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2007 DTS, 2010 CTS
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21 Posts
Discussion Starter #1
My driver side headlight bulb finally went out on me so I replaced it earlier myself, read a couple of topics on here and saw a link to a video which was very helpful. Did not touch the bulb at all and have had experience with those kind of bulbs in the past. If you done this before than you know it's a pain to remove the assembly and all but before putting everything back together I checked the light and made sure it worked.. all was fine... left my lights on for a while and all worked perfect... After a couple of minutes I started to drive & on my way to home the light goes off... tried turning my lights off and on which had worked before & nothing... I went with the auto zone Sylvania brand bulb so not sure what happened.. anybody run into this issue before??. Any help is appreciated... not fun removing the headlight assembly...
 

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2006 dts 4.6
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54 Posts
I havent had that problem before but i do know that those oem bulbs barely go out. if you do take the bulbs out again try the new and old bulb in the other headlight to eliminate the bulbs. If they work then its probably the ballast....does your headlight have moisture build up in the headlight?
 

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2007 DTS, 2010 CTS
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21 Posts
Discussion Starter #3
Yes it does & after messing with it all day today I came to realize it is the ballast which is shot, had water inside of it. I have no idea how water got inside my headlight either, this is a first for me. After reading some posts on here I read that someone else had same issue and dryed out their ballad and after that it worked but not mine. Doesn't help that today has been non stop raining. I have ordered a new ballast but now my concern is where did the water come from and how did it get inside my headlight..
 

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06 DTS Performance
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273 Posts
If you get a blower to blow all the water out of the ballast and let it sit for awhile it should be good. Same thing has happened to me twice. I just took the headlight gasket off and used clear silicone and now no water is getting in.
 

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2007 DTS, 2010 CTS
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21 Posts
Discussion Starter #5
I thought about using silicone but just got frustrated with everything and didn't do it. When I had the ballast open I did dry with a blower and all the wiring itself as far as the harness because it was full of water but I'll be honest after I felt no more water I plugged it all back in so I will attempt it again but this time I will blow dry and let sit for a couple of hours. I ordered a new one anyways but guess it doesn't hurt to have it handy. Doesn't help either that it rains every week here in the Dallas, TX area... it has been this way for months now. Damn moisture....
 

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06 DTS Performance
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273 Posts
I live in Dallas as well. When we had all that ice and rain it messed my headlight up. Water somehow gets in the headlight and in to the ballast through the connectors. Without sealing up the headlight yourself you will continue to have the same problem.
 

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2007 DTS, 2010 CTS
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21 Posts
Discussion Starter #7
I removed the ballast since we have been having dry weather and have let it dry for over a day... tried it yesterday and nothing.. so I am guessing it is shot for real... I ordered the new ballast but turns out they where out of stock so now have to locate it somewhere else and wait for it to get in and start all over again.. after I install it and make sure all works well I will defenititly silicone the hell out of everything.. this has really turned into a nightmare job -__-
 

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2007 DTS, 2010 CTS
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21 Posts
Discussion Starter #8
Guess everyone forgets to mention but for anyone else reading this and run into this problem, whenever removing your headlight asembly make sure to check the ruber gasket around it and any place that you may think water can get in through and seal it off with silicone or whatever you chose to use to weather proof the headlight and then re install it.
 

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2011 DTS Platinum
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4,633 Posts
I removed the ballast since we have been having dry weather and have let it dry for over a day... tried it yesterday and nothing.. so I am guessing it is shot for real... I ordered the new ballast but turns out they where out of stock so now have to locate it somewhere else and wait for it to get in and start all over again.. after I install it and make sure all works well I will defenititly silicone the hell out of everything.. this has really turned into a nightmare job -__-
Amazon has a lot of parts.. put the part number in the search box and see if they have it..
Free 2 day shipping with Prime and about 4 bucks for one day shipping..
PS... Noticed you are in Dallas...I am in Ft Worth
 

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2007 DTS, 2010 CTS
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21 Posts
Discussion Starter #10
Thanks for the info. I actually ordered it off of eBay. Came with a 60 day warranty so I felt pretty good about that one. Gave me free shipping as well and should be here by Friday or Saturday. & good to know that there are people on this forum that are close by. Never know when someone might need a hand. :+1:
 

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2007 DTS, 2010 CTS
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21 Posts
Discussion Starter #12
Finally got everything working properly... Got my ballast in and sure enough did the trick.. went ahead & sealed all around the headlight with 100% Silicone and even siliconed the hell out of the two plug harness that go into the ballast so that water may never get in there again... let everything dry all evening and even overnight & installed it all back first thing in the morning... Went to the car wash to test out the light for water going inside and nothing at all anymore :+1:.. Thanks for all the help & hopefully this post helps out someone else who runs into this problem.
 

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2006 DTS
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1 Posts
Having same issue with passenger headlight. Replaced the bulb and then realized is was ballast. Now getting moisture build up which is causing light to go on and off. Will pull again and per comments seal. Anyone know where we might be able to get a replacement for the bulb cover. (The black out cover) Ours has two of the holes broken and this maybe where water is getting in. Or can the broken holes simply be sealed?
 
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