Garmin Chartplotter Powers Down Intermittently

If your Garmin marine device shuts down intermittently, here are a few things to check:

• Check the power cable fuse to make sure it's the correct size and the element is intact. To verify the fuse is intact, connect a multimeter to both ends of the fuse and measure for resistance. If the fuse is good, close to 0 ohms should be shown on the multimeter.
• Ensure proper voltage. Garmin chartplotters require a minimum of 12 volts. Refer to the device's installation guide for acceptable range. When testing voltage, test the female end of the device's power cable (The end of the power cable that plugs into the Garmin device).
• Check if the power cable is damaged or modified. Cutting, nicking or extending the power cable may cause power issues.
• Check for voltage drops or spikes (example: device shutting down immediately when engine is started or with increased boat speed). Add a voltage data bar to the chartplotter to help monitor the voltage fluctuation.
• Ensure good connection points. If length allows, cut the old ends of wire off (power and ground), strip back sheathing and make a brand-new connection.
• Check the connections for corrosion and oxidation. Be sure both the power cable and the device power port are free of both. To clean corrosion or oxidization, use a microfiber cloth and mild soap and water. Avoid harsh chemicals like ammonia-based products. 
• Check the power cable contacts. Mushrooming or spreading of the bronze connections may occur if the power cable is constantly being removed from the device.
• Check for fuse panel or wire block usage. Temporarily bypass any fuse panel or wire block and wire directly to the battery.

If the above troubleshooting steps do not resolve the issue contact Garmin Support.