May 18 2008
B6 Audi A4 1.8T Quattro 35W HID Headlight Conversion
I recently installed a 35W 4300K HID conversion kit on my B6 A4 1.8T Quattro with stock projection H7s. The new HIDs look excellent and well resemble other OEM Audi HIDs. The installation was straightforward. I completed it in an hour on my lunch break and experienced no ‘bulb out’ warning once everything was installed.There are however a few difficulties you may encounter and they are as follows: -Finding all the Torx screws that hold on the headlights: There are four screws for each headlight and there is little room to loosen the lower two. On North American spec B6s (02-05) you do not have to fully remove the two lower screws, just loosen them and the headlights can slide out (the lower holes are slotted). This way you won’t drop a screw. Also, this can all be done without removing anything else… like the intake for example. -Removing the main wire harness plug that connects to the headlight casing: This is done by pushing down on it slightly, inserting a screwdriver into the slot on the side and turning, then pulling the plug out with the screwdriver still turned. The plug should come out fairly easily once you had turned the screwdriver, so if it doesn’t, you probably haven’t turned it far enough. You could do this install without completely removing the headlights (leaving them plugged in) … but it’s nice to take them out and get a good look at them… and much easier on the hands. -Drilling the hole in the lamp cover. In another H7 installation guide, I read to drill a 1″ diameter hole. However, the plugs you need to pass through the hole and just under 1 1/8″ across and will not fit through a 1″ hole. So use a 1 1/8″ hole saw to drill the hole and all will be well. -Wiring: Dark to dark, light to light works great… though I don’t think it matters in an H7 anyway. The two flat slotted male connectors go into the the female plug that pulls off the old H7 bulb. This all happens on the inside of the lamp cover. You need all the wires provided, so don’t cut anything. -Reinstalling the headlights: I mounted the ballasts in the convenient little recess under each headlight, however this ended up causing some problems. If the ballasts are mounted in this way, the wiring has to travel out from under the headlight and up to the lamp cover. This causes spacing problems when sliding the headlights back in, as the wires interfere with the lower mounting brackets. I ended up just forcing them into place… but they definitely didn’t go in as smoothly as they came out. So maybe just rest the ballasts in the recess and try sliding the headlight in and out prior to taping them in, just to see if a similar problem is encountered. If so, simply mounting the ballasts in a different location would solve the problem. All fairly simple stuff, but hopefully it can save you some grief. Best of luck.
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Great discussion reviewing the installation. Thank you for posting!