My right D1S is out and the ballast got wet, so I am assuming a ballast issue. I have ordered two new bulbs as neither has been replaced since 07, but do I need to also replace both ballasts to get equal light or does a ballast simply function or not. I don't understand the purpose of the ballast
2007 Escalade D1S Bulb Ballast replacement
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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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The ballasts either function or not.
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