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Push the headlights switch in. The switch doubles as the cabin light switch and it easy to activate the cabin light when turning the headlights on or off
On a 1990 Buick you have a fuseable link between the headlight switch and the battery. Do you have power in and out of the headlight switch and the dimmer switch ?
First check the headlight relay by changing it with one of the same number in the fuse panel.If it checks out ok then you have a faulty headlight switch.
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