I have a 1999 GMC jimmy that i put an HID headlight convertion kit on. I did not like it so i took it off after about 5 min. When i put the halogen bulbs back in the driver side highbeam would not work. I changed the bulb checked all the fuses and even changed the DRL relay under the hood and it still wont work. The plug has no power so i checked the wires in the harness about a foot from the plug and still have no power. The passanger side works but the driver side does not. the ground is good the fuses are good and the switch is good but the light wont work

 

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Here is the diagnostic chart on your issue:

And here is the wiring schematic:

 

Thanks for the schematic this should help