The RB20 Wiring Thread

Post by **Yellow4g63** » Mon Sep 01, 2003 9:47 pm

Carl H wrote:if you are going to use the ka cluster it is much easier to run the ka lower harness.even if you use the rb lower its not hard to splice in the proper wires much less the reverse lights.

Haha damn I knew I forgot something lol.

Post by **sileighty89** » Mon Sep 01, 2003 9:47 pm

sorry blew the headgasket on my coupe, ive been taking the motor out and dropping my extra ka24e in it. ill try and take the pics tonight

Post by **apex_7** » Mon Sep 01, 2003 9:47 pm

Carl H wrote:if you are going to use the ka cluster it is much easier to run the ka lower harness.even if you use the rb lower its not hard to splice in the proper wires much less the reverse lights.

How do you get the reverse lights to work?

Post by **Jamison** » Mon Sep 01, 2003 9:47 pm

on the efi harness... right where it connects to the ecu, there is like 4 or 5 plugs there (2, 3 wire green plugs and 2 or 3 white plugs). are these used for anything? for the speedo and temp gauges i was gonna just splice them off the main efi harness.

so is it cool for me to just push those plugs aside and not use them?

Post by **HybridOne** » Mon Sep 01, 2003 9:47 pm

this is a cool thread. I'm gonna have to transcribe this whole thing, re-write it so more people can understand, double check the connections with our motors and cars, and post it on the website.see we are all good for something on this board besides flame wars.

Post by **blk90s13** » Mon Sep 01, 2003 9:47 pm

ok i been trying to wire this thing up for like three days now

i know it should not take all that long but i have a thing between me and wires we dont really get along well + my RB was messed with by the short jdm mofos over in the mother land ( japan )

here is a couple questions for the experts out there

1) the plug that have two wire one being the black/ yellow and one being solid white as i understand the black yellow is the starter wire , can i wire it to the starter straight ? ( cant find the male side of the RB plug anywhere ) and if so where does the white wire hook to ?

2) the white wires that goes in the fuse box from the battery +ve terminal hooks up to the thick white/blue wire and to the white/purple wire from the other rectangle rb plug ? do i use a fuse or just wire it up straight ?

3) the brown plug on the ka is not used at all ?

4) the other rectangle rb plug is not used at all ? non of the wires coming out of it hook any where ?

some pics for reference

three white wires come off +ve battery to fuse box use anyone of them right

the brown plug on the ka harness is not used at all ?

thick white/blue wire to +ve battery terminal

skiny white/red wire to skiny white/red wire

at last the very famous two wire plug that is driving me nuts black/yellow and white

if i follow steps i should hook blk/yellow to blk/white ( thats for the starter ) well my starter does not have black white it have black yellow and wut happens to the white wire ?

Post by **Project240** » Mon Sep 01, 2003 9:47 pm

blk90s13: That red plug in your 2nd and 3rd pics, the one that comes off the fuse box and has a little spade connector coming out the end; what color plug do you have plugged into it?? On my car I don't have that red plug, but I need to know which plug connects into it so i can wire it up. Is that the green and orange plug going into it, with two white wires going into that??

Post by **blk90s13** » Mon Sep 01, 2003 9:47 pm

i have two connectors that go into it

one being black and one bing green both have white wires coming out them the black one have a thicker white wire the green have two smaller ones

thats the wires coming off the +ve terminal off the red plug

my problem is my car had an sr for over a year and the wiring was done by a freind of mine so i have no clue wuts SR wiring and wuts KA wiring

then on the RB it goes the same way wuts auto rb harness and wuts manual rb harness

Post by **Project240** » Mon Sep 01, 2003 9:47 pm

So basically all three of those white wires (from the green and the black plug) run to that red plug? (which is then going to connect to the positive battery terminal)

I don't have the red plug so what I'm figuring is, I could just cut the green and black plugs off and connect those 3 white wires to one side of the positive battery terminal...

Post by **NISMObuttnutz** » Mon Sep 01, 2003 9:47 pm

Neither of the white wires in those pics are the ones you want, those ones are for your headlights/wipers etc. The white one you want is wrapped in the black loom that is uncovered in the pics. The plug where the black/yellow and white wire is on, you use the black/yellow for the starter.

