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Old 06-24-2005
rngprerunner's Avatar
Thread Starter

I am: Jason G
Join Date: Jun 2004
Location: Long Beach CA
Vehicle: 1999 Ford Ranger
Posts: 3,453
Total Props: 2
How-To: Mustang Dome Light Install

Mod: Mustang Dome Light
Difficulty: 2/5
Time: 1- 2 hours tops.

Author : Michael Sunlin (Mnemonic)
Please direct all questions and comments to the author.

Today I was chasing down a rattle in my headliner, and had to go behind the dome light. So I figured that would be a good time to show everyone the Mustang Dome Light mod. This is a very simple mod, but 2004 and newer Rangers will have a little more work than earlier models.

Tools needed:
  • Philips & small flathead Screwdriver
  • 9/32" 6 point socket/rachet
  • Replacement Dome Light (From Mustang/Explorer/F-Series etc)
  • 3 screws (should come with new dome light, or you can match one to the two in your current dome light)
  • 1 Wire Tap
  • About 8 feet of wire (I used speaker wire)
  • Electric tape
  • Electrical Fish tape (not required but helpful)

PREPARATAION: Get your self a dome light. Some members sell them, or you can visit your local junkyard (or ebay) to find these items. I recommend Taurus and Mustangs, but F-series and explorers may also work.

Clean your dome light. Most often these devices are dirty. Just remember they are almost 100% plastic, so make sure to use a very mild cleaner. Some may prefer to paint the dome light housing as well as black housings are very rare. Check light bulbs for loose fillaments and replace if necessary.

Step 1: Remove existing dome light.
Pop off the plastic cover with a small flathead. Then take out the two philips screws and the old dome light should be off.

IMPORTANT! 2003 and older Rangers should have 2 wires visible behind their dome light. 1 wire is constant power for map lights(not used by stock dome light), and the 2nd is switched power for the dome light. Ground is to the chassis. 2003 and older rangers can skip to the last step of bolting the new dome light in.

Step 2: Removing trim.
We need to run power from the headlight switch to the dome light. So we must first remove the trim.

Start by taking off the dash access panel (or whatever it's called).

Then remove the grab handles on the A-pillar. This is accomplished by first removing the plastic trim plugs to expose the 9/32" hex bolts. These bolts are the same size as the 2 bolts that hold in the A/C bezel.

Now you can pull off the A-Pillar trim piece. Note there are 2 plugs (one in the pic) that hold this trim in place. Just pull the trim straight down (towards the ground) and it'll pop out. Just take your time, and wiggle it if it's not cooperating.

Remove the 3 philips screws that hold the sun-visor in place. After removing them, you should be able to drop the corner of the headliner, allowing you to run the wiring.

You should now have a clear shot to run the wiring. Start from behind the headlight switch, up the a-pillar, through the headliner and to dome light. I use this product called Fish Tape, available at home depot, that makes running any cable or wire a snap. It works just like a tape measure, but the tape is a little skinnier and a bit stronger. A must have if you plan on doing any long speaker runs in your home theater setup.

Step 3: Running the constant power wire.
Standard disclaimer: Caution, you can shock yourself and/or blow some fuses if you don't do this right, so be safe and disconnect the battery. is not responsible for anything.

Locate the Green wire with Orange Stripe behind the headlight switch. This is the wire missing behind the dome light on 2004 (and newer) Rangers. This wire is "behind" the power saver relay, which means this wire will deliver constant power for approximately 10 minutes without a key in the ignition. If you want constant power without any interuptions, you will need to run a line from the battery (with fuse) or tap into the fuse box (passenger kick panel).

Use a wire tap to splice into the Green/orange wire.

Run this wire up the a-pillar and in behind the Headliner. I attached my wire to the fish tape, and used that to run the wire to the dome light hole. You can also use a wire hanger, or just keep wiggling and pushing the wire until it makes it to the dome light hole. With the fish tape, it took about 30 seconds. Just take your time to tuck the wire behind any molding.

TIP: Those with high powered subwoofers may want to take this time to secure the power wire with plenty of tape and/or wire ties. I had to secure mine in many places because it caused a few annoying rattles when the sub hit.

Step 4: Wire in the dome light.

Put your fabrication hat on. There are many ways to do this, but the end result is you want your new power wire to connect to the screw circled in YELLOW. The RED circle is for switched power and this hole should like up with the black/blue wire Ford put behind the dome light. As stated before, the ground is the chassis. Just make sure the last screw hole (circled in DARK BLUE) lines up with a pre-drilled hole into the dome light brace.
YELLOW = Constant
RED = Switched
BLUE = Ground

TIP: Tape down the little plastic pieces marked by the yellow rectangle (or just remove them), as they may be yet another source of rattling/vibration. I kept them in, just in case they helped keep the light form bleeding through. They were there for a reason, right Ford?

The red square above marks another location you can use to tap the wiring into, but the screws are the easiest method.

Step 4b: Mounting the light.
By using the screws for ground and switched power (screwed to the factory locations) should be sufficient for a secure mount.

Step 5: Test the installation.
CHECK ALL WIRING. Make sure all dome light screws are contacting the factory wire, your power wire, or the chassis. Make sure the wire tap is in contact with the wire.
Reconnect the battery.
Close all doors to reset the battery saver relay. Then turn the rotary dial by the headlight switch to turn on the dome light. The center bulb should illuminate. Turn the switch back to "off".
Test the map light switches on the dome light. Each switch should turn on one bulb and one bulb only. It should be obvious which one that it. These map light switches should work independently of the headlight dome switch, because of the power wire you ran.

REMEMBER, that the wire we tapped into is behind the battery saver module. So after about 10 minutes or so, it will shut off. This will make sure you don't leave a light on over night and have a weak or dead battery the next day.

Step 6: Replace trim.
Follow step 2 in reverse order.

Mod Complete:
Looks MUCH better and now you have functioning map lights!

Edited by Jason Gonderman (rngprerunner) for format.

Imagine if sharks could walk on land... Scary.

1999 Long-Travel Ford Ranger XLT 4x4 4.0 4door
2007 F-150 5.4 FX4 SCREW

Last edited by 04blackedge; 03-03-2009 at 06:30 PM. Reason: Fixed pics
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