See if the bulb holders have gone brittle with the heat from the lights , if they feel really hard and crack then i would suggest the issue may be with the bulb terminals touching the holders terminals so new bulb holders would be required , other than that as you ran a seperate earth and got power to bulb it may be a loose connection , lighting relay , engine compartment fuse box has list on the cover for relays and fuses ,may be the wiring from the lighting switch, sorry plenty of options that it could be , have you had any work done to the vehicle of any sort before this problem occurred ? if so worth checking that all is back as should be , hope this is of some help
SOURCE: low beams
hello i no you said you checked your fuse box go under your hood drivers side near your strut tower their problay is a second fuse box its black some times fuses is on the cover you have to unlock the side of cover lift off on inside of cover will list what is what sometimes left and right headlamps are seperate fuses goodluck
SOURCE: 2000 GMC JImmy headlights quit working
Check for 40 amp fuse in vehicle but most likely under hood.
SOURCE: My low beam headlights stop working. all fuses are
The headlight circuit is a switched ground, with constant power. You should have three terminals. One power and two grounds. By grounding one or the other of the non-powered wires you are bypassing the switch. One ground is high beam the other is low. If one head light is acting up the problem is the harness along the bumper bar between the lights, easy to get at. If both sides are affected not so easy and many other possible reasons. The for-mentioned green monster under the battery/washer jug, the switch or the relay.
SOURCE: Low Beam Drivers Side doesn't work ... low voltage,
Power for the headlights on the Left side (High and low beam.) comes from the same fuse... The ORANGE wire and the ORANGE/BLACK are the same, they connect in the harness. If you only lack the 12v to make the light work connect them at the headlight assembly.
If your low beam also lacks ground the Left low beam ground is shared with the right low beam ground... Run a wire from left low beam DARK BLUE to right low beam DARK BLUE/WHITE.
If its not working now then your cursed, seek a witch doctor.
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