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The Boss
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Joined: Nov 2013
Location: Orlando, FL
Posts: 351
Drives: S13.5 Nissan 240sx (Fastback)

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#1 - 12-28-2013, 10:20 PM.



Disclaimer: I am in no way responsible for you if something happens to you or your car after doing this modification. If you're not somewhat knowledgeable in wiring do not attempt this, find someone that knows what they are doing and learn from them. This is not a project for inexperienced individuals, period.

After following the wiring diagram from Yoshi's website... Yoshi's S13-S15 Conversion

I noticed that when I would switch on my high beams my low beams would cut off. Doing some more research I realized that this is not how the S15 headlights are suppose to function as the low and high beams should be on when the high beams are on. This is because the way the S13's sealed headlight functions.

So if you want a quick little fix on how to have your highs and lows on when the high's are triggered read ahead...

Things you'll need:

2 Bosch Relays
8 gauge wire
12 gauge wire
30A Fuse
Soldering iron / solder
Electrical Tape
Wire Cutters

Assuming you've already followed Yoshi's diagram to wire up your headlights, simply follow this diagram of how the relay's are wired up and everything will work properly. Shouldn't take too long to finish, I did it in an hour or so.

Diagram:

Image


Before:
[Yoshi's pic from his site] (notice the low beams are not on)
Image


After:
Image

Any questions feel free to ask.
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Last edited by KiLLeR2001 on 12-28-2013, 10:21 PM.
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Posts: 3
Drives: S13 vert, S13.5 Fastback, 01 Windstar SE Sport

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#2 - 01-17-2014, 1:46 AM.



I did mine differently. I used a wire that becomes hot from the pop up headlight motors when the lights are turned on for the low beams.

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The Boss
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Location: Orlando, FL
Posts: 351
Drives: S13.5 Nissan 240sx (Fastback)

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#3 - 01-17-2014, 1:56 AM.



I removed all the wiring for my pop-ups on my S13.5 so that's not an option for me anymore.

Do you know what size wire is used for the motors? I wanted to use a beefier wire so there wouldn't be any issues with getting adequate power to the headlights. Especially since I plan to upgrade to HIDs in the near future.
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Last edited by KiLLeR2001 on 01-17-2014, 2:06 AM.
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Joined: Jan 2014
Posts: 3
Drives: S13 vert, S13.5 Fastback, 01 Windstar SE Sport

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#4 - 01-17-2014, 2:25 AM.



I do not recall what exact gauge wire was used. It was the next step up from the thin wires that Nissan used through out the engine room and chassis harness.

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The Boss
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Joined: Nov 2013
Location: Orlando, FL
Posts: 351
Drives: S13.5 Nissan 240sx (Fastback)

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#5 - 01-17-2014, 2:28 AM.



Most likely 18 AWG. You should be alright, I'm pretty sure 18 AWG is rated up to 15A, which is what the stock fuse is for on the headlights. I would double check to make sure its on a 15A fused circuit if it is indeed 18 AWG.
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