The components involved in your headlamp system vary considerably depending on whether your vehicle is equipped with "Auto Lamps", "Daytime Running Lamps" and/or "Fog Lamps". In any of these cases, both the High Beam and the Low Beam elements share the same grounds. Yes, it could be the dimmer switch. It could also be the Daytime running lamp module or the Headlamp Switch or the Auto Lamp Control Unit. It is also possible that you simply have both of your Low Beam Headlamp elements burned out or have bad sockets where they connect to the wiring harness.
Sound like dimmer switch.
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