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Mustang Headlight Installation & Comparison (99-04 New Edge)

Posted 11/5/2013 by Jeff Jimenez

FOLLOW: mustang , 94 04 mustang , sn95 , video , installation , tech , exterior , lighting , headlights , new edge mustang

1999 - 2004 Mustangs are notorious for having fading and cloudy headlights. Sometimes I think headlight cleaning kits were invented just for these Mustangs. The headlight cleaning kits only work so many times before it is time to replace the worn out stock headlights with a new set. The good thing is replacement 99-04 Mustangs headlights are inexpensive and very easy to install. There are quite a few choices for replacement and aftermarket headlights for this year model Mustang. To help ease your decision process, we set out to install a couple different versions of the headlights for you to see on a "new edge" SN95 Mustang.

Jonathan from our Research Department was nice enough to donate his 2003 SVT Cobra for our install and comparison. Jonathan just recently picked up this nice looking Cobra and it was in need of a little TLC. The aftermarket headlights that came on the car when he bought it were fading and the clear coat was peeling off. Check out the pictures at the bottom that compare the differences in the the following headlight kits:


  1. Open hood.
  2. Locate retaining clips and pull up to remove. (see picture below)
  3. Gently pull headlight away from header panel. Be careful not to pull too hard and break the headlight and side marker bulb connections.
  4. Disconnect the headlight and side marker bulbs connections from wiring harness. (see picture below)
  5. If required, remove bulbs from old stock headlights and move them to the new headlights.
  6. Reverse steps above to re-install headlights and enjoy!
Mustang Headlight Installation & Comparison (99-04 New Edge) - mustang headlight installation new edge
Mustang Headlight Installation & Comparison (99-04 New Edge) - mustang headlight comparison
Mustang Headlight Installation & Comparison (99-04 New Edge) - mustang headlight comparison

About the Video

99-04 Mustang Headlight Install

Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!

Published on 2013-01-03
Product: 99-04 Mustang Headlight Install
Fits: Mustang V6, GT, Cobra, Bullitt & Mach 1
Year Models: 1999 (99) - 2000 (00) - 2001 (01) - 2002 (02) - 2003 (03) - 2004 (04)

Kit includes both left and right hand Mustang headlights. Replacement headlights with internal amber park lamp. Nice upgrade from the clear style lights on 1999-2000 Mustang models.

Dingy headlights are the worst!
How many 01-04 Mustangs have you seen driving around with dingy, yellow headlights? When the 99 Mustang debuted most were glad to see the updated front end and headlight combination, unfortunately it seems like we stepped back in time because 99-04 Mustang headlights seem to get just as dull and dingy as the old Fox body headlights did. It's amazing how something as insignificant as a dull headlight can ruin your Mustang's overall appeal.

1 Year Warranty on These Headlights!
Although the manufacturer does not always warranty their products, we do! If you consider buying replacement headlights from Late Model Restoration Supply you can be assured that we will stand behind them! We only use the best possible manufacturers when selecting our products. We have heard of other companies telling their customers to bake their lights in an oven or run silicone around the seams to fix or prevent leak issues. Not here! If for some reason you have an issue with these lights leaking or turning yellow, we will replace them. No questions asked, within 1 year of the purchase date!

If you own a 1999 to 2004 Mustang, then you already know that the headlights are notorious for doing this-- completely fogging over, not letting light pass through, and looking like garbage. Luckily, we have lots of different options to get you back right, two of which are the Ford original '01 to '04 style Mustang headlight. The other one is our aftermarket version of the same light.

What's the difference between the two? Not a whole lot. They look almost identical and fit almost identical, unlike other companies' offerings. Now, the '01 to '04 style has the black inserts, giving it a smoked look. The '99, 2000 is completely chrome on the inside, giving it a much brighter look. This '01 to '04 style is the more desirable and most popular option.

Now, on our aftermarket lights, they have the factory adjusting points and the factory mounting points. Both the Ford original and the aftermarket don't come with new bulbs or side marker sockets. You'll have to reuse your originals. Or if your originals are bad, we have you covered with new bulbs, new side marker sockets, and even pigtail connectors for boats, in case your pigtail connectors are broken.

Let me show you how these things fit in comparison, Ford versus aftermarket. Now to, get your janky old headlight out of the way, you've only got two pins in your way. Grab hold, and pull straight up, and those pins will let free. And you can grab hold of the headlight, wiggle it forward, unplug your headlight bulb, and then unplug your side marker.

Now, this old headlight, not looking real great. Now, I want to show you the fit difference between the Ford original and the aftermarket. This is the Ford original unit. Make sure everything's out of the way. Just kind of slide it into place. You have complete perfect alignment with the fender. The seal completely goes around the entire opening. No fitment issues.

Now, I want to show you the aftermarket unit. The fact is, before I put that in, I'm going to go ahead and load the bulbs in. Because you will need to use your existing bulbs. On this aftermarket unit, it's got this little wavy metal washer. That needs to stay inside the bulb retainer. That way it keeps tension on the bulb whenever you twist it into place.

Resisting bulb sockets simply twist into place. Now, I'm going to go ahead and get our connectors here. And if your connectors are broken, we have new pigtail connectors. You can check out our blog on how to replace those pigtail connectors.

Get everything plugged back in, and you can slide the headlight into place. And again, you have a complete seal around the fender. Perfect fitment, nothing going wrong here. Not like a whole lot of the other aftermarket lights that have a huge gap around the fender area. Now, for more lighting options for your Mustang, check out LatemodelRestoration.com.