How to Wire a 89-91 Nissan KA24E Into Anything - but Mostly a Datsun 620 - In Depth Wiring Explained

*Do not ground the circuit board of the Can/Am Box.
How to wire a 89-91 Nissan KA24E into a Datsun 620, but applies to most anything in general. Maybe your Datsun L-Series boat or forklift needs an upgrade?
Wiring harness walkthrough as well as ECU Diagram explanation.
Bypassing the stock 620 Voltage regulator for an Internal Regulated alternator on the KA.
Using the stock 620 system to keep the gauges working as well as the stock ignition switch.
Links:
Thanks to Jeff/Icehouse for starting ratsun.net, this thread and general sharing of Datsun/Nissan knowlege. I got most of what is in this video from this thread, thanks also to those that contributed.
How to wire a KA, CA, SR, and VG into anything
ratsun.net/top...
Diagram Links - some of these are large for detail and may take time to load
Some are direct from the Service Manual, others are downloaded from here and there.
Verify your wiring with the diagrams from the service manuals of the vehicles involved in the swap.
89-90 KA24E EFI Harness
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89-90 KA24E ECU Diagram
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89-90 KA24E ECU Pinout Diagram - This was found thru google, thanks to whomever di the hard work.
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89-90 KA24E Relay and Can/Am wiring. This is showing 2 methods of integration.
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1974 Datsun 620 Wiring Diagram
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1974 Datsun 620 Voltage Regulator Bypass Wiring
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1974 Datsun 620 to KA Ignition Wiring
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1974 Datsun 620 Wiring to KA24E Start and Dash integration
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1977 Datsun 620 Wiring Diagram
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Wiring Specialties has all sorts of Nissan connectors.
They also build complete new harnesses.
These are the connectors that allow you to run an uncut 240SX Engine Harness
RHD 180sx S13 Dash Interface Male connector - Engine harness side
www.wiringspec...
S13 240sx Power Interface Connector MALE
www.wiringspec...
Brown 240sx S13 Chassis Interface Connector MALE
www.wiringspec...
Datsun Service Manuals
www.nicoclub.c...
Auomotive Wire Size Calculator
www.wirebarn.c...

[@tyler-dum-asf]

That ecm wiring spread sheet was so beyond useful, thanks a ton for the info, made wiring the swap into a subi GL a breeze. Downloaded this video for reference later lol

[@i2edeye]

Glad to help. Love some subi gl :)

[@henryvargas9561]

I appreciate you posting this video, it was beyond help trying to identify one of them that I had no clue what was it for or where it goes

[@i2edeye]

Glad to help :)

[@allcitys1363]

Just wanna say thank you for posting this. I just picked up a 240 and the wiring is an absolute mess. This will be super helpful when it comes time to cleaning it up!

[@i2edeye]

Glad to help :)

[@97VobraOwner]

Not all hero’s wear capes- you sir are amazing, thanks for posting

[@i2edeye]

Thank you :)

[@mileshall4266]

Thank you for the video work. Very helpful

[@i2edeye]

Glad to help

[@Combustable12]

Is there any way i can get ahold of you? Your the only person that has shown this stuff. I am trying to get my ka24e engine running in a 77 620. I have the #11 box. And wiring is my worst subject.

[@i2edeye]

You can contact me on IG under the same name as here or on ratsun.net member name is ]2eDeYe there.

[@naksgarage1555]

Quick question. Currently wiring this to my 86 via can am box. Trying to figure out where to wire the Orange Start signal wire that originally goes to a fuse box on the KA. Any tips.

[@i2edeye]

Orange wire is the start signal to the ecu, it goes to the starter signal wire (key start) and lets the ECU know the starter is turning.

[@aliashtiani8246]

great info, is it possible to upload this without the guitar music im having a very difficult time hearing

[@i2edeye]

Already done. :) kzbin.info/www/bejne/ZmTKgXmndpyHd6c

[@aliashtiani8246]

@@i2edeye score!!!!!

[@rickd5742]

Please repost with out the music it’s kinda hard to hear ya. Either way Lots of good info thanks bro

[@i2edeye]

Can do.

[@rickd5742]

@@i2edeye thanks! im actually in the middle of the exact same project. im restoring my dads 1978 620. this video will be extremely helpful.

[@i2edeye]

@@rickd5742 Should be up sometime today. :)

[@stavbersosa2458]

what does the red check engine light ground switch wire on the chassis connector to gauges go to??? is it to be used as the dummy light for the alternator to charge??

