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Most likely the Headlight relay, located (electrically) after the dash switch and before the underhood relay (which is just for switching HI/LO beams and flashing HI beams from the stalk switch).
I'm not sure of the physical location on the '93. The Bentley shows it behind the center dash vents (it's #124 in wiring diagram). But I know on the '86 it lives beneath the floor hump next to the driver's left foot.
Maybe some others will tell you where to find it. It's a Bosch "cube" relay with 2 output terminals, 1 for the headlights and 1 for the parking lights.
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Bruce Young '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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