Common Problems Encountered in Your Volkswagen Jetta Tail Light Assembly
To understand what tail lights do, you need to take a look at accidents. People get into accidents partly because of faulty tail lights--they don't know if the vehicle in front of them is coming to a stop or not. This is why it is important to keep your tail lights working. Here are a few problems that your tail light might experience as you drive along the road.
Bulbs have burned out
Tail lights have bulbs, and these have a tendency to burn out over time. There are many reasons why they constantly burn out. Some burn out because of a faulty wiring that delivers voltage improperly; others burn out because the bulb socket shorts-out and the voltage overloads. You should regularly check your bulbs for signs that they are about to burn out and you should fix your wiring before replacing them.
Burned out sockets
Sometimes the problem with tail light assemblies is with the bulb socket itself. Bulb sockets burn out because the voltage that reaches it is either over or under the regulated current or the assembly has bad wiring. Check your vehicle's wiring if you suspect that your bulb socket is burning out. You should replace the grounded wiring quickly to avoid any more problems.
A fuse acts as a voltage regulator for electrical parts. As fuses get older, problems like short circuits and overloading get more and more common. If your tail light doesn't light up as usual, you should check your fuse out for any problems. Usually, when a fuse burns out, your lights may not work. If this happens, you should replace your fuse with a new one to avoid further damage.
Other useful tips
You could take the bulb socket and the bulb off and check their connectors if there is nothing wrong with your tail light. Sometimes corrosion and rust can play a big part in making your electrical connections fail.