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02-17-2008, 12:25 AM | #1 |
Scooby Specialist
Member#: 28747
Join Date: Nov 2002
Chapter/Region:
VIC
Vehicle:06 WRX |
Building Relay Harness for highbeams ('06 wrx)
I currently have a '06 wrx with plans to install a set of driving lights using the factory high beam circuit as a trigger. So with no intentions of cutting the factory wires, I bought a few male/female 9005 connectors to build myself a short "pigtail" that I can splice without worry.
This then got me thinking, would it be worth while to build a relay harness for the high beams in the car? I know subaru's are ground switched so i'm unsure how a relay harness would help (since the 12V provided would be comming straight from the battery and the relay would only be switching the ground circuit). Furthermore, how would one go about wiring a relay harness for a ground switched setup? I know how to do it for positive switch but am lost when it comes to ground switched. *as a side note, I currently have HIR bulbs in the high beams and they are great, bright and even wide spread of light... I have a set of FF75's + 65W bulbs that are ready to be installed*.
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02-17-2008, 09:51 PM | #2 |
Scooby Specialist
Member#: 28747
Join Date: Nov 2002
Chapter/Region:
VIC
Vehicle:06 WRX |
lol... can anyone point me to a wiring diagram for this setup?
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02-18-2008, 01:03 AM | #3 |
*** Banned ***
Member#: 121004
Join Date: Jul 2006
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Daniel Stern Lighting has a wiring diagram with explanations on how to do a ground switched scheme.
Basically, instead of grounding the relay you use the factory positive and negative wires from the headlamp connector. Hope that helps. |
02-18-2008, 01:38 AM | #4 | |
Scooby Newbie
Member#: 116017
Join Date: May 2006
Location: NorCal
Vehicle:2006 WRX Wagon CGM |
Quote:
For an older vehicle that has a straight connection between the battery, switch and lights, I can see how a relay setup helps. Just curious, that's all. |
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02-18-2008, 02:13 AM | #5 |
Scooby Specialist
Member#: 28747
Join Date: Nov 2002
Chapter/Region:
VIC
Vehicle:06 WRX |
I haven't checked the voltage at the bulb either, I just figured it was an chance to upgrade the factory wiring and ensure I get full voltage at the bulb's. I've heard people with buy-eyes reporting huge gains in output with a relay harness... hence why I wanted to try.
On the other hand, if there is no real gain, I am not going to bother. Under hood space is really tight in this car. |
02-18-2008, 02:23 AM | #6 | |
Scooby Specialist
Member#: 108557
Join Date: Feb 2006
Chapter/Region:
NWIC
Location: King County
Vehicle:2003 PSM WRXWgn STG2 05 OBM LEGACY SDN |
Quote:
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02-18-2008, 02:25 AM | #7 |
Scooby Specialist
Member#: 28747
Join Date: Nov 2002
Chapter/Region:
VIC
Vehicle:06 WRX |
yes there are a bunch of compaines that do sell a plug and play harness for bugeyes....... I belive rally lights has one. There was another company that has one too but I can't remember it off the top of my head.
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02-19-2008, 12:26 PM | #8 | |
*** Banned ***
Member#: 121004
Join Date: Jul 2006
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Quote:
It's not totally necessary to upgrade the wiring harness, because most of the voltage drop occurs on the ground side (subarus are ground switched Daniel Stern lighting has some valuable information on why switches cause voltage drops). I have heard of another mod where you directly ground the bulbs to avoid the voltage drop. However, I'm going to personally get a wiring harness from www.lightwerkz.net |
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03-02-2008, 07:12 PM | #9 |
Scooby Specialist
Member#: 139076
Join Date: Jan 2007
Chapter/Region:
MAIC
Location: Scranton PA
Vehicle:2002 stg2 wagon 03 suzuki sv650s |
i believe you would put the switched ground from the oem connector to pin 85 and the common power from the connector to pin 86.
I am pretty sure thats how you do it im working on 2 wiring harnesses now, one for my bi xenon projector retrofit, and one for my driving lamps. |
03-02-2008, 08:11 PM | #10 |
Former Vendor
Member#: 125432
Join Date: Sep 2006
Chapter/Region:
Tri-State
Location: Clifton NJ
Vehicle:2004 E46 M3 http://lightwerkz.net |
Just wanted to chime in and let everyone know we offer fully custom wiring harnesses for all applications. Just pm/email us and we can give you a quote.
Thanks |
03-02-2008, 09:13 PM | #11 |
Former Vendor
Member#: 140712
Join Date: Feb 2007
Chapter/Region:
SCIC
Location: San Diego, CA
Vehicle:2008 WRX STI White |
if i remember right, with the stock wiring there is a 1.2v drop at the headlights. so making a harness will get you full voltage to the headlights, so they will be much brighter.
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