Wiring bundle question

yale · 03-05-2018, 12:39 PM

After swapping out my 7MGE with another one I have two electric connectors that remain unidentified. The engine swap was short block so all the harnesses and components were reused. It is an automatic.
The first is a bundle of five (5) brown and brown/white that are all part of single loop. Very much like a ground connection. These come down through the intake plenum and reach down towards the starter area. I believe they are ground and connect with a bolt on the plenum.
The second is an electrical connector, square and grey/clear, that appears to go with the three large transmission connectors, again down by the starter.

The starter will not engage but I believe that we have one of two issues there. 1) neutral safety switch or 2) security system (but I don't have the Theft Deterrent Computer in the car anymore).

Any help on identifying those electrical connections would be appreciated.

Bru · 03-06-2018, 05:03 AM

Yes there is a bundle of ground connectors that bolt on to the intake manifold where the 2 manifold pieces meet. On my 87 Turbo with a manual transmission there are 2 copper pieces that the wires go into like a clip that bolts onto the intake manifold. One time I forgot to tighten that bolt and it acted very squirrely, dying randomly, etc. About the automatic Wiring, I cannot say, since I've never had one. You may be able to find something online at cygusx1 or in the back of a Toyota dealer shop manual for your year.

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/

yale · 03-06-2018, 12:12 PM

Thanks for the reply!
We tested those wires several times and found they were not hot so went ahead with grounding them on the plenum. All is well.

Car is running and shifting fine without that 4-wire block being connected. It was extremely dirty so probably not in use to begin with.

03-05-2018, 12:39 PM	#1
yale Intake Join Date: Oct 2015 Location: CT Posts: 38	Wiring bundle question After swapping out my 7MGE with another one I have two electric connectors that remain unidentified. The engine swap was short block so all the harnesses and components were reused. It is an automatic. The first is a bundle of five (5) brown and brown/white that are all part of single loop. Very much like a ground connection. These come down through the intake plenum and reach down towards the starter area. I believe they are ground and connect with a bolt on the plenum. The second is an electrical connector, square and grey/clear, that appears to go with the three large transmission connectors, again down by the starter. The starter will not engage but I believe that we have one of two issues there. 1) neutral safety switch or 2) security system (but I don't have the Theft Deterrent Computer in the car anymore). Any help on identifying those electrical connections would be appreciated.

03-06-2018, 05:03 AM	#2
Bru Bone Stock w Upgrades ;-) Join Date: Apr 2010 Location: Tampa Bay Posts: 210	Yes there is a bundle of ground connectors that bolt on to the intake manifold where the 2 manifold pieces meet. On my 87 Turbo with a manual transmission there are 2 copper pieces that the wires go into like a clip that bolts onto the intake manifold. One time I forgot to tighten that bolt and it acted very squirrely, dying randomly, etc. About the automatic Wiring, I cannot say, since I've never had one. You may be able to find something online at cygusx1 or in the back of a Toyota dealer shop manual for your year. http://www.cygnusx1.net/Supra/Library/TSRM/MK3/ Last edited by Bru; 03-06-2018 at 05:05 AM. Reason: typo

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
7mgte Wiring harness question	supraheelfan	MKIII Supra	16	06-11-2012 10:26 PM
I'm starting to buy parts for my 1jzgte swap... wiring question?	cfurlan	MKIII Supra	0	01-12-2011 01:09 AM
1989 non-turbo wiring harness question	Oceanside	MKIII Supra	0	10-23-2010 09:37 PM
question about wiring harness?????	tone loc	MKIII Supra	2	08-30-2006 09:20 PM
Wiring question?	redmaro	MKIII Supra	4	05-12-2006 04:34 PM

03-06-2018, 12:12 PM	#3
yale Intake Join Date: Oct 2015 Location: CT Posts: 38	Thanks for the reply! We tested those wires several times and found they were not hot so went ahead with grounding them on the plenum. All is well. Car is running and shifting fine without that 4-wire block being connected. It was extremely dirty so probably not in use to begin with.