The trailer plug should have come from the factory pre-wired: a 4-wire plug standard or a 7-wire plug if the optional tow package was installed. If the harness has not been disconnected or come undone by accident, either you have a blown fuse or a bad relay. These are separate for the trailer/tow harness (i.e. your regular tail lights can be working fine but the trailer/tow fuse and/or relay may be bad). You manual should show you where your particular fuse/relay is located. Don't trust visual inspection; test then replace the defective part.
how to change the rear tail light bulb on a 2004 Nissan maxima
Your owners manual will detail where the fuse block(s) are and which fuses are for what. If it ends up being a bulb, see sources and related links below for bulb information.
pull down the tailgate and the screws to take off the tail light cover. pull that off and it is the bottom bulb
To replace the tail light bulb, open the tailgate and on the inside there is two little bolts. Take those out and the tail light should slide out, just turn the bulb holder and it comes out.
Sedan or hatch makes a difference
How do you change the tail light on a 2001 toyota sequoia
how to change tail light bulb on Toyota sequoia
To change the tail light bulb on a 2004 Mercury Mountaineer, first open the rear hatch and locate the tail light assembly. Remove the screws or clips securing the assembly, then gently pull it away from the vehicle. Twist the bulb socket counterclockwise to release it, then remove the old bulb and replace it with a new one. Reinstall the bulb socket, reattach the tail light assembly, and secure it with the screws or clips.
to replace tail light, you need to lower the tailgate> On the side of the bed that is covered by the closed tail gate are a couple of screws.Remove these screws and the tail light assembly can be removed.
How do you install passenger tail light kit for a 2004 grand cherokee?
lower the tail gate and look in tail gate jam. bolts are where the cables that hold tail gate are anchored
First of all pop the trunk and then use a screwdriver to pull the light out and go to Canadian Tire and purchase a new light.