Wiring Issues

Discuss the RB20, RB25 and RB26 series engines.
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jedimind240
Posts: 69
Joined: Mon Oct 16, 2006 8:33 pm
Location: Evansville, IN 47713

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Ok, so i need to know what these connect into

And do i use these wires from the fuse box

And what are these wires that go to RB alternator part of the harness.

I look at a wiring diagram and lose my mind, i just need to know if i need to do anything with these, i've searched and just need some insight, im not really sure what i need to do with all these. Thanks.


RBnMY240
Posts: 50
Joined: Tue Jan 13, 2009 8:23 pm
Car: 240sx coupe
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hey sirrr you are having the same problem as meh lol take a look at my post

zer...lease even tho im still a lil confused lol

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jedimind240
Posts: 69
Joined: Mon Oct 16, 2006 8:33 pm
Location: Evansville, IN 47713

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OMG, it is like the exact same problem. So im guessing the large brown rectangle plug is unused, and the smaller plug is for the sub harness. It doesn't make any sense that all the fuses for the fuse box don't get connected to the harness IMO. Thanks for the help though, its one of these little problems thats driving me crazy with this build.

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jedimind240
Posts: 69
Joined: Mon Oct 16, 2006 8:33 pm
Location: Evansville, IN 47713

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Also, i saw you were using the greddy Intake mani, how did you hook up the coolant lines, thats my next step and im a little lost with that.

RBnMY240
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Joined: Tue Jan 13, 2009 8:23 pm
Car: 240sx coupe
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like all the hoses under the intake manifold? ill take a pic for you wen im out of school, pretty much everything stays the same but some hose are clipped shorter, but ill try to get you a picture of mine.

RBnMY240
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Joined: Tue Jan 13, 2009 8:23 pm
Car: 240sx coupe
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pretty much i followed this dudes write up ^_^http://www.skylinesaustralia.c....html

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jedimind240
Posts: 69
Joined: Mon Oct 16, 2006 8:33 pm
Location: Evansville, IN 47713

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Thanks man, its finally warm and not raining so i can finally get some work done.

RBnMY240
Posts: 50
Joined: Tue Jan 13, 2009 8:23 pm
Car: 240sx coupe
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hey i guess we are suppose to use the ka lower harness instead of the RB i think all you have to do is use the oil sender plugs and add the knock sensor wiring from the RBhttp://forums.nicoclub.com/zerothread?id=79995take a look?did you find out how to do the hoses on the intake? i cant really get a good picture but that write up seams pretty clear, if not i can send you a picture thats a lil clearer from that write up (using microsoft paint) :P

RBnMY240
Posts: 50
Joined: Tue Jan 13, 2009 8:23 pm
Car: 240sx coupe
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here is wut i did, hopefully its right lol

used these wires from the RB and put them in the KA harness


RBnMY240
Posts: 50
Joined: Tue Jan 13, 2009 8:23 pm
Car: 240sx coupe
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with the lines, i didnt know wut one you were talking about so i used both pictures



hope that helped ^_^ and i hope thats right lol im still new to this too

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egamarine
Posts: 16
Joined: Tue Feb 09, 2010 4:01 pm
Car: 91 240sx rb25det

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what are those two sensors in the block right there in the picture with the intake manifold off?? Right where the red and blue lines cross. A wire got pulled out on my rb25 and i need to know so i can try and repair it thanx in advance nate

rb25det250sx
Posts: 443
Joined: Sat Feb 07, 2009 9:20 pm
Car: '96 Nissan 240SX RB25DET powered!!!
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Knock sensors, those are key, clutch, and crutial. should pry hook those back up before you start your car up. i dont think it would really hurt anything if your car is fine, it just might put it in limp mode.

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egamarine
Posts: 16
Joined: Tue Feb 09, 2010 4:01 pm
Car: 91 240sx rb25det

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Yea the car runs fine just like you said puts it in limp mode cause of the dummy signal its gettin bc its not hooked up now can i pull that sensor apart to rewire it because the whole wire came out of the back of the sensor and i dont wanna try and find a new one prolly wont be easy to come by

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Carl H
Posts: 5985
Joined: Mon Aug 04, 2003 4:09 am
Car: 1995 Nissan 240SX SE RB30DET

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without the knock sensors connected or bypassed the engine will run like complete garbage.

rb25det250sx
Posts: 443
Joined: Sat Feb 07, 2009 9:20 pm
Car: '96 Nissan 240SX RB25DET powered!!!
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mine ran fine and was still drivable, but it just didn't have the power it should of had.


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