depends. most normal halogen headlights that i've replaced have a dual filament in the bulb. one for high beam and one for low. I have an 01' and this is the case for mine. pop a bulb out and take a look at it. if a filament is bad it will be broken in the bulb.

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2001 Ford Ranger XLT, Super Cab, Flareside, 4x4, 4.0L, 4" Superlift Lift with Pro Comp MX-6 w/reservoir for the rear with Pro Comp MX-6 monotubes in the front, 3" Body Lift, 35x12.5x15 BFGoodrich Mud Terrains, flow master, 200 amp alternator with 0 gauge to the cab nom nom, K&N Intake, Tinted Windows, fog light mod, american racing seats, dynamated cab, back up camera, CB Radio w/external 15W speaker.