Why Does My Garmin Fish Finder Keep Turning Off?

Navigating the waters with a reliable fish finder is essential for many anglers and boaters. Garmin, a renowned name in marine electronics, offers a range of chartplotters and fish finders that are trusted by many. 

However, like all electronic devices, there can be moments of unpredictability. One common issue some users face is their Garmin fish finder turning off intermittently

If you’re grappling with this problem, you’re not alone. Let’s dive into the potential causes and solutions.

Why Does My Garmin Fish Finder Keep Turning Off

Garmin Chartplotter Powers Down Intermittently

When your Garmin marine device shuts down without warning, it can be both frustrating and concerning. Here are some troubleshooting steps to help you identify and possibly rectify the issue:

Power Cable Fuse Check

Before diving deep, start with the basics. Ensure that the power cable fuse is of the correct size and that its element remains intact. You can verify the fuse’s condition by using a multimeter. Connect it to both ends of the fuse and measure for resistance. A good fuse should display close to 0 ohms on the multimeter.

Voltage Verification

Garmin chartplotters need at least 12 volts to function optimally. Always refer to your device’s installation guide to know the acceptable voltage range. To test the voltage, focus on the female end of the device’s power cable – the part that connects directly to your Garmin device.

Power Cable Integrity

A damaged or modified power cable can be the culprit. Check for any signs of cutting, nicking, or unauthorized extensions, as these can lead to power inconsistencies.

Monitor Voltage Fluctuations

Voltage drops or spikes can cause sudden shutdowns. For instance, your device might turn off the moment you start the engine or when you increase the boat’s speed. To keep an eye on this, add a voltage data bar to your chartplotter. This will help you track any voltage changes in real-time.

Connection Point Examination

Over time, the ends of wires (both power and ground) can degrade. If the length permits, consider cutting off the old ends, stripping back the sheathing, and establishing a fresh connection.

Corrosion and Oxidation

These are silent killers for electronic connections. Ensure that both the power cable and the device power port are free from corrosion and oxidation. If you spot any, gently clean them using a microfiber cloth with mild soap and water. Steer clear of harsh chemicals, especially those containing ammonia.

Power Cable Contacts

If you frequently remove the power cable from the device, the bronze connections might undergo mushrooming or spreading. 

Regularly inspect these contacts for any signs of wear or damage.

Fuse Panel or Wire Block Usage

Sometimes, the issue might lie with the fuse panel or wire block. As a troubleshooting step, try bypassing these components and wire your device directly to the battery.

If, after trying all the above steps, your Garmin fish finder still powers down intermittently, it’s time to seek professional help. Contact Garmin Support for further assistance.

FAQs on Garmin Fish Finders Keeps Turning Off

If your Garmin Nuvi 2595 is consistently powering down, it’s often a sign of a low battery. It’s crucial to determine whether the GPS is plugged into the vehicle’s power port during these instances or if it’s operating without external power. Devices like the Nuvi 2595, when over 4 years old, might experience battery wear. In such cases, considering a replacement due to a worn-out battery might be the best course of action.
Garmin GPS devices can occasionally encounter power issues. To address this:
  • Direct Power Connection: Ensure your device is connected directly to your vehicle using the original Garmin power cable. Avoid using splitters, USB connectors, or third-party cables.
  • High-Current Power Cable: This cable should be securely connected to the antenna mount. A loose connection can lead to intermittent power disruptions.
Fish finders, or depth finders, are particularly sensitive to voltage levels. A slight drop in your battery’s voltage can cause some models to shut down automatically. It’s essential to ensure that your battery is fully charged and in good condition to prevent such interruptions.
To prevent your Garmin device from automatically turning off:
  • Access the Menu: Start from the main screen.
  • Access Settings: Navigate through the options to find the settings.
  • Select an Activity Profile: Choose the profile you’re currently using or wish to modify.
  • Choose Auto Features: This option will lead you to various automatic features, including sleep settings.
  • Enable or Disable Auto Sleep: Depending on your preference, you can enable or disable the auto sleep feature to control when your Garmin device goes into sleep mode.
By following these steps, you can ensure that your Garmin device remains active for as long as you need it.


In conclusion, while Garmin devices are built for durability and performance, occasional hiccups can occur. By following the above troubleshooting steps, you can ensure that your fishing trips remain uninterrupted and productive. Safe boating!

Gary Burrell

Chief Content Writer and Reviewer at Garmin Fish Finders.us

Born in 1989, Gary Burrell is an Electrical Engineering graduate from the University of Tennessee. With 20+ years of experience, he has transitioned from engineering roles to becoming the Chief Content Editor. Gary’s unique blend of technical knowledge and editorial expertise has made him an essential figure in content creation, ensuring clarity and accuracy. His journey from an engineer to an editor showcases his adaptability and commitment to continuous learning.

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