I got bored at 5:10am for looking for a sr motor, so I went to srswap.com and copied the wiring diagram, for the lazy bastards, to show how to do it yourself, and save a few hundred dollars!!!

There are 2 plugs on the end of the KA harness and 3 plugs on the SR harness that run up behind the stock battery location. Although the plugs do initially snap together, the wires do not line up and you have to cut the plugs off and connect the wires using the table below. Cut the 2 main KA plugs off the KA harness and splice them onto the SR harness.

red lines are SR Harness
blue lines are KA Harness

SR Harness Wire Color
Used For
KA Harness Wire Color

Black / Pink stripe
Fuel Pump Relay
Black / Pink stripe

Green / Orange stripe
Transmission Neutral Sensor
Green / Orange stripe

Red / Black stripe
ECU Relay
Red / Black stripe

Green / Yellow stripe
AC Relay
Green / Yellow stripe

Red
ECU Backup Power
Red

Black / Red & Blue / Red (Note: connect 2 wires to 1)
Main Ignition Power
Black / Red stripe

Black / White stripe
ECU Power
Black / White stripe

Blue / Green stripe
AC Relay
Blue / Green stripe

Black / Yellow stripe
Idle Air Control Valve Power
Black / Yellow stripe

Brown (to O2 sensor)
O2 Sensor Power
Any 12v switched source


my source

like I said I got really bored in the early morning of easter, so all you freeloaders here you go, please quit asking for the wiring diagram.

sorry if this has been posted before, I searched but didn't see it, so here you go!

 

Are you going to type up the rest of it? There is another plug you gotta do work to.

Start signal
Tach signal
Speed signal
CTS signal to gauge
MIL signal

Your "Guide" wont even start it easily. Anyone who uses it will need to blip the throttle for the motor to even fire.

It is pretty irresponsible to post half the info & call it a diagram...

Everything you have is correct, you just dont have it all

 

YO, I didn't say it was my guide, I got the info above from Heavy Throttle, and COPIED it to here!

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ECU & Dash wiring

The colors on the wires that run from the ECU up into the dash matched up perfectly on both the SR ECU harness and the KA dash harness:


Wire Color
Used For

Yellow / Red stripe
Tachometer signal

Yellow / Green stripe
Speedometer signal

Orange
Ignition start

Black (may be more than one ground)
Ground

Blue / Green stripe
AC signal

Blue / Black stripe
Water temp signal

The rest of the wires are for the CONSULT diagnostic device. It is not necessary to connect any other wires than those listed above to get the SR to run properly.

Connect the remaining wires if you plan to use the onboard diagnostic CONSULT connector.

The Apexi turbo timer is connected to the O2 sensor wire at the ECU to provide auto countdown functions. The Apexi AVC-R is also attached to the ECU harness for tachometer signal, speed signal, and throttle position. Apexi products come with a very good ECU pinout diagram that is extremely useful.

Remove the brackets from the SR ECU to make it easier to mount.

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There you go the rest of what Heavy Throttle has on the wiring!!!

 

Yellow / Red stripe
Tachometer signal

Yellow / Green stripe
Speedometer signal

Orange
Ignition start

Black (may be more than one ground)
Ground

Blue / Black stripe
Water temp signal


All of this was omitted in your origional "guide" I think if you are gonna do it, do it.

It's nice that you did it, dont get me wrong...Being in the wiring business, I know how lazy and stupid alot of people are and by you posting up HALF the info, some would think its actually ALL of the info. What you did was great in theory, however by halfway doing it you actually did alot of people a greater diservice that not doing it at all because they would do everything you said & think its all done.....believe me.....I have heard EVERYTHING.

 

well i wasn't done with the post yet, I forgot to put that in there, but either way its complete now!

its finished!

 

Just the other day, I can not start my 240sx w/ SR20DET swap, but, I couldn't tell why. I looked in my engine bay, by the starter wires and pass. side engine mount, and realize two wires are disconnected (a brown wire and a black wire), but, I am not sure from where. Hoping someone can tell me where they are suppose to be and where they are connect to or not connect to anything at all. Now my car doesn't even turn over or click, but, it has power. Please help. Thanks in advance.