Inspect the right headlight connector and housing for moisture and a loose or hanging wire. The dual-filament bulb should have three wires: low beam, high beam, and ground. With the low beam on, only the low-beam wire should be hot; if power is present, recheck the ground. Trace the missing or dead low-beam feed if neither of the two wires found is hot.
A 2001 Jeep Grand Cherokee has a right low beam that does not work, while the right high beam and both left beams work. Fuses, the bulb, and visible wiring were already checked. The expert advised testing for power at the bulb and rechecking the ground, noting that a dual-filament bulb needs three wires. The owner found only two wires and no power on either, so the expert suggested checking for moisture and a hanging or missing wire.
