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Simrad Power Cables

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Simrad Power Cables at Bottom Line Discount Marine

Clean, stable power is the foundation of a reliable marine electronics installation. A chartplotter that reboots at speed, a display that dims in rough conditions, or a unit that throws spurious errors is rarely a hardware problem - more often it traces back to an undersized wire, a shared circuit with too much load, or a corroded connection somewhere in the power run. A proper Simrad power cable installation done right from the start eliminates an entire category of on-the-water frustration before it ever starts.

At Bottom Line Discount Marine, we carry Simrad power cables and power cords designed for Simrad display units, so you have the right starting point for a clean, purpose-built power run to your helm electronics.

Why a Dedicated Simrad Power Cable Run Matters

Marine electronics manufacturers - Simrad included - consistently recommend dedicated power runs for their display units rather than tapping into shared circuits already serving other accessories. Here is why that recommendation matters in practice:

  • Voltage stability - Sharing a circuit with bilge pumps, livewells, lighting, or other accessories that cycle on and off creates voltage fluctuations that affect display performance and longevity. A dedicated Simrad power cord run directly to the battery or distribution panel isolates the display from those fluctuations.
  • Proper wire gauge - Undersized wire creates resistance, and resistance means voltage drop - the difference between the voltage at your battery and what actually arrives at the display. Simrad specifies minimum wire gauges for each display model based on current draw and cable length, and staying within those specifications is not optional for reliable operation.
  • Correct fusing - Every Simrad power cable wiring run requires an appropriately sized fuse or circuit breaker as close to the power source as possible. The fuse protects the wire, not the display - an unfused or improperly fused run is a fire risk on a boat where access to a burning wire behind a helm console is limited.
  • Clean ground path - A solid ground connection to the battery negative or common ground bus is as important as the positive run. A poor ground is one of the most common causes of interference, display instability, and corrosion damage in marine electronics installations.

Simrad Power Cord Compatibility by Display Series

Simrad display units across the GO, NSS, and NSO series use display-specific power connectors - the power cable that ships with or is sold for one display model may not be the correct fit for a different series. Confirming the correct Simrad power cable for your specific unit before purchasing is particularly important when replacing a damaged cable on an existing installation or building out a new helm with multiple displays that may use different connectors.

Replacement and aftermarket Simrad power cables typically terminate in bare wire ends on the supply side, requiring connection to ring terminals, a fuse holder, and the boat's power distribution system. Taking the time to use properly rated marine-grade ring terminals - crimped rather than soldered for vibration resistance, and protected with adhesive-lined heat shrink - is the difference between a connection that lasts and one that corrodes within a season.

At BLD Marine, we stock the accessories that make a proper Simrad installation possible, backed by a team that understands marine electrical systems. And every purchase here supports Rifles to Rods, The Fishing Academy, and Reeling in Serenity - programs connecting veterans, youth, and women in recovery with the healing power of being on the water.

Browse our selection of Simrad power cables and power cords below and get your electronics wired correctly from the start.

Frequently Asked Questions

What wire gauge do I need for my Simrad power cable run, and how do I calculate it?

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Wire gauge selection for a Simrad power cable run depends on two variables - the current draw of your display unit and the total length of the cable run from the power source to the display and back to ground. Simrad publishes current draw specifications for each display model in their installation documentation, and ABYC standards provide wire gauge tables that match current draw and run length to the appropriate wire size. As a practical guideline, most single Simrad display installations on cable runs under 10 feet are well-served by 16 AWG wire, while longer runs or high-current installations require stepping up to 14 AWG or larger to keep voltage drop within acceptable limits. Running one gauge larger than the minimum is a sensible practice for marine installations, since it provides headroom for the wire degradation that occurs in a salt and moisture environment over time. Always verify against Simrad's installation manual for your specific model before finalizing wire selection.

Can I splice or extend my existing Simrad power cord, or do I need to replace the entire cable?

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Splicing a Simrad power cord is technically possible but introduces a connection point that is a potential failure location in an environment where vibration, moisture, and temperature cycling are constant. If a splice is necessary - for example, when a cable is damaged partway along its run and full replacement is not practical - the splice must be made using properly rated marine-grade butt connectors with adhesive-lined heat shrink, or a waterproof splice connector rated for the wire gauge in use. Twist-and-tape splices and standard electrical wire nuts are not acceptable in a marine power installation. Where the installation allows, replacing the full Simrad power cable with a continuous run is always the more reliable option and eliminates the splice as a future failure point. If the existing cable is too short to reach a relocated display, a Simrad power cable of the correct length for the new run is the cleaner solution.

Should I wire my Simrad display directly to the battery, or to a fuse panel or distribution block?

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For most recreational boat installations, wiring your Simrad power cable to a properly designed fuse panel or power distribution block is the preferred approach over a direct battery connection. A distribution panel provides individual circuit protection for each accessory, makes it easy to isolate the display circuit for troubleshooting, and allows you to disconnect the display without disconnecting other electronics. What matters most is that the run from the distribution panel to the battery is adequately sized for the total panel load, and that each individual circuit - including your Simrad power cord run - is fused at the panel with the correct amperage for the wire gauge used on that circuit. A direct-to-battery run is also acceptable and is sometimes preferred for high-current installations or when eliminating any potential panel-related voltage drop - but it still requires a fuse installed within 18 inches of the battery positive terminal per ABYC standards.

How is a Simrad power cable different from a standard marine power cable I could buy at a hardware store?

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A Simrad power cable sold specifically for Simrad displays is matched to the proprietary power connector on the display unit - the connector end that plugs into the back of the unit is Simrad-specific and is not a standard connector available at a hardware store. The supply end of the cable typically terminates in bare wire or ring terminals that connect to your boat's electrical system using standard marine wiring practices. Using a generic power cable without the correct Simrad connector requires modifying the cable or the display, which voids warranty and creates a connection point that is not rated for the installation environment. A genuine Simrad power cord ensures the display-side connection is properly seated, rated for the display's power requirements, and maintains the weatherproofing integrity of the rear connector panel - none of which can be guaranteed with a fabricated substitute.