I searched, still need help! Wiring specialties trans harness.

[Lrn2Go]

I've done lots of searching here on Zilvia, other forums, and google, and I can't seem to find out any answer to my specific set of questions. I'm using the instructions included with my harness, but you can see them HERE for reference. Since this is basically the last thing standing in my way from starting my car, I'll ask that you all humor me and help me understand this and get it knocked out. Thank you ahead of time!

I bought the wiring specialties engine and transmission harness for my s13 black-top sr20det. I plugged 95% of everything right in, no issues... EXCEPT, for 2 plugs on the transmission harness, and I'm really struggling with it. This is all on the passenger side fuse-box. My vehicle is an s13 that used to be an automatic.

In the picture below I've drawn out my problem. The "Green" line is the "main" transmission harness (alternator, starter, trans sensors, etc) that comes up and plugs into the side of the fuse box. Problem is... on that "main" transmission harness, only 2 of my plugs plug in. Step 5 in the Wiring Specialties instructions claims that...

"The three plugs seen in the picture need to be connected to the
bottom side of the fuse box of the S13 240sx chassis (across
from the alternator). Each connector will only mate to its
designated spot, so no mistake can be made. Please ensure
that each connector is secured in its location and covered by
the dust shield."

The "Red" line is (according to Step 6 in the instructions) supposed to be used for auto to manual conversions (which I'm doing, since I have an auto front/body harness... right?). It says...

"The Wiring Specialties Transmission harness is designed to
work with an Auto-Manual conversion. The 3-wire connector
located by the starter connects to an extension with 2 grey
plugs.
For Auto to manual conversions, connect the two Grey
extension plugs to the firewall-side of the fuse box, where
4 chassis plugs are located."

It's got 2 plugs... one goes in the plug that's under the fuse box (the one you use a jumper wire on for the auto/manual conversion normally), and then it has one more plug... which is exactly like my "left over" one from the "main" tranny harness. They both can plug into the grey middle connector (which I have this auto/manual harness plugged into in the picture).

There is NOTHING plugged into the brown plug in this picture... just a wire that goes under the fuse box from the auto/manual 2-wire plug (that I think I need, as per the instructions?).

So my question is... is this right? What am I doing wrong... and what are these extra plugs for? Should my auto/manual plug (as seen in the picture), or the main transmission harness plug be plugged into the middle grey plug on the back of the fuse box?

[SLiDe_WaYz]

You need to splice that plug into the fuse box plug. I had to do basically the samething.

[Lrn2Go]

Originally Posted by SLiDe_WaYz

You need to splice that plug into the fuse box plug. I had to do basically the samething.

Umm... I don't understand.

There are lots of plugs going on here... 5 of them actually. 3 female plugs (the 4-wire on the side/top, the brown on the back/bottom, and the top/back one), and 2 male plugs (one attached to the "main" transmission harness, and one that's part of the auto-manual extension wires... which are physically identical, though wired/pinned differently).

[fliprayzin240sx]

You're best bet is email Yury, he's pretty good replying back about questions like this within 24 hrs.

[Lrn2Go]

Originally Posted by fliprayzin240sx

You're best bet is email Yury, he's pretty good replying back about questions like this within 24 hrs.

Yeah, I'm in the middle of doing that too. When results are needed quickly, I find a broad spectrum of questioning reliable and semi-reliable sources helps the most.

From what Yury is telling me (if I'm understanding correctly)... the brown plug isn't used. The 4-wire plug that you see at the top right of the picture is supposedly a "rare" and "unique" plug that crops up on very few 240's... and I'm not sure what makes it happen. Yury is saying that I need to cut or splice in the 4-wire plug from an older transmission harness that was in the car instead of the free/unplugged plug also seen in the picture coming off the main harness.

However... since I don't have that plug (my shell didn't come with a transmission harness), I'm going to have to see if I can splice in the female plug-side from my jdm fuse box... I'll see how that works out when I can get back to my car.

[fliprayzin240sx]

I was in the same boat as you when I was doing my RB25 swap. The harness got extra plugs to be utilized for both S1 and S2 engine.

[Lrn2Go]

Here's a video showing my issue, and what *MAY* be the solution... but I don't know how to make it happen...

[Lrn2Go]

Okay... just to follow up in case someone runs into this problem in the future... here's the solution.

My issue (if you can't tell in the video) was that I had a 4-wire female plug on the side of my fuse-box that the transmission harness needed to plug into. The issue was, the transmission harness had an 8-wire male plug. So... since I had the fuse box off of the JDM sr20det swap (and not the USDM ka24det trans harness), I cut off the 8-wire female plug from it.


The solution was to just clip the 4-wire female plug off my fuse box and match up the colors. There is a white-pink, yellow/white, yellow/black, and a yellow/blue wire on both plugs... so you solder them together. The other 4 wires I just taped up. Yury with Wiring Specialties says this is just fine... and the car seems to be running fine now. :nod: