Wiring harness... HELP

[SMOKE'N'TYRES]

Sorry for such a noob question but I am finally getting the time to do the sr20 swap and it says I need to use the lower harness from the KA motor. Why is that??? I don't have the lower harness from the KA but do have the lower SR harness, my main question is, can I use the sr's lower harness??? If so, do I need to modify it, and how?? Any help will be greatly appreciated.
The car is a '89 that had a SOHC and will now have a redtop SR20

[allntrlundrgrnd]

i used the sr lower harness and everything seems to work properly. i believe you just need the speed sensor out of your ka tranny and throw it in the sr so it reads in mph.

[FRoSt415]

well theres like two plugs that dont plug up but no biggy. sounds like u have the swap dvd. just watch them do the wiring and u see taht the only reason that they use the ka wire harness is because it has a bigger terminal for the positive pole to the battery. also dont forget about the speedo change the speed sensor in the back
of the transmission

[SMOKE'N'TYRES]

sweet so it will work... thanks for the help

[projectRDM]

Originally Posted by allntrlundrgrnd

i used the sr lower harness and everything seems to work properly. i believe you just need the speed sensor out of your ka tranny and throw it in the sr so it reads in mph.

Completely incorrect. Please don't post if you don't know the answer. The speed sensor is the exact same for all markets, a sensor can't decipher MPH vs. KM/H, the cluster does that. use either one you want and sell the other one.

[allntrlundrgrnd]

my main question is, can I use the sr's lower harness

i used the sr lower harness and everything seems to work properly.

get off my nuts, every other thread ive read on this subject on this forum has stated you need the ka speed sensor.

thanks for clearing it up though

[projectRDM]

Originally Posted by allntrlundrgrnd

get off my nuts, every other thread ive read on this subject on this forum has stated you need the ka speed sensor.

thanks for clearing it up though

You're a gotdamn liar too. I know for a fact I've cleared this issue up at least nine times this year, all because of people like you continuing to 'guess' or 'hope' you're right.

[allntrlundrgrnd]

I am not lieing. i searched about this because i just did an sr swap.

I didnt guess or hope. i said i believe you need the ka speed sensor. i dont have it in my car, but most threads i came across stated you needed to replace the sr sensors with the KA counterparts.

seriously. chill out. its the internets.

[xpertsnowcarver]

ALRIGHT alright... dang.. let OP decide for himself. besides.... projectRDM has dealt with more years of gravity anyways nothing wrong with a correction here and there.

fightin' over lower harness... man, i don't even use one, lol... only thing its good for is reverse lights and maybe neutral safety switch for starting the car.. only thing running down these is my speed sensor which like projectRDM said.. is the same. only auto speed sensor is different from manual. more specifically, if ur swapping ka auto to sr manual, u will need to change the sensor's plastic sprocket if ur sr tranny didn't come with its own speed sensor.

[SMOKE'N'TYRES]

Originally Posted by xpertsnowcarver

fightin' over lower harness... man, i don't even use one, lol... only thing its good for is reverse lights and maybe neutral safety switch for starting the car.. only thing running down these is my speed sensor which like projectRDM said.. is the same. only auto speed sensor is different from manual. more specifically, if ur swapping ka auto to sr manual, u will need to change the sensor's plastic sprocket if ur sr tranny didn't come with its own speed sensor.

I thought there were a few other things that were on this harness too, starter, some ground wires, and the plugs to the fuse box????

thanks for all the help thus far, im gunna use the sr harness, im not worried about the pos batt terminal being to small or reverse lights.

[blueshark123]

i know i had to change to speed sensor if u have a s14 and using a red top

[Black240Ct]

i believe the plugs next to the fuse box from the lower harness have different wire pins from the sr to ka.
if they are you can use the fsm to find what wires are what and move them around in the lower harness plug to work with the chassis harness

[xpertsnowcarver]

the harness that plugs into the back of the fuse box located by the batter is your is your lower/tranny harness. not a critical element to completing your swap. i don't have anything plugged in there.

[g6civcx]

Originally Posted by SMOKE'N'TYRES

he sr20 swap and it says I need to use the lower harness from the KA motor.

Please post the link to the source saying you need to the KA lower harness.

