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Old 10-03-2019, 09:45 PM   #1
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ST D3S Headlamp Issues

Drivers side headlight went out last week. Tried to replace using OSRAM 66340 and not getting it to work. Removed bulb is OSRAM 66340HBI. Both are D3S. I thought they were incompatible.

Is this a bulb issue or should I be troubleshooting other problems?


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Old 10-03-2019, 09:46 PM   #2
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Forgot to add 2015 Focus ST
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Old 10-04-2019, 11:36 AM   #3
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Those two bulbs are interchangeable. Could have an issue with ballast. Try swapping the driver and passenger bulbs to see if the known good bulb from the passenger side works on the driver side.
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Old 10-06-2019, 05:57 PM   #4
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Thanks 89lxvrt! Did the the test and it’s not the bulb. New OEM ballast seems hard to find under $100. Any recommendations on aftermarket ballast and install? Or is it better to just suck it up and buy the OEM part?
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Old 10-06-2019, 08:58 PM   #5
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When I did my D8S to D3S conversion I used these. You unscrew the balast piece in the middle and swap it over to your oem bracket.

https://rover.ebay.com/rover/0/0/0?m...2F252543325272

Sent from another garage.
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Old 10-06-2019, 10:45 PM   #6
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Quote:
Originally Posted by stillclan6 View Post
Thanks 89lxvrt! Did the the test and it’s not the bulb. New OEM ballast seems hard to find under $100. Any recommendations on aftermarket ballast and install? Or is it better to just suck it up and buy the OEM part?
You could also swap ballast side to side to prove that is the issue. If you want to be sure.

I bought used ballast when I changed to D3S in my 2013 ST3 headlights. The Osram ballast is not car manufacturer specific, mine actually came from a Tesla. Just search eBay for whatever numbers you can find on the ballast and match up the picture to what you have. I paid less than $100 for two bulbs, ballasts, and wires. You should be able to find a good deal on a single used, tested, and guaranteed.

Last edited by 89lxvert; 10-06-2019 at 10:49 PM.
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