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Old 11-14-2009, 04:42 PM   #1
relliMmoT
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6MT JBP 318WHP//300WTQ

Default HOW-TO: Parking light switch rewired as auxillary/secondary fog light switch

HOW-TO: USING THE SWITCH ATOP YOUR STEERING WHEEL FOR A RELAYED AUXILIARY LOAD SUCH AS RALLY/FOG/DRIVING LIGHTS OR ANYTHING YOU CAN DREAM OF

I installed some Hella 500s in my grille and always like to retain as much factory look as possible (I know, 6" driving lights in the grille doesnt speak highly to that ) so I want to turn them on with the switch atop the steering column.

I would like to use the parking light switch atop the steering column rewired for consant power source as a switch for the driving lights.
I KNOW this switch cannot carry the current, I am running through the relay box for the higher current lights.
I will probably also need to know how to bypass this switch's use as an OEM feature if some rewiring is required there as well.

I took apart my steering column and tested the wires. On the left of the column you can find green white and red wires coming from the switch to a wire harness on the underside. On the other side of that connector you will find:
#2: ORANGE wire (which will now be referred to as #2) that is your PARKING LAMPS SIGNAL
#1: BLACK w/ RED wire (now referred to as #1) is your IGNITION +12V SIGNAL
#3: WHITE w/ RED wire (now referred to as #3) is your CONSTANT +12V SIGNAL

-CUT #2 & #3, splice them together. This splicing. bypasses the OEM function of the switch and makes it so your parking lights function as normal without the capability of switching them on with the car off. Leave some slack off where you cut from the connector for the #2 (orange) because youll need to splice into this wire also.
-SPLICE your relay signal wire into the orange wire. This orange wire off the harness splices into a new wire that you will have to install and run to your relay!

Again, this setup allows you to use the parking lamp switch atop the steering column as a constant 12V switch with OEM look and feel. DO NOT RUN THE WIRE STRAIGHT TO YOUR AUXILIARY LOAD (ex. fog lights) AS THIS IS A FIRE HAZARD. YOU MUST GO THROUGH A RELAY AS THE OEM SWITCH CANNOT HANDLE THE CURRENT. I used a 30A Advance Auto Parts relay and a 10A fuse. If you cant correctly wire a relay you shouldnt do this mod yourself.
TO CALCULATE FUSE SIZE:
Divide the wattage of your load by 12(Volts), thats Watts/Volts=Amperage. (Two Hella 500's @ 55w each = 110w divided by 12V is 9.16A, I used a 10A fuse) Your fuse will be slightly higher than that amperage. The point of the fuse: burn up the fuse if the heat in the wires gets hot enough to raise the current required for the load to an extent beyond allowable for fire safety. DONT ASSUME THE RELAY THE SECOND ROLE OF FUSE.


Illustration of the type of switch the OEM switch is:

Where the top wire will be 1, middle 2, and lower 3.
1 is IGN +12V
2 is parking lamp signal
3 is contstant +12V

What I was setting up for:
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Last edited by relliMmoT; 11-17-2009 at 06:00 PM.
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Old 11-14-2009, 07:18 PM   #2
SubLGT
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I did something similar on my Legacy, but made the parking switch a DRL switch. Get yourself a copy of the wiring schematic for your vehicle, and this mod will be straightforward.
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Old 11-14-2009, 11:42 PM   #3
route69wrx
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2002 MBP bugeye

Question

if you do that, how will you accidentally turn your parking lights on...

why dont you just by a second oem fog light switch and put it in the dash next to the other one...

Last edited by route69wrx; 11-17-2009 at 12:54 PM.
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Old 11-15-2009, 06:53 PM   #4
relliMmoT
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6MT JBP 318WHP//300WTQ

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removed

Last edited by relliMmoT; 11-17-2009 at 05:59 PM. Reason: info added to first post
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Old 11-15-2009, 06:54 PM   #5
relliMmoT
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2004 WRX Wagon
6MT JBP 318WHP//300WTQ

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no i dont want another OEM switch for $25 when ive got a nice convenient one atop my steering wheel for free!
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Old 11-15-2009, 07:04 PM   #6
paperdukie
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Hmmm I really like this idea. Definitely keep the thread updated cause I'd like to do the same thing eventually.
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Old 11-17-2009, 06:40 PM   #7
relliMmoT
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6MT JBP 318WHP//300WTQ

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question thread has been converted to mod thread
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