7mgte Wiring harness question

supraheelfan · 05-28-2012, 01:12 AM

What would have to be done to switch the manual harness to auto? I know its easier to just get a replacement manual harness but I cant find one. So is it worth it to try the auto?

cre · 05-28-2012, 05:37 AM

Which are you asking for: adapting a manual harness to an auto or adapting an auto harness to manual? An auto harness should work in a manual equipped MKIII with no problem, as-is... The same is not true for the opposite configuration.

supraheelfan · 05-29-2012, 05:47 PM

Okay, so I have an auto harness I want to put in my manual supra.

btwilson86 · 05-29-2012, 07:21 PM

You will need to place a jumper between 2 connectors to bypass the neutral start switch (that isn't present). And if you want your reverse lights to work, you have to create a jumper for them as well. Other than that, the harness is plug and play

supraheelfan · 06-11-2012, 09:09 PM

Quote:

Originally Posted by btwilson86

You will need to place a jumper between 2 connectors to bypass the neutral start switch (that isn't present). And if you want your reverse lights to work, you have to create a jumper for them as well. Other than that, the harness is plug and play

To clarify on your statement btwilson86, if this is not done (jumping the 2 connectors to bypass the neutral switch), will it hinder the car from starting at all? We put an 88 auto turbo harness in my 87 manual and its not wanting to crank at all.

btwilson86 · 06-11-2012, 09:42 PM

Correct. This will cut power to the starter solenoid, so the starter motor won't crank.

I believe I may have mistyped my previous post, there should be a round connector with 3 terminals heading down towards the transmission; the jumper connects 2 of those terminals to complete the circuit. The reverse light switch connects to 2 different connectors. I'll see if I can find the connector and pins in the tewd for you

btwilson86 · 06-11-2012, 09:45 PM

To complete the starting circuit, you will need to place the jumper between terminals 2 and 3 in connector D at the top of the image

05-28-2012, 01:12 AM	#1
supraheelfan 3" Exhaust Join Date: Feb 2011 Location: Wilmington, NC Posts: 178	What would have to be done to switch the manual harness to auto? I know its easier to just get a replacement manual harness but I cant find one. So is it worth it to try the auto? __________________ Anyone who has never made a mistake has never tried anything new.

05-28-2012, 05:37 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Which are you asking for: adapting a manual harness to an auto or adapting an auto harness to manual? An auto harness should work in a manual equipped MKIII with no problem, as-is... The same is not true for the opposite configuration. __________________ 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 --->

05-29-2012, 05:47 PM	#3
supraheelfan 3" Exhaust Join Date: Feb 2011 Location: Wilmington, NC Posts: 178	Okay, so I have an auto harness I want to put in my manual supra. __________________ Anyone who has never made a mistake has never tried anything new.

05-29-2012, 07:21 PM	#4
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	You will need to place a jumper between 2 connectors to bypass the neutral start switch (that isn't present). And if you want your reverse lights to work, you have to create a jumper for them as well. Other than that, the harness is plug and play __________________ 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

06-11-2012, 09:42 PM	#6
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	Correct. This will cut power to the starter solenoid, so the starter motor won't crank. I believe I may have mistyped my previous post, there should be a round connector with 3 terminals heading down towards the transmission; the jumper connects 2 of those terminals to complete the circuit. The reverse light switch connects to 2 different connectors. I'll see if I can find the connector and pins in the tewd for you __________________ 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

06-11-2012, 09:45 PM	#7
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	To complete the starting circuit, you will need to place the jumper between terminals 2 and 3 in connector D at the top of the image __________________ 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

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