Giving me a wiring harness and being bored are a fun combo

[Hijacker]

So I've been itching to do some wiring work lately with no good outlets. I finally found a good outlet a week or two ago when I bought a front main harness from a base model 5 speed S13 that was being parted out. My car has had electronic bits hacked off of it so much over the years, that I figured that I could eliminate quite a bit of wiring. No pop ups, no cruise control, no automatic control unit, you get the idea. So with a wiring manual in one hand, and a sharpie in the other, I sat out to make a custom front main harness for my car.

Step one was to trace out the shape of the harness on my work surface. I took my sharpie and traced out the outline as well as where clips went so I would have a good approximation of where things would go back together. I've got no good pictures of that step, but I wasn't concerned with documenting that kind of stuff. I did take plenty of pictures of what the harness looked like before I sliced it all to hell.

After I removed the looming, I started looking at what circuits I should remove. I removed everything associated with the pop ups, all the wiring from the SMJ to the relay boxes, including the relay bases. I left one circuit in place to continue running my fog light setup. I also removed all the A/C pieces, and adapted the fan relay to run my e-fan. I also hijacked the circuit for the neutral switch and am using it for a future oil pressure sending unit for when I put in an aftermarket unit. All I'll have to do is access the SMJ on the interior side and add a wire in there. I also removed the circuits for the 4th and 5th gear switches. Never used them in the beginning anyways. I also pulled the clutch interlock relay and the clutch switch. I've been running for years without one, and the cannucks don't use it, so I figure it's one less expensive thing that can break.

Things I added were an ignition coil relay, in the spot in the relay box for the ignition coil relay. I've gotta scavenge a larger gauge connector from my harness in the car before I finish that bit up. I looked at how the factory does its fog light setup since there's no documentation on it, and it's stupid simple. They run a wire from the low beam to a relay solenoid, then they run that to the switch. When you turn the switch on, it grounds the circuit and completes the fog lights' supply circuit. I adapted that to run off the low beams and run back to my pop up switch.

All in all, once I tallied up the amount of crap I removed, I came out to 24 circuits removed and 4 relays plus a handful of plugs.


All the wires I removed.


The harness cleaned and reassembled! I still need to button a few things up, but I need to scavenge plugs from my car first.


I thought about removing this box completely, but I didn't have enough room in the other box to do that


I need to snag a green or blue relay from my car to put in the fan relay spot.

[motoman399]

very nice. you should weigh everything and see how much it is, then go sell it for scrap lol.

how long did it take you?

[Hijacker]

Been working on and off with it for a week and a half now. I'm super anal about things so probqbly have way too many man hours in it.

[kyhunter89]

you consider that fun... feel like doing a free wire tuck...

[Hijacker]

Yeah....these wiring hands don't do anything for free

[breadbox]

so your manual popup button is now a fog switch? I like that.

[Hijacker]

Yep. I turned it into my fog switch years ago when I did my silvia conversion. Of course, if I could ever land a real fog switch, I'd make some wiring changes in a heartbeat to allow for that to plug in.

[mudvayne9790]

i have a fog switch somewhere around my house

[krash]

Hey hijaker, if you want a fog switch, check out the one from the 1990-1995 pathfinder. Fits in perfectly next to the O/D light:







Its really easy to wire up. And now you have all that nice Nissan factory wiring to use for it. I wouldn't scrap that if I were you. I love using factory wiring to wire stuff up haha

[motoman399]

how about this one from a euro s14




it plugs directly into the factory s13 fog light switch.. you can find them on the UK ebay
http://www.ebay.co.uk/

[m tr4nch]

or a new oem s13 one 25370-35F00, $34.05 msrp. then again it's probably the same thing as the headlight motor switch basically, just with a different symbol on it.

good idea man, looks real clean. i'd save that wiring for future needs also. i might try and do a wiring clean up/tuck when it's time for it to go back in the car, or maybe just keep it on the list as a future project.

I'm super anal about things so probqbly have way too many man hours in it.

hey me too! lol

[Hijacker]

Thanks for the p/n matt. I'm gonna call up my parts guy tomorrow and get that on order.

I keep all of my extra wire, you never know when you need 12 feet of color coded wire and a series of relays. I do quite a bit of custom wiring, so i can always use more wires and plugs. My next project will be cleaning up my efi harness. I run a modded ka harness to run my sr, but i was lazy in doing some things, so i think i'm gonna fix that. Plus i can yank the atcu connections now. I would love to go through the interior harness, but i don't feel like stripping the interior out...yet

[hbpignosePA]

looks clean yo.... i would make one suggestion and get rid of the smaller relay box you have 3 in..... if you find a s12 (200sx) they came with no boxes but rather a panel for 6 relays to be mounted to. you could then mount the bracket up into the fender area (i plan to mount mine where the stock air box would be, far back to keep it outta the way)

i never liked how the s13's fuse box just sits there....


and i wish i found cool fogs, i have the wiring for it since i have an SE, but id want OEM ones

[angelscrx]

Wiring is my weakness so to see this is very impressive.