Load
Standard Horizon GX1400GPS/E wiring diagram
12 V marine VHF radio with internal GPS and DSC. Draw is 5 A transmitting at high RF power, 1.2 A receiving at maximum audio, or 0.3 A in standby. Preserve the supplied 6 A fuse. The 25 W radio rating is RF output, not DC consumption; NMEA 0183 and antenna connections are outside the power-only symbol.
- Nominal voltage
- 12 V
- Compatible systems
- 12 V
- Continuous draw
- 5 A
Wiring diagram
How the GX1400GPS/E is wired.
Open this example in Crimp to use your own parts and cable lengths. Review the assumptions and installation notes as you adapt the circuit.
The example retains the specified 6 A fuse and sizes for the 5 A transmit load. Receive and standby use less current. Antenna, DSC identity, position input and optional data connections require their own commissioning checks. Manufacturer installation manual
Edit this wiring exampleCable sizing for this example
Use the diagram as a starting point for your installation. Replace the example equipment and cable lengths with your own, and check the connections against your exact model's instructions.
3 m one way
12 V system
- Wire
- 2.5 mm² · 13 AWG
- Example fuse
- 6 A
- Design current
- 5 A
- Voltage drop
- 1.8%
Sized against ABYC E-11. The design current is the part's continuous draw. The length is one way; voltage drop includes an equal-length return.
Run-length and manufacturer assumptions
The editable example uses 3.048 m (10 ft) runs unless a shorter run is stated. Metric overviews round these to 3 m. Adapt the parts and lengths to your installation before choosing cable and protection.
The example retains the specified 6 A fuse and sizes for the 5 A transmit load. Receive and standby use less current. Antenna, DSC identity, position input and optional data connections require their own commissioning checks. Manufacturer installation manual
Supporting parts
- 6.1 m total of 2.5 mm² (13 AWG) marine cable
- Terminations for 2.5 mm² cable, matched to the equipment's screw terminals, leads or studs
- 6 A fuse and holder on the positive run
- Heat-shrink, strain relief and terminal boots sized to the cable
Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.
Installation notes
Before you install.
Open a question for model-specific guidance and sources.
Verified against the manufacturer's documentation (rev. EM065N202 / 2009S-DC-1, copyright 2022), checked 2026-10-01. Manufacturer documentation →
Radio power and radio output are different
GX1400GPS/E is a fixed marine VHF with internal GPS and digital selective calling. The advertised 25 W is transmitted radio-frequency power. The electrical table instead specifies 5 A during high-power transmission, 1 A low-power transmission, 1.2 A receiving at maximum audio and 0.3 A standby. The catalog uses the 5 A operating maximum for supply planning; daily energy depends on listening and talking time.
Connect a reliable radio supply
Connect the red lead to positive and black to negative, retaining the supplied 6 A fuse and holder. The nominal supply is 13.8 V, with the manual's specified tolerance; treat this as a 12 V installation. Use adequately sized extensions and protected, corrosion-resistant joints. Check voltage at the radio while transmitting, since a weak joint can work during standby and fail when current rises.
The canvas pair represents DC power only. An antenna connection, NMEA 0183 data wiring and external speaker connection are not battery terminals. The terminal limit is a protection-based planning bound rather than a separately tested connector rating. A replacement fuse should match the manual; repeated failure is a fault to investigate.
Install the antenna and verify GPS reception
Locate the radio where its controls and distress cover remain accessible and the rear cable bends and heatsink have space. Test satellite reception in the intended position before cutting a flush-mount opening. Use a suitable marine VHF antenna and coaxial installation, following the manual's separation and exposure instructions. Do not transmit with the antenna disconnected.
The radio's data interface is NMEA 0183, not a Micro-C NMEA 2000 socket. When connecting a plotter, match transmit to receive, polarity, sentence support and baud rate using the manual's wire-color table. Do not confuse those small data conductors with the separate speaker pair.
Set up DSC before depending on it
Confirm the vessel's assigned MMSI before entering it and check the completed identity. Verify that the display has valid position and time, from its internal GPS or correctly configured external source. A powered radio with no usable position is an incomplete DSC installation.
Check normal reception and a permitted routine radio/DSC test, rather than testing the distress button. If the unit resets on transmit, start with supply voltage, fuse-holder contact and cable joints. Poor range with stable power points toward antenna placement, coaxial loss or a damaged connector. Record both a listening test and a transmit test; they stress different parts of the installation.
Manual and evidence
GX1400/GX1400GPS/E operating manual, printed p. 4 (supplied fuse), installation chapters 6–7, DSC setup chapters 8–9 and p. 86 (current table). The marine ledger retains the full downloaded manual and hash.
Technical reference
Specifications and terminal map.
Check the model, ratings and connection points against your own unit before choosing installation hardware.
Catalog specification
12 V marine VHF radio with internal GPS and DSC. Draw is 5 A transmitting at high RF power, 1.2 A receiving at maximum audio, or 0.3 A in standby. Preserve the supplied 6 A fuse. The 25 W radio rating is RF output, not DC consumption; NMEA 0183 and antenna connections are outside the power-only symbol.
- Nominal voltage
- 12 V
- Compatible systems
- 12 V
- Continuous draw
- 5 A
Terminal map
Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.
+
positive · input
−
negative · input
Sources and sizing method
Equipment specifications. Model details, ratings and terminal roles come from the catalog. Check your unit’s label and current manufacturer documentation for its exact revision.
Example sizing. Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. Results use the example current and run length shown above. Set your actual equipment, lengths and installation conditions in Crimp before choosing hardware.
Read how the sizing worksNext step
Plan your installation with GX1400GPS/E.
Open this example as a new project, or add this component to your existing diagram. Use your equipment and cable lengths to review the sizing.
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