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check the ground wire to that headlight .
Check your ground wire for that particular headlamp.
Black with Orange trace
Run a ground wire to that headlight. If it gets brighter, there is a problem with the ground in the wiring harness.
In Bangladesh the color of live is green and neutral is blue and ground is black.
The chasis is the ground. There is no wire.
Blinking lights on dash and exterior lights may indicate a bad ground wire or a faulty headlight switch. Both would cause those problems.
Usually the ground wire that comes out of the headlight that is fastened to the car body is the culprit. You will usually find the wire terminal from the headlight plug attaching to the car body or chassis ground not too far from the headlight. Fairly common problem.
The ground wire at the bulbs is black.
Sounds correct-- clean all connections and perhaps run a ground wire from headlight body directly to ground for test
black
behind the headlight there is a ring and what you do you loosen the ring and pull out the bulb and unplug it . if it is hard to unplug your plug is burnt. cut the wire and buy a new plug at autozone for $4.99. make sure you color code the wires center wire is ground and left and right is high and low.