Tag light is not working. is there a fuse that will get the light turned back on?

Tag lites work off the running lite fuse.

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)
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Maybe you didn't reconnect the ground for those lights. Check for tail light fuse or IP lights fuse. You may have to get a test light or voltmeter, and start looking for where power is lost. Start at the rear light sockets, and work back to the front, to the park light switch.

have you checked the fuse in the fuse box side lights have a fuse.

check for power at the wires going intop the tail lights, real common that the circuit board is bad, but unlikely both at the same time. The tag, tail lights and brakes are 2 different systems. Do the turn signals work normally? if so the wiring from the turn signal switch to the brake lights is GOOD. the stop light switch had\s a ORANGE wire that should have 12V if not ck STOP LPS fuse, when brake pedal is depressed, the WHITE wire is 12V (at the stop light switch) if that is OK, the turn signal switch COULD be bad. The wiring harness plug is near the back left under the tailgate, see if that is disconnected?

the license lights work off of the tail light fuse.check the sockets for power using a test light(make sure you have a good ground).if no power then check were the wires are under the truck behind the bumper and move back down the wire 4" or so until you get power on the license light wire.there is a plug connector for the license lights at the back that may have a poor or damaged connections.

I would check the fuses first.

Check with a test light to see if you have power at the tail light socket. If you don't, check the fuse. If the fuse is burnt, that's your problem. If it's not, check for power in the wires. Keep testing from back to front unil you find power. If one is broken or shorting out, the most likely place to find it is under the car, near the back where gravel stones can damage them.

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.

If you don't have a manual, just get a test light, and ground it to your door hinge. At the back of every fuse, you will see part of the metal filament showing through. Touch your test light to each side of the fuse. You should have power to both sides of every fuse (when your key is on). If no voltage on one side, the fuse is burnt.