I chaned the bulbs for my tag lights and my lights still won't turn on

There is not a separate fuse. The tag light is powered off of the tail lights. If you have tail lights but no tag lights your problem is either bad tag light bulbs or the connections between the tail lights and the chassis ground at the tag light bulb sockets.

Either the rt frt bulb or rt rear bulb elements are melted together inside the bulb. I would replace all of the signal light bulbs.

Change the license tag light bulb.
Change the left turn signal light bulb.
Change the headlight bulb.

You can check the fuse, but the problem usually is the bulb or the socket contacts where the bulb plugs into.
Tag lights (license plate lights) are exposed to a lot of weather/road exposure and bumps/vibration, which shorten their life.

Rarely is a "tag light fuse" listed. The tag light is typically on a circuit with several other lights or accessories, and most commonly on the taillight circuit fuse, but not always.
Only a wiring diagram or a manual will be able to verify which circuit/fuse it is on, so you may have to check several fuses.

IF it turns out to be a blown fuse, your first step should then be to trace and identify the source of the electrical short (usually in wires by the tag light itself). Simply replacing a fuse is NOT a cure or a good 'repair'.

(As I write this, I have 2 tag lights out on my vehicle,, one which I verified is a blown bulb, and the other due to a badly corroded bulb socket)
Please rate via the helpful button if this helped answer your question, and please post back (via comments) when you discover the actual source of the problem.

usualy there is a faulty earth to the bulb cluster remove them and clean all the conectors spray the harness and cluster with wd40 or similer put all bulbs back in and see if that works but i would go with a bad earth hope this helps ivan uk

Use a test light to check for power to one side of the lamp. If that is the only light out it probably isn't a fuse, but it is worth checking it anyhow. You might have to look for a broken wire in the trunk.

Vehicles: 2004 Buick LeSabre 3.8L SFI OHV 6-cylinder

From sylvania.com:
License plate light bulbs - 2 compatible tag light bulb types:
(1) 161
(2) 161LL (LL stands for "Long Life")
SYLVANIA Long Life miniature bulbs perform twice as long as any standard miniature bulb. Designed for durability, lower maintenance and greater safety.

These are available online, and also at every auto parts store:
http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_Long-Life-Incandescent-Mini-Bulb-Sylvania_5080167-P_1259_R'GRPLAMPAMS___

Since no maintenance manual covers this, do what mechanics do when maintenance manuals fail - get creative.

Unscrew or pry off the lens cover, pull out the License Plate's Type 161 bulb, and insert a new 161 or 161LL bulb, and replace the cover.

Test your installation by turning the ignition key to the "Accessory" position, which will turn on the running lights and the license plate light.

had the same problem. Took to dealership and had it checked. They told me that the fog lamp and low beam lights had been swapped. Each socket and bulb in the others location.

The fuse labeled REAR PARK LP 15A in the right instrument panel fuse box powers the rear park lamps, and the tag lamps. If your rear park lamps are working then you most likely need to replace the tag lamps (bulbs). Use the following procedure to replace the lamps.

To Remove:

1. Remove the two mounting screws from the license plate lamp.
2. Remove the license plate lamp from the rear bumper fascia.
3. Remove the license plate lamp socket by turning it counterclockwise.

To Install:

1. Install the license plate lamp socket by turning it clockwise.
2. Position the license plate lamp to the rear bumper fascia.
3. Install the license plate lamp mounting screws.

The tag lights are on the same fuse as your parking lights check your bulbs the little bulbs don't last long both of them are probably blown.I am assuming you are talking about the license plate lights.