Troubleshooting Your Flashlight

It's never a fun situation to discover that your flashlight is not working the way that it should and the way that it's always worked before. Thankfully, many flashlights come with excellent warranties to make sure that you're covered from any manufacturer defects. Before resorting the warranty, it's always a good idea to see if the issue with your flashlight can be easily fixed without sending it in for warranty. This can save time, money, and you don't need to worry about being without your flashlight during repairs! On this page you'll find common issues and tips for how to maintain your flashlight and troubleshoot your flashlight.

General Troubleshooting for Flashlights

What Issues It May Fix

My Flashlight Won’t Turn On

My Tail Switch Isn’t Working Properly

My Side Switch Isn’t Working Properly

General Troubleshooting Steps

1. Tighten tail cap

    A common issue we see with many flashlights is that they’ll have a loose tail cap which can prevent the flashlight from turning on or make it act a little funky. The good news is, it’s an easy problem to fix! Below, we’ll use Klarus tail caps in the pictures to show you how to tighten your tail cap.

    You’ll see a small hole or a couple small holes around the outer ring of the tail cap. For Klarus flashlights, these holes are usually near the threads. Take a small tool or pocket knife to turn the tail cap clockwise until there’s resistance. Your tail cap is now tightened!

    2. Try out new battery

      Another common issue we see is just having a bad battery. One way to check if the battery is the issue is by testing out different batteries. If you have a spare battery, test this out in your flashlight to see if it works. Make sure to only use high-quality batteries from reputable brands. We have seen certain batteries not work well with flashlights.

      Alternatively, you can test out the battery that may not be working in another flashlight and see if it does or doesn't work and go on from there.

      3. Clean battery tube

        Sometimes, dust or a bit of dirt can get inside the flashlight body, especially when removing and replacing batteries. Even a small bit of dust can affect the battery contact with the flashlight. Blow into the battery compartment to try to clear it of dust or debris.

        4. Check o-ring

          Sometimes the o-ring on the flashlight can get knocked out of place and it will prevent the tail cap or head of the flashlight from tightening down all the way. Below, I've included a picture of where the o-ring should be located on the flashlight. If the o-ring is located on the threads of the flashlight, take some tweezers or use your fingernails to pull the o-ring back into the proper spot. Also, make sure that your flashlight tail cap or head is tightened all the way.

          5. Check to see if your flashlight’s side switch is locked out.

            Many flashlights come with a lockout mode. I'm going to reference Klarus flashlights here. Many Klarus tactical flashlights that have a side switch are able to lock out that side switch. When you press the side switch, you'll see the indicator flash three times. This indicates that it's locked out. To unlock the side switch, triple click the side switch three times and it'll work again.

            With flashlights such as the G series Klarus lights, to unlock them you can triple press either the tail switch or side switch three times.

            With the Klarus XT11GT and XT11S, both of these flashlights come with a third programmable setting called the Advanced Tactical Setting. In this setting, the side switch will be locked out, and the flashlight will only operate in turbo and strobe. If this is what you're experiencing with your XT11GT or XT11S, all you need to do is switch to a different setting. To do this, hold the side switch down for 10 seconds until you start to see a flicker. Then, while keeping the side switch held down, use the mode switch or paddle switch on the tail cap to switch between programmable settings.

            Charging Issues with Flashlight

            What Issues It May Fix:

            My flashlight isn’t charging properly

            My Klarus rechargeable flashlight’s indicator is flashing yellow

            When you see a flashing yellow or orange indicator on your Klarus flashlight when it's charging, it can certainly cause concern. However, the reason it's flashing yellow could be many different situations and doesn't necessarily mean your flashlight is defective! Follow the steps below to see if they help.

            Rechargeable Flashlight Issues Troubleshooting Steps

            1. Make sure charge port is clean

              Inspect the micro USB port located on your flashlight or the magnetic charging port located on your flashlight, and make sure it's free of dust or dirt. If you have a micro USB port on your flashlight, blow into that little port to clear it of any debris that might have gotten into it. If you have a magnetic charging port on your flashlight, use a cloth or a slightly damp cloth to clear away any dirt that may have accumulated on the port.

              2. Try out a new wall outlet

                If your flashlight isn't charging correctly, make sure to try out different wall outlets in your house or even the USB port on your computer to double check and make sure that it's not a faulty wall outlet.

                3. Test out a new charge cord and wall adapter

                  Try out a new charge cord and wall adapter to see if either of these items are defective.

                  If you don't have a new charge cord and/or wall adapter, try out the charge cord and wall adapter on another USB device to confirm If they are or are not defective.

                  If none of these steps have helped, it's time to move onto warranty. Please visit our warranty page and fill out the warranty request form. If you are needing warranty for a Klarus flashlight, please email