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1998 Buick Regal - No high beams

The high beam don’t work. Fuses and bulbs are OK.

I’d suspect the switch itself on a car this old.

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Use your 12V test light to check for power at the high beam connector(s)

I’m guessing you won’t find 12V there . . .

Are the connections good . . . or melted?

I’m mentioning this because we have tons of GM vehicles in our fleet, and melted headlight connectors are EXTREMELY common

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I have seen a number of crispy connectors also in GM trucks, never had any Regals in the fleet, but certainly a consideration.