1986



1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87