To answer the questions 1)the black/white starter wire is on the RB rectangle plug where the white/red alt wire is. in your pics it looks like it's black/yellow where mine is black/white I'll attach a pic to show you

2)the white wire is in the loom, you don't need to worry abotu a fuse cause it has one inline with it already in the fuse box.

3) I think the fuel pump wire might be in the brown plug, but I just wire it in right out of the fuse block.

4)the starter wire in on that plug as well as the white/red form the alternator, here is a pic of that plug with the starter wire and the alt wire.

Email me or AIM me if you need a bigger pic aim is NISMObuttnutz Email is [email protected]

Post by **Project240** » Mon Sep 01, 2003 9:47 pm

OK, I've finished the wiring completely (that is, the 7 steps in the wiring guide, plus the connecting of the battery terminals and the extending of the O2 and MAF wires), so according to the guide my car should fire right up now. I'm just concerned, since I still have an awful lot of loose wires laying around, as well as a bunch of plugs that aren't plugged into anything (i.e. there's like 3 plugs on the upper RB EFI harness just hanging free, as well as 1 plug on the lower engine harness and a plug or two on the KA engine room harness). Is this normal? Or should every plug have a home by the time I'm finished?

Post by **Andrew85cm** » Mon Sep 01, 2003 9:47 pm

I have a couple of questions.

1.) Where are the reverse lights wires? Are they the wires coming from the transmission. What color are they and where do they connect?

2.) I have 2 sensors coming from the transmission. What are they and what do they plug to? I assume one is for the reverse lights but the other I have no clue. Actually come to think of it my wires were cut and aren't any color so colors would not be useful.

3.) What are the sensors located on the side of the block? I believe they are green. There are two of them and I broke one while removing the engine for the 3rd time. I just was wondering what I broke so I can replace it. They are on the intake side of the engine.

My gauge cluster sucks by the way. I can't get anything to work and I wired and rewired that piece of **** several times. I don't know what the deal is.~ANDREW~

Post by **Jamison** » Mon Sep 01, 2003 9:47 pm

Andrew85cm wrote:I have a couple of questions.

1.) Where are the reverse lights wires? Are they the wires coming from the transmission. What color are they and where do they connect?

2.) I have 2 sensors coming from the transmission. What are they and what do they plug to? I assume one is for the reverse lights but the other I have no clue. Actually come to think of it my wires were cut and aren't any color so colors would not be useful.

3.) What are the sensors located on the side of the block? I believe they are green. There are two of them and I broke one while removing the engine for the 3rd time. I just was wondering what I broke so I can replace it. They are on the intake side of the engine.

My gauge cluster sucks by the way. I can't get anything to work and I wired and rewired that piece of **** several times. I don't know what the deal is.~ANDREW~

1. the reverse switch comes form the trans. im not sure about the rb lower harness, but I used the ka lower harness and I swapped the sensors out of my ka trans into the rb trans (including the electric speed sensor). so for the ka harness the wire colors are green/light blue and green/yellow (i think... its the only 2 wire connector with 2 green wires in the loom). also i think the reverse switch sensor is the sensor closest to the block. it is on the side of the trans and it is the lower of the 2.

2. the trans should have the speed sensor, reverse switch and i think the neutral switch, which you dont need anyway. all of the wires that connect to the sensors on the trans are yellow on mine. it doesnt matter which wire goes onto the sensors on the trans. meaning there is 2 hooks on the reverse and neutral sensors, you cant hook the wires up wrong to them.

3. the sensors on the side of the block i think are the knock sensors... one is for 1-3 the other 4-6.... not sure though.

on a side note... I just got done wiring this pos together and all of the lights work except the turn signals. anyone have any clue why?

also has anyone made a ka o2 sensor work on an rb? i dont have an rb o2 sensor. is the rb o2 sensor a 3 wire?

