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gomi_otaku, Technician
Category: Car
Satisfied Customers: 3457
Experience:  VW Technician, VW FastTrack, VW Academy, VW Certified
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2007 is250 How can I determine if my headlights have a bad

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2007 is250 How can I determine if my headlights have a bad ballast vs bad hid bulbs?
intermittent on off

You can swap the bulbs from one side to the other, or you can just replace the bulb (expensive yes, but eventually you will use it even if it is not due now) Typically a bulb will start to change color slightly, becoming more reddish or pinkish, before it fails.

Customer: replied 1 year ago.
I swap bulbs still problem

On some headlight assemblies you can also swap just the ballast assembly across to test.

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