whoa, who dug this one up:-) 26month old question. Anyhow, I would go with another bulb. Check the socket and make sure that you have proper ground. If it is not the bulb itself, take a look at the connector , as well as the barrel of the bulb, make sure that the ground is not corroded. Does happen frequently and can cause those symptoms. Looking at the wiring diagram, it is very unlikely that the headlight switch would cause this, since both headlights are on the same switch circuit.
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