Post by **Andrew85cm** » Mon Sep 01, 2003 9:47 pm

Carl H used a 200sx turbo o2 sensor and it works and fits. It is from some late model 80's car. I will have to ask him which one he used. If your's is bad I suggest you get one of those. I don't think the ka one will work well.

I figured they were knock sensors. I hope I can find one or a 300z one fits or something. Where exactly do the sensors on the transmission tie in to if you aren't using the KA lower harness. Is there a plug anywhere I can splice them in. I don't want to switch the RB and KA lower harnesses because that would be a ridiculous amount of extra work because I have already wired all the lower harness wires to the 240sx.

~ANDREW~

Post by **gani** » Mon Sep 01, 2003 9:47 pm

all this confusion is coming up coz guys are not useing the easy way out. just bloody use the ka lower harness then everything for your charging system is hooked up. swap the sensors from your ka to the rb transmission that you dim important which i would say just put in the speed sensor and you are good. wire in the rest of the wires. note the white/purple wire gets wired to the white wire coming from the ignition switch fuse it in the big bundle of wires from the fuse box just follow it if you are not sure coz there are several white wires there. about the gauges use the the white small plug on the rb harness thats near the ecu plug you should see all the wires that you need on it ( the fuel pump wire should be on it too). with all this your motor should fire up and everything should function as it should took me 25 minute to do all this. easier than the sr wiring if you as me. just my 2 cents...........

Post by **Carl H** » Mon Sep 01, 2003 9:47 pm

using the ka lower is the easiest way to go, no doubt about that.but if you have never wired a car or are not familiar with the transmissions , splicing the ka lower harness in may be a PITA.i know for me it was better to use the rb lower because im using the rb cluster and there are wires on the lower harness that goto the cluster.the orang plug isnt used, but can be to connect the black/red fuel pump wire too, cleaner and no tapping into the wire bundle near the fuse box.also you can get the ka lower harness plug and use the white/red wire on that to connect the rb white/red stripe wire to.a 1984 200sx ca18et o2 sensor will work just fine.plugs right in and the vable is just the right length to go into the rb o2 connector clip.

Post by **blk90s13** » Mon Sep 01, 2003 9:47 pm

well its wired and all BUT

it wont cranck

it clicks only the starter does this click click noise but does not turn over and cranck so i have no clue wuts happening now

every thing seems fine tho fuel pump comes on all accesories work nothing seems wrong to me battery is good too

Post by **gani** » Mon Sep 01, 2003 9:47 pm

go through all your connections and you can try just turning the key on and jumping the starter and see if the engine starts.

Post by **BoostFab** » Mon Sep 01, 2003 9:47 pm

blk90s13 wrote:it clicks only the starter does this click click noise but does not turn over and cranck so i have no clue wuts happening now

the battery might not have enough juice. check on that.

Post by **blk90s13** » Mon Sep 01, 2003 9:47 pm

battery reads 12.89 volts i already done that

i disconnected the +ve wire on the starter ( black yelow ) and tried to start it it didnt click at all

i am thinking it needs a nice hammer so it crancks up

non of my freinds came over to help so i cant be in driver seat / under the starter at the same time

Post by **NISMO_RB25** » Mon Sep 01, 2003 9:47 pm

I know this sounds stupid, but check your battery terminals where the wire goes in. a little corrosion there will prevent you from getting enough juice, and it will just click. My RX-7 wouldn't start the other day, and after tearing my dash apart and tracing every wire, it turned out to be corrosion inside the terminals. I cleaned them, and it started right up. This probably isn't your problem, but you should atleast rule it out.

Post by **blk90s13** » Mon Sep 01, 2003 9:47 pm

rolling it out is not an option car have nothing on the front end as of yet no susp no brakes nothing

also its behinde my other S13 that is not running either haha

the battery is super clean i got two new connectors as well cuz old ones didnt look very pretty

Post by **NISMObuttnutz** » Mon Sep 01, 2003 9:47 pm

It's the battery, if it reads 12.89 voltd while it's sitting there, put the voltmeter on it and have a friend crank it, my guess is it'll drop to around 4-5 volts, try that and let us know.

The RB20 Wiring Thread

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