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E85 / E86 Z4 (2003-2008)
E85 Z4 Roadster, E86 Z4 Coupe, E85 Z4 M Roadster, and E86 Z4 M Coupe talk with our BMW gurus here.

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Old 09-02-2014, 10:52 PM
billy0728 billy0728 is offline
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Location: Virginia Beach
Join Date: Sep 2014
Posts: 1
Mein Auto: BMW Z4 '05
2005 Z4 halogen headlights to HID conversion

Hi, I'm looking to swap out my factory halogen bulb with a HID upgrade. I did a search on the Z4 forum but can't find what I'm looking for. I think I have H7 halogen bulbs now, but not 100% sure, how do I verify this? Also, can anyone point me to a video tutorial on the swap? Thanks so much for your help in advance!
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Old 09-25-2014, 08:21 PM
SergeZee SergeZee is offline
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Join Date: Jun 2014
Posts: 8
Mein Auto:
Swap is fairly easy to accomplish .
You have H7 and H11 for fog.

You cannot replace your high beam to HID if running them as DRL as it uses the same bulb at 30% voltage .

I replaced my main and Fogs with 2 kits ( 2 bulbs / 2 ballasts ) each .
So a total of four .

I strongly suggest buying ballasts that are slim / waterproof . I had problems with non waterproof as you will be installing them in the area inside your front bumper ... Susceptible to water and moisture , and will get a light fault on dash .

Kits are available on EBay and Amazon . The 6000k color is the most pleasing and clear for night driving . 8000k is too bluish and doesn't look nice on a Beemer .

The bulb is a drop in replacement and twists in position .
It was 2 Leads that have to go the the high voltage ballast .
The low voltage side of the ballast needs to be connected to the original harness ( plug ) either by splicing it or finding a male / female connector .

I suggest taping the connection with electric tape to waterproof the connections ..

Mount the ballasts with double sided tape ( included ) to the inner wall of wheel well ..

It will take about 1 hr per side to do it properly .. Minus the arm cramps

Good luck .

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