When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Last night a was leaving a restaurant and the headlights decided not to come on... Let me first give you some info about the car:
2000 A4 Coupe
Depo aftermarket fixed headlights w/3000K HID kit (low beams only)
-aftermarket lights/HID have been on the car for 2-3 years
So although the headlights didn't come on, the gauge lights were all lit. When I switched to high beams, they came on without issue. I tried flicking the stalk manually to actuate the lights but, again, nothing...
My first guess was that a relay burnt out, but after doing some quick research on here I learned that there isn't one as such.... anyone have any ideas?!?! THANKS FOR YOUR HELP!!!
Unfortunately, no luck. The fuses checked out so I swapped out the breaker and still no lights. Does this mean there's a wiring issue somewhere? Please note, there has been no intermittent success with this issue, the lights have been out cold out since last night. I've never had any issues with them previously...
Another thing to check is that the installer may have installed a relay harness. HID conversion kit wiring relay harness' are for vehicles with poor battery, alternator, or heavy draw on power from stereo's or any low voltage issues. This wiring allows you to get power from the battery directly instead of the connector for the headlight bulb. If that has gone bad, that would be your problem. If you find one, you can take it out of the circuit and try the lights again, if they light, you will need a new relay. Here is a pic of what one looks like. It may be down under the light housing near one of the ballasts or more likely, near the engine fuse box as it has to hook up to the battery. See bottom diagram on how they hook up.
Short of that, the next thing I would look at are the ballasts that control the firing of the HID bulbs. What is odd is that if it is the ballasts, it would be both of them failing (each light has it's own).
Last edited by ChuckWalters; Aug 31, 2014 at 04:20 PM.
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Originally Posted by ChuckWalters
Jim,
Another thing to check is that the installer may have installed a relay harness. HID conversion kit wiring relay harness' are for vehicles with poor battery, alternator, or heavy draw on power from stereo's or any low voltage issues. This wiring allows you to get power from the battery directly instead of the connector for the headlight bulb. If that has gone bad, that would be your problem. If you find one, you can take it out of the circuit and try the lights again, if they light, you will need a new relay. Here is a pic of what one looks like. It may be down under the light housing near one of the ballasts or more likely, near the engine fuse box as it has to hook up to the battery. .......
Excellent advice. Aftermarket headlight units require their own wiring harnesses be installed on the vehicle, and there will always be a fuse, as well as a relay incorporated into it.
My low beams on my aftermarket HID lights also recently failed to turn on, and after doing some troubleshooting, I found the fuse was good but the relay was bad; a victim of some corrosion and roached contacts. They're not sealed, so over time, moisture can cause problems. For a replacement, I bought a better quality relay which also has higher current rated contacts (40 amp) as well. Simple plug-in and all's well.
Excellent advice. Aftermarket headlight units require their own wiring harnesses be installed on the vehicle, and there will always be a fuse, as well as a relay incorporated into it.
My low beams on my aftermarket HID lights also recently failed to turn on, and after doing some troubleshooting, I found the fuse was good but the relay was bad; a victim of some corrosion and roached contacts. They're not sealed, so over time, moisture can cause problems. For a replacement, I bought a better quality relay which also has higher current rated contacts (40 amp) as well. Simple plug-in and all's well.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.
HELP! Headlights won't come on!!
Excellent advice. Aftermarket headlight units require their own wiring harnesses be installed on the vehicle, and there will always be a fuse, as well as a relay incorporated into it. 
