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1991 t5 nutural safety harness problem

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1991 t5 nutural safety harness problem

Old 12-22-2018, 03:30 PM
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cole scott
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Default 1991 t5 nutural safety harness problem

So the person beforehand meant did a t5 to c4 swap and Didn't have the Nss attachment on the c4 so I'm putting my t5 in right now and I see that I have nowhere to plug my trans short harness nss into.. so what do I do and where would the attachment even be?

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Old 12-22-2018, 10:47 PM
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Originally Posted by cole scott View Post
So the person beforehand meant did a t5 to c4 swap and Didn't have the Nss attachment on the c4 so I'm putting my t5 in right now and I see that I have nowhere to plug my trans short harness nss into.. so what do I do and where would the attachment even be?

Don't quite understand. Is the plug you're holding on the wiring harness? If you don't mind being able to start in neutral (there's probably a clutch pedal switch anyway, maybe), jumper the two wires which the nss in the transmission normally closes in neutral.
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Old 12-22-2018, 11:04 PM
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Originally Posted by imp View Post
Don't quite understand. Is the plug you're holding on the wiring harness? If you don't mind being able to start in neutral (there's probably a clutch pedal switch anyway, maybe), jumper the two wires which the nss in the transmission normally closes in neutral.
--the one picture was the harness coming out of the car and the second was my trans

--and jumper which wires? The trans short harness or the nss inside the car?
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Old 12-24-2018, 08:36 PM
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Originally Posted by cole scott View Post


--the one picture was the harness coming out of the car and the second was my trans

--and jumper which wires? The trans short harness or the nss inside the car?
It sounds as though the harness may have been changed when the C4 was put in. Now, according to my 1990 Shop Manual, the only electrical connection to the T-5 transmission is a back-up lamp switch. The neutral start function is handled by a switch mounted on the clutch pedal. You need to determine if that switch is still operational, trace it's wiring, and connect the switched wire (not the one from the ignition switch) to the starter solenoid under the hood.
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Old 12-24-2018, 09:03 PM
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Originally Posted by imp View Post
It sounds as though the harness may have been changed when the C4 was put in. Now, according to my 1990 Shop Manual, the only electrical connection to the T-5 transmission is a back-up lamp switch. The neutral start function is handled by a switch mounted on the clutch pedal. You need to determine if that switch is still operational, trace it's wiring, and connect the switched wire (not the one from the ignition switch) to the starter solenoid under the hood.
my t5 is a 93 and no wiring was changed when the c4 was put in but there is a nss connect to the pedal and has been bypassed , but the nss short harness on the trans is what I'm talking about.
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Old 01-10-2019, 05:29 PM
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I just took a picture of the 2 harnesses that pass from the cabin,through the rubber grommet,to the trans tunnel and
they appear shaped differently than the ones shown in your picture.I was lying on the driver side looking up at the two harnesses.My car is a 91 t5 car.Ive had the engine out of this car for awhile so the harnesses arent plugged into anything for me to reference.One has a 2 pin connector & the other one has a 4 pin connector coming out at that location.I know its kinda hard to see in the disorienting picture,but if you look directly above my middle finger,you can see the same rubber grommet thats shown in your picture.One harness plug is round & the other is round with one squared off portion.Do either one of my harness plugs look like they will plug into your ngs (neutral gear switch ) Is your car an original t5 car or could it have possibly been equipped with an aod instead & be the reason why one of your plugs appears different?? If you're not sure,check the trans code on the white certification label.Its located on the end of the driver side door.
​​​​​​


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Old 01-10-2019, 05:45 PM
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Both of my harness plugs,going by their shape,appear to match the harness plugs that are coming from the actual ngs and reverse light switch.The pictures below show the ngs and rls and the harness/plug attached to it.If you look at their plug shape and pin count and compare them to the harnesses shown in my previous post,youll see they appear to match.



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Old 01-10-2019, 06:56 PM
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Originally Posted by wbrockstar View Post
Both of my harness plugs,going by their shape,appear to match the harness plugs that are coming from the actual ngs and reverse light switch.The pictures below show the ngs and rls and the harness/plug attached to it.If you look at their plug shape and pin count and compare them to the harnesses shown in my previous post,youll see they appear to match.



mine are the same as displayed and stock t5 car,
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Old 01-10-2019, 08:41 PM
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The plug you're holding onto in your very first picture looks more squared off to me vs being more round like mine &,unless Im not seeing your picture clear enough,your plug also appears to have female pins in it vs male pins,which are required to mate up with the female pins in the ngs attached harness plug thats shown in my last post you quoted.IOW- the plug shown in your first picture looks to have the wrong shape & wrong pin type (female instead of the correct male pins) to connect to the ngs harness plug (which has female pins) thats shown in your second picture?? Are the pins inside the plug in your first picture female or male?? ​​​​​
Are the gray harness plugs that are connected in your first picture for your reverse lights?? Im thinking yes.....

Last edited by wbrockstar; 01-12-2019 at 12:16 PM.
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Old 01-10-2019, 09:37 PM
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The following might make things a little more clear.Take a look at the pictures below & pay attention to each plugs shape and the location of its locking tabs.

The ngs plug has 2 square & 2 round sides + female pins.
Your plug has 3 square & 1 round side + female pins.(they look female in the picture anyway)
My plug has 2 square & 2 round sides + male pins.

Also look at the plug locking tabs.1 is on a square side of the NGS plug & 1 is on a round side of the NGS plug.

So if the NGS plug requires a 2 square/2 round sided plug with locking tabs on 1 square & 1 round side of the plug,which plug will connect to it,out of the plugs listed above & shown below?? Your plug or
my plug???


(Your Plug)


(NGS Plug)

​(My Plug)

Last edited by wbrockstar; 01-12-2019 at 12:21 PM. Reason: Added more info
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