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Old 10-19-2003, 11:40 PM   #1
silvertoy
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Default 9007 Wiring harness upgrade.

I want to make my own upgraded gauge wiring harness for my WRX. I have all the parts necessary, I just need to know if my wiring is correct. I have a schematic I drew up, but I'm not sure if it will post correctly, so I just included a link to it. Mostly I'm concerned with the negative wiring scheme that subaru has, and it's affect on the relay setup. I'm planning on using Bosch Type Relays (5th center pin ommited for simplicity) Thanks for any help or input.


Or....
Click the image to the right.
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Last edited by silvertoy; 10-20-2003 at 01:39 PM.
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Old 10-20-2003, 08:04 AM   #2
Orson
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The link says: "You do not appear to be the owner of this album"

A couple of us built harnesses for our Prodrive UK300 headlights. You may be able to find some of your answers here:
http://forums.nasioc.com/forums/show...uk300+prodrive


See here about uploading pics on NASIOC:
http://forums.nasioc.com/forums/show...hreadid=427944
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Old 10-20-2003, 09:41 AM   #3
Mulder
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As Orson said we can't see your pics so I can't comment directly on that. However the most important thing to consider with a wiring upgrade is eliminating the voltage drop on the ground side which is where most of the loss occurs. If your goal is to maximize the performance of the stock bulbs or aftermarket ones with the same wattage, a ground-side upgrade alone may be sufficient. If you want to go up in wattage then the positive side has to be addressed as well, and better connectors used at the bulbs so they don't melt.
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Old 10-20-2003, 01:44 PM   #4
silvertoy
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Fixed the links. I couldn't get the image upload link to work, I tried, but I need a password, which I don't have.

What I'm trying to do here is create a setup which will allow me to use 2 relays (one high beam and one low beam) that are controled by outputs from one of the stock headlight sockets, the two relays then control the high and low beam for each of my 9007 connectors (which I will get from Autozone) I do not want both high beams and low beams on at the same time, I just want to eliminate the possibility of ruining my stock harnesses due to using bulbs with higher wattages if I go that route, and just to decrease the voltage drop that is apparent currently. Sorry for the awkwardness and roughness of my diagram

First thing I understand from mulder's comment is that I should eliminate the connection of the gray (ground) wires between the factory socket and the new sockets, and just put the middle connectors from the 9007 plug to a common (heavy gauge) chassis ground... Is that a correct assumption?
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Old 10-20-2003, 02:08 PM   #5
silvertoy
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Whoa, after reading the thread w/in the thread orson posted, it seems I have the negative wiring thing all mixed up. In this case, The center pin is the positive and the side pins complete the circuit by providing a ground. So... It really doesn't matter to the bulb since it's DC. Am I catching on?

Take a look at my version 2 of the Wiring Harness...

Click on version 2 wrx headlight

Last edited by silvertoy; 10-20-2003 at 02:17 PM.
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Old 10-21-2003, 09:03 AM   #6
Orson
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Quote:
Originally posted by silvertoy
Whoa, after reading the thread w/in the thread orson posted, it seems I have the negative wiring thing all mixed up. In this case, The center pin is the positive and the side pins complete the circuit by providing a ground. So... It really doesn't matter to the bulb since it's DC. Am I catching on?

Take a look at my version 2 of the Wiring Harness...

