S13 sr20 harness to s14

[Gearhead9992]

OK so I'm going to buy a S13 sr20det type x from my buddy that's coming out of a S13 and going into my s14 is there anyone out here that can take my s14 ka harness with the S13 Sr harness to make it work instead buying a new harness

If there is some that can I can bring some more business as well

[TheRealSy90]

Use the s13 sr20 harness from the engine and re-wire the chassis harness integration plug that connects under the dash. That should be all you have to do. I'm sure there's many write-ups online on how to wire an s13 sr into an s14.

[Gearhead9992]

By the way it already has a wiring specialties s13 harness and factory Sr ecu so I just want to convert it to s14

[kyral]

You have to find and splice the red and grey connectors on the s13 sr harness side into the corresponding wires on the s14 chassis.

ive done a lot of looking into this, the wires you need are going to be the same color on both the chassis and harness side its a matter of finding them on the car itself

Check the EL section of both the s13 and s14 fsm

and of course your tach wont work

[Gearhead9992]

Yeah I figured but my tack and speedo don't work anyway I'm sure there is a way to get it working but I'll have to get a new one I'm just waiting on my buddy to pull the motor out of his so while I'm waiting I'm trying to figure everything out so that I'm ready

[kyral]

Yeah I figured but my tack and speedo don't work anyway I'm sure there is a way to get it working but I'll have to get a new one I'm just waiting on my buddy to pull the motor out of his so while I'm waiting I'm trying to figure everything out so that I'm ready

find where the engine harness plugs into the chassis

[Kingtal0n]

I remember doing this like 10 years ago. The S14 chassis uses an "F3" plug to carry all of the engine harnesses wires into the chassis at pretty much that one single plug.

I made this so long ago
http://3.bp.blogspot.com/-XPvWdsXJ-lA/Tf2tB0Z8CmI/AAAAAAAAA80/XiDMRzeI8Qk/s1600/f3plug95240sx.jpg

All the years are not the same, 95, 96, 97, 98 chassis wiring in S14 are all different in some ways

[Gearhead9992]

So would I be swapping multiple plugs from s13 into one single s14 plug?

[Kingtal0n]

it isnt many, maybe two or three plugs from the s13 harness, and they are mostly right next to each other. The weirdest part will be all the length you remove- at some point it will hit you that the part of the s13 harness that runs to the engine bay needs to get shortened so that it only goes from the ECU -> F3 plug. So its like several feet of harness you get to remove.

On the other hand, you could leave all that length AND the original plugs, and just curl it up in case somebody wants to use it for an S13 again later. You would then only need to tap into those wires near the computer. The reason this is still more work is because to make a clean tap you need to cut and re-soldier the wire anyways. All wiring needs to be heat shrink + soldier for best results... IMO