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Old 02-03-2010, 06:07 AM   #1
pumpkyn
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Member#: 156347
Join Date: Aug 2007
Location: LA/PHX/SLC
Vehicle:
1997 Milano EK
2004 Platinum Wrex

Default sti headlights into 04 wrx

Ive searched and everyone is saying to grab the plug and play adapter, but I don't want the adapter unless its absolutely needed. I read in a thread that this is how to wire them without the adapter:

Quote:
I installed the STi HID headlights into my 2004 WRX a few weeks back. The installation is very easy. Sorry, but I did not take pictures of the install. It is very straight-forward. I assume that you know how to remove & replace the headlights, so I won't go into that. I also assume that you know how to use a soldering gun/heat shrink tubing, etc.

The standard disclaimer applies - This is what I did on my car. You should verify everything before performing this modification. I am not responsible for any damage or problems associated with this modification. Consult the service manual wiring diagrams WI-135 and WI-138.

By the way, the 2004 STi headlights are different from the standard WRX lights. The reflectors and bulb shields are different. I had a Catz HID kit on my car before switching to the STi lights. The Catz HIDs put out more light, but the beam pattern was not very good. The STi lights have an excellent beam pattern.

Here's what I did:

1) Disable the DRLs by disconnecting the DRL module behind the glove box. This is important.

2)On each headlight, there is a short pigtail lead that goes from the ballast to a black 2-prong plug. Remove these black plugs. You will then have one red and one black wire coming out of each ballast. The red are your positive leads and the black are the negative (ground) leads.

3) Solder a 18"-24" length of black wire onto each of the the existing black wires an put a ring terminal on the end of each.

4) LEFT HEADLIGHT (driver's side): Cut off the existing grey plug that plugged into your low beams and remove a few inches of the black protective tubing. You will have a yellow/red wire and a red/blue wire. Cap off the yellow/red wire - you will not be using it. Ensure that the red/blue wire is positive and is energized when the headlight switch is in the on position. Solder the red/blue wire to the red wire coming out of the ballast. Use heat shrink to weatherproof the connection. Take the black wire with the ring terminal on the end and attach it to the ground point next to the battery.

4) RIGHT HEADLIGHT (passenger's side): Cut off the existing grey plug that plugged into your low beams and remove a few inches of the black protective tubing. You will have a yellow/red wire and a blue/white wire. Cap off the yellow/red wire - you will not be using it. Ensure that the blue/white wire is positive and is energized when the headlight switch is in the on position. Solder the blue/white wire to the red wire coming out of the ballast. Use heat shrink to weatherproof the connection. Take the black wire with the ring terminal on the end and attach it to the ground point next to the air box.

5) Plug in the high beams and clearance/signal lights on both sides.

6) Properly aim the lights.

7) Enjoy your HID lights.

I hope this helps. Let me know if you have any questions
my question is will I run into any problems wiring it this way? IE blown fuses, etc, etc...

I know people don't like cutting up existing wiring harnesses but I don't mind it.
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Old 02-03-2010, 06:48 PM   #2
FourOnTheFloor65
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Location: Fairmont WV
Vehicle:
02 WRX STied PSM
03 L, 05 GT Legacy Wagons

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You will run into the same problems people have when running HID kits with no relay harness. During start up HIDs use significantly more current than halogens. Your headlight wiring is not designed for this. It usually won’t blow fuses because the high current draw is so quick. Overtime it will destroy your factory wiring and switches. Factory wiring is not easy to fix and OEM switches are not cheap. You need to run relays. You can still wire it up yourself without buying a harness. It however is not that much cheaper than buying a harness and will involve soldering and a good bit of time.

Get two good 30amp relays, a fuse holder rated for about 30amps, a 20amp fuse, and some 12 gauge wire. Do all of this for both sides. This way each side has its own relay. I always solder terminals on the wires to plug them into the relays. It is probably ok if you just crimp them but I don't like to do that. Regardless if you use terminals cut the plastic cover off of them and put some heat shrink over them. Or you can buy pigtail plugs for the relays, and solder wires to the ends of the leads. You need to solder and heat shrink all your wire to wire connections. It is wet under the hood of the car, not the place for crimp splice connectors. Things corrode easily. If you don't want to or can't solder just buy a plug and play relay harness. You already made the intelligent choice to do HIDs the right way, there is no reason to skimp on the wiring.

Anyways wire it up like this. Connect the positive wire from your factory headlight harness to terminal #86. Run another ground wire to terminal #85 and ground it where you grounded the ballast's black wire Run a wire to the battery with a fuse holder installed, use a 20 amp fuse, and wire it into terminal #30. Branch the battery wire after the fuse and run a lead to the other side to power that light. Finally hook the red wire from the ballast to terminal #87.
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Old 02-04-2010, 06:29 PM   #3
pumpkyn
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Member#: 156347
Join Date: Aug 2007
Location: LA/PHX/SLC
Vehicle:
1997 Milano EK
2004 Platinum Wrex

Default

thanks for the informational post! i got the headlights now it just need to figure out how to transfer the reflectors into my wrx headlights.
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Old 02-05-2010, 08:31 PM   #4
pumpkyn
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Member#: 156347
Join Date: Aug 2007
Location: LA/PHX/SLC
Vehicle:
1997 Milano EK
2004 Platinum Wrex

Default

got everything done, wired up, and they look great
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