2000 Mercury Sable headlights

this is normally a sign that there is a bulb that is not working properly. test ALL bulbs, not just the headlight bulbs.

what if everything checks out then what, cause everthing else works perfect.

if your certain everything was good then must be wiring issue somewhere, either at dimmer switch or at one of the light assemblies.

It could also be a ground problem with one of the wires that connects back to the cars subframe. I am working on this same issue with a 2002 Ford Taurus right now.

ok i light tested the plug where the bulb plugs in and every prong is hot dont know if thats normal but they are hot,and i know the bulb is good i checked it in another car and its good any ideas thanks for all the info sofar

man if you get yours figured out please let me know what it was and ill do the same thanks for the info.