Click on version 2 wrx headlight
Yeah, sounds right to me. It looks like you are converting the stock ground-switched circuit to a high-switched circuit. I don't see a problem with this, but you may want to ring mulder for his blessing - he's caught a few problems with my previous wiring endeavors!
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Old 10-21-2003, 10:01 AM   #7
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You need to make one change before this will work. As drawn now you have both sides of your relay coils going to grounds, so they aren't going to operate. The switched grounds are on 86 and chassis ground is on 85. What you need to do is move 85 to the common headlight positive (your "Vehicle +") and then the relays will work correctly.
Once you make that change you will have the relay coils connected to the stock wiring in place of the bulb filaments.
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Old 12-08-2003, 08:30 PM   #8
silvertoy
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Well shoot,
I got lazy and decided to order the Wiring Harness upgrade from SUVlights.com (it's the 4 relay version by the way, that uses 2 separate relays for each bulb) I ended up buying it because I couldn't find the 9007 male and female connectors anywhere.
I'm not complaining too much though, There is a drastic improvement now (I'm using hella 55/100 bulbs).
But........... there's one MAJOR issue that has reared it's head with this harness. My fog lights. When I am using low beams and I turn on my fog lights, the high beams come on (probably simultaneously with the low beams I can't tell, must be hot inside that bulb) and hence activate my auxiliary lighting which is triggered by the high beam activation, but what's more annoying is that it defeats the purpose of the fog lights if the high beams kick on and blind me from the glare. Any helpful suggestions?
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Old 12-09-2003, 09:51 AM   #9
ride5000
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i might be mistaken, but i _think_ you have to do the "fog light mod" found on scoobymods.com.

hth
ken
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Old 12-09-2003, 03:32 PM   #10
Orson
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I also have this problem with my home-made harness for my Prodrive lights and mulder has this problem with his Morette's (that have a built-in relay for the high-beams).

The problem is not consistent - sometimes, turning on the fog lights causes the high beams to come on, but sometimes it doesn't. In any case, there is nothing wrong with your harness. It does look like the best remedy is to go ahead and do the fog light mod on scoobymods.com
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Old 12-09-2003, 03:59 PM   #11
Captain Ned
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I've installed a relay kit from Daniel Stern. This is how I wired it, and it's worked perfectly for 2 years. No fog light/high beam issues at all.

Use the left headlight as source for low beam, right headlight as source for high.

1) Center wire from stock left headlight socket to 86 terminal on low beam relay.

2) Wire from 85 terminal on low relay to yellow/red wired terminal on stock left headlight socket.

3) Center wire from stock right headlight socket to 86 terminal on high beam relay.

4) Wire from 85 terminal on high relay to red wired terminal on stock right headlight socket.

5) Power supply wiring from alternator stud to 30 terminal on each relay.

6) Wire from 87 terminals on high beam relay to red wired terminal (equivalent, can't remember which side of plug it is now) on each of new headlight sockets.

7) Wire from 87 terminals on low beam relay to red/yellow wired terminal (see #6 above) on each new headlight socket.

8) Wire from center terminal on each new headlight socket to battery negative ground.

Enjoy much improved lighting.
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Old 12-30-2003, 02:49 PM   #12
silvertoy
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I've been away for a while so I didn't get a chance to look at this much, but from what I've seen of the foglight mod, I don't think it allows me to do what I want. I want it so that my fogs only come on with my lowbeams and MOST importantly that my highbeams don't come on when I have my low beams and fog lights on. I don't want my high beams coming on evertime I'm in a snow storm or heavy fog and want to use my fog lamps and Low beams. I'm not sure how the Fog Light Mod helps that, unless I'm missing where the connection to those relays is missed? Maybe I need to put a larger resistor in the relays I got from SUV lights. Sorry if I'm missing something obvious, but if someone feels like pointing out my ignorance, please, by all means.
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Old 12-30-2003, 11:11 PM   #13
Orson
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Some people like the flexibility of dictating when the fog lights come on, irrespective of whether the low-beam or high-beams are on. With the fog light mod, the fog lights always turn on when you depress the fog lamp switch. No dependency on anything other than ignition. Personally, I think most of this is for that rally look of having a bazillion lights on, but it does put you back in control of the fog lamps (even more so than before) and there are arguments for having only the fog lamps on (no low-beams or high-beams).
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Old 12-31-2003, 08:28 PM   #14
silvertoy
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Good point Orson on the "just the fogs" comment. I didn't realize it turns them on with the ignition as the relay trigger. So do these intructions look like good ones to follow?....

http://www.scoobymods.com/forums/sho...&threadid=1022

I hope that wasn't taboo to post that
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