[@i2edeye]

It goes to the check engine light on the dash in the 240sx. I ran it to a light I bought on amazon that I put in the delete plate on the dash. www.amazon.com/Taiss-Indicator-Engine-Yellow-F-010-FDJ-Y/dp/B097SDGDPY/ref=sr_1_7?crid=2MFQJYISJ1R15&dib=eyJ2IjoiMSJ9.PPSzVAmu-sJ6CeaHe6a8Mz5Wj0doYcz66_yeMVjRCEHy2t6ww6oZnpQhQH7T3KVKjwnl0_6Agvv8Vx1_SbUqQBmr2vWMhLRhIcC-MxPT7Wkt4Qa0256e-0W88MDPJV365Cbhr7d2STdApyxVc1xmzUd8rqoMF53LQ8l-ANI_w6Rn9Mjh2HJ-_lpCihGunnNy9xOR3PcVmLrlAqxHRzYUiYjGn9jh8IiEkGV2uxJNCYz_h9dhR2q2G6OL-AAdejomPGch2mCGN7MTo66lBWiicrq66hlHftryjh0_PY367uw.K1RrSAS6vHQQzHFIu0JFHBa_oN5-KN0hrzYKkoq1G9M&dib_tag=se&keywords=check%2Bengine%2Blight&qid=1718804097&sprefix=check%2Bengi%2Caps%2C174&sr=8-7&th=1

[@stavbersosa2458]

@@i2edeye awesome thank you very much, wiring my 710 wagon today with a ka24e... also the other red wire, from pin 46 on the ecu, does that get constant 12v?? like it goes straight to the battery with a fuse??

[@stavbersosa2458]

@@i2edeye okay i got the red wire (pin 46) figured out.. For the orange wire for start signal where does that go on the starter??

[@i2edeye]

@@stavbersosa2458 Yes it is the ECU back up power or memory.

[@i2edeye]

@@stavbersosa2458 The orange wire tells the ECU that the starter is spinning, it ties into the start signal wire from the ignition switch to the starter.

[@jonhromeo6108]

Maybe do a actual video of step by step if u get a chance

[@i2edeye]

I do plan to film a complete install. It will be a while though as I don't have a swap and am waiting for a friend to get to that point in his build. If you get the wiring specialties plugs for the stock harness and the can/am box it is almost plug and play.

[@pitbull52331]

I’m having a hard time understanding this. Haha. So do I need to only cut wires at the oem realy plugs and plug them into the can am box? I watched the video and read the diagram just don’t exactly understand where this can am box needs to be located

[@i2edeye]

Yes, that is what you are doing. It will be close to the ECU. I put mine on the package tray on the passenger side.

[@pitbull52331]

@@i2edeye thank you for the quick reply. So your ecu is under the hood as well?

[@i2edeye]

@@pitbull52331 Under the dash

[@pitbull52331]

@@i2edeye okay so all the wires from the relay plug box run inside to the canam box as well?

[@i2edeye]

@@pitbull52331 You should contact me on IG or FB. It is a bit easier over Private Message.

[@jeremiahpanic7559]

I wanna do this swap into my 1986 nissan 720.

[@i2edeye]

I have mounts for this swap. You have to go rear sump though.

[@bradleyabbott3504]

I know this is a long shot but would anybody be willing to sell me one of those can am wiring boxes, the guy stopped making them and he said he doesn’t know if or when he’ll start making them again

[@i2edeye]

Dastin Motorsports had a used one for sale. It is easy enough to wire up to 3 relays, the can/am box just packages them nicely.

[@MrStacy1974]

Does sr20de wiring require similar if not the same process?

[@i2edeye]

It is similar. Diagrams can be found here ratsun.net/topic/537-how-to-wire-a-ka-ca-sr-and-vg-into-anything/

[@MrStacy1974]

@@i2edeye I've been lurking on ratsun for a while , it looks like I'll have to join sooner or later .... lol

[@i2edeye]

@@MrStacy1974 Do it :)

[@jonhromeo6108]

Damm wish i was better at reading it lol or even have courage to try it

[@i2edeye]

Wiring can be a pretty daunting task, I am hoping this video helps take a bit of the mystery out of it this specific swap at least.

[@jonhromeo6108]

@@i2edeye it did actually thanks my man 💪👍

[@garagemonkey526]

I just need to learn how to read wiring diagrams

[@i2edeye]

You are not the first person to say this. I will work on a video going over the 620 wiring diagram.

[@garagemonkey526]

@@i2edeye I’ll look out for it!

[@SRZRB]

What gauge wire do you use?

[@i2edeye]

I recommend using the same size wire as factory minimum. 14 gauge is usually good for most things on the ka, maybe a bit on the big size but bigger is better than smaller.

[@aliashtiani8246]

sent you DM on IG

[@i2edeye]

Got it