A website touting the Sylvania SilverStar headlight bulb says it provides ... in our labs and at our test track. We tested the low-beam performance of single-filament (9003) and dual-filament ...

The problem revolves around the headlight control module, which has been found in certain instances to switch off the low-beam headlights when the high beams are turned on. Needless to say ...

i.e. the area of the lens directly over the low-beam bulb. Mark this spot on the headlight by making a small dot with a ...