My 2004 lincoln navigator low beam hid headlight will not come on. I replaced the HID bulb and replaced the fuses and it still will not come on

Look at the existing bulbs.

HID bulbs are a a different shape and have a high voltage ballast because the are a high voltage arc lamp.

https://www.amazon.com/XtremeVision-2003-2004-Lincoln-Navigator-Replacement/dp/B01DQ1TYHY

As opposed to a standard halogen bulb that has a filament.

https://www.autozone.com/collision-body-parts-and-hardware/headlight/lincoln/navigator/2004

The light from HID is much brighter and often brilliant white or blue-white.

Check for voltage at the plug where it connects to lamp, if there's 12vdc, you probably have a bad connector plug. If no voltage present, trace back to fuse box. Switch similar relays around

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Check the HID ballast. Make sure the ballast is not blown.

If you have the HID bulbs check with an Autoparts store like Autozone. I believe the right and left headlights have separate Relays in the Powerbox. It is possible that there are 2 low beam and 2 high beam relays total. They pull too much power for both sides to be wired together and may wire the high beams separate too!

1. Remove the three pin-type retainers, two screws and the radiator defector.
2. Remove the 4 bolts securing the headlamp assembly and remove headlamp assembly.
- Disconnect electrical connector
3. Remove the 3 hex-head bolts and 2 torx-head screws and remove headlamp protective cover.
4. *****Standard low-beam bulb*****
Disconnect the connector from the bulb and remove the low beam bulb.
5. *****HID low beam bulb*****
Release the spring tabs and remove the HID low beam bulb
Disconnect the connector from the bulb
6. *****High beam bulb*****
Disconnect the electrical connector and remove the high beam bulb.
Reverse order to install

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it is your hid ballast located under the headlight itself you can get one on ebay under a hundred bucks

Sounds like the ballast similiar to the ones in flourescent lighting may have gone bad and that is why the bulb is not lighting up.

Your low beam is a HID bulb, number D2R, and your high beam is a halogen 9005 bulb

your owner manual will list the bulb. It is expensive. tascafordparts.com for discount from Ford Dealer

here's 2003, don't have 2004

Navigator high intensity discharge (HID) headlamp

1. Remove the front radiator air deflector.

1. Remove the three bolts and the headlamp assembly.
• Disconnect the electrical connectors.

8. Remove the headlamp bulb protective cover(s).

• Remove the HID lamp cover.
• Remove the high beam cover.
• Disconnect the electrical connector and push the grommet into the headlamp assembly.

1. Release the spring tabs and remove the HID low beam bulb.