[g6civcx]

Originally Posted by allntrlundrgrnd

i believe you just need the speed sensor out of your ka tranny and throw it in the sr so it reads in mph.

You are wrong. I can walk you through the entire process but I don't feel like it because I personally have done this at least 10 times before already.

[allntrlundrgrnd]

read the fucking thread

[projectRDM]

Still crying I see.

The KA lower harness works fine for a DOHC chassis. A SOHC chassis though is different since the alternator and power steering pump are on opposite sides. It's easier to use the KA harness and cut/splice, but if you don't have it the SR one works too. All you need are starter, alternator, and VSS anyway, the oil pressure switch should be removed and thrown away, plugged or replaced with a real gauge, and the remaining transmission switches serve no purpose. The FSM will clearly detail exactly what plugs are used.

[whowutwut]

You don't need to swap use the KA speed sensor. It depends on the SR year and the 240sx you are swapping into, those have to match up and you can interchange the speed sensors.

For example:
s13 redtop into 89-94 240sx works with the SR speed sensor or KA speed sensor
s13 blacktop (early model) into 89-94 240sx works find with the SR speed sensor <-- I swapped this into my 93 240sx and used the SR speed sensor with no problems.
s14 blacktop into 95-98 240sx works with SR speed sensor

If you're swappinga s13 engine into a s14 240sx, then you will need the s14 KA speed sensor.

I just installed the s13 Kouki Type X gauge cluster, that required me to swap to a s14 speed sensor because it reads a different signal.

[projectRDM]

Originally Posted by whowutwut

You don't need to swap use the KA speed sensor. It depends on the SR year and the 240sx you are swapping into, those have to match up and you can interchange the speed sensors.

For example:
s13 redtop into 89-94 240sx works with the SR speed sensor or KA speed sensor
s13 blacktop (early model) into 89-94 240sx works find with the SR speed sensor <-- I swapped this into my 93 240sx and used the SR speed sensor with no problems.
s14 blacktop into 95-98 240sx works with SR speed sensor

If you're swappinga s13 engine into a s14 240sx, then you will need the s14 KA speed sensor.

I just installed the s13 Kouki Type X gauge cluster, that required me to swap to a s14 speed sensor because it reads a different signal.

Please don't confuse things further. It's not SR vs. KA. It never has been. They're the same. The only thing that determines the sensor is the cluster.

S13 cluster = S13 speed sensor
S14 cluster = S14 speed sensor

The Type X cluster is a rare difference since it's 96+ so it uses the S14 VSS, but it would not matter what transmission you're using. KA, SR, 89-98, both sensors fit all models.

So for the last and final time until next week there are ONLY four speed sensors that exist for the S13 and S14 chassis.

S13 manual
S13 auto
S14 manual
S14 auto

It does not matter where it's built, what engine you have, they're the same throughout every market. CA, SR, KA all use the same sensor. They only change is the chassis.

[g6civcx]

Originally Posted by allntrlundrgrnd

read the fucking thread

I hope you're not talking to me. Please don't make me walk through the entire VSS writeup just to make you feel better. Just search and find out on your own.

Originally Posted by projectRDM

The KA lower harness works fine for a DOHC chassis. A SOHC chassis though is different since the alternator and power steering pump are on opposite sides. It's easier to use the KA harness and cut/splice, but if you don't have it the SR one works too. All you need are starter, alternator, and VSS anyway, the oil pressure switch should be removed and thrown away, plugged or replaced with a real gauge, and the remaining transmission switches serve no purpose. The FSM will clearly detail exactly what plugs are used.

Don't forget the reverse lights!

[FRoSt415]

REpost End of Story

[g6civcx]

Originally Posted by FRoSt415

REpost End of Story

Get out of here with that nonsense. Read above for classification of VSS interchangeability.

[xpertsnowcarver]

mod is gonna /thread cus this is getting dumb. to OP, just search (what i did, and i did my swap in my backyard in less than 12hrs thanks to the abundance of info) and/or listen to projectRDM

[Phlip]

JESUS!!!
Russ spoke it, and I know personally the work he has done.
Ken spoke, and the truths I have seen him speak around leads me to know that he knows his shit.
The questions have been answered correctly, this pissing match is less than necessary.