Why Tail Lights Stay On When Cars Off

When you turn your car off, the tail lights should automatically turn off as well. But sometimes they don’t, and you wind up with a blinking light on your vehicle. Why does this happen? And can you fix it?

The Main Causes of Tail Lights Stay On

There are a few reasons why tail lights might stay on even when the car is off. One common reason is that the fuse for the tail light is blown. If the fuse is blown, it means that there is too much current flowing through the wire and it could start a fire. Another common reason for tail lights staying on is because of a broken wire. If there is a broken wire, the light will still turn on because there is some sort of current flowing through it. However, if the wire is very broken, there may be no current at all and the light will stay on constantly.

How to Fix a Tail Light That Stays On

If your car’s tail light stays on when the car is turned off, there are several possible causes. Here are some tips to help you fix the issue:

1. Check the fuse. If the tail light stays on even when the fuse is replaced, it may be that the wiring in the area is damaged or shorted out. To test this, try replacing only one of the tail light bulbs with an incandescent bulb to see if the light switches off. If it does, there’s likely a problem with the wiring near the fuse box.

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2. Check for power to the tail light. Make sure there is power coming from the battery to the tail light. Test this by turning off all of the lights in your car and then turning on only the tail light. If it stays on, there may be a problem with either a ground wire or a power wire near the taillight socket.

3. Check for an error code. If none of these fixes work, you may need to check for an error code and troubleshoot from there.


Cars can come with all sorts of nifty features, but one of the most confusing is why tail lights stay on even when the car is turned off. In this article, we will explore the science behind how cars turn off and what happens to the power to your tail lights when you do. We will also share a few tips on how to prevent your tail lights from staying on in cold weather, so that you can enjoy those long drives in comfort and safety.

DynoCar is the best place to find information on all things cars, whether it be a car buying guide or how to change your oil. We’ve made finding and staying in touch with car information easy and fast.



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