Load
See the Icom IC-M330GE VHF Radio connection points and wiring example. Open the diagram in Crimp to add your equipment and plan the cables between them.
Open this example as a new project. Use your own parts and cable lengths to make the plan yours.
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
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.
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.
This supply example retains the manufacturer's 10 A fuse. Follow the complete installation notes for connector polarity, mounting, controls and commissioning; verify the actual cable route and equipment revision. Manufacturer installation manual
Wiring diagram
Open this example in Crimp to use your own parts and cable lengths. Review the assumptions and installation notes as you adapt the circuit.
This supply example retains the manufacturer's 10 A fuse. Follow the complete installation notes for connector polarity, mounting, controls and commissioning; verify the actual cable route and equipment revision. Manufacturer installation manual
Edit this wiring exampleInstallation notes
Guidance for this model, with sources linked beside the relevant advice.
Verified against the manufacturer's documentation (rev. A7420D-1EX-10, September 2023), checked 2026-10-01. Manufacturer documentation →
This record covers IC-M330GE with the supplied GPS antenna and European channel variant. The operating range is 10.8–15.6 V DC, nominal 13.8 V with negative ground. It must not be connected directly to a 24 V bank. The manual states up to 5 A at 25 W transmit and 1 A at maximum audio, both at 13.8 V. Use the transmit value for supply planning; radio use and receive time determine daily energy.
Connect the supplied red positive and black negative cable, retaining its F 250 V 10 A fuse. Here 250 V is the fuse’s voltage rating, not the radio supply. Do not increase fuse current if it opens: find the fault first. Protect joined power, NMEA and speaker conductors from water as shown in the manual. The separate rear ground terminal is for the vessel grounding/interference arrangement; it does not replace the black DC return.
The VHF antenna uses a PL-259 connector on the radio’s antenna socket. Never transmit without an appropriate antenna. The supplied GPS antenna needs a clear sky view. NMEA 0183 input is yellow A/+ and green B/−; output is white A/+ and brown B/−. These are data pairs and must not be connected as power. The symbol keeps them as signal markers, with no implied DC continuity.
Enter and verify the assigned MMSI and any region-specific identifiers following the manual before relying on DSC. Check that the display has valid position and time from GNSS or a compatible NMEA source. Test receive audio and an appropriate routine radio check; do not send a distress alert to test installation. If the radio resets on transmit, measure voltage at its power connector during transmission and inspect joints. If it receives but has poor transmit range, inspect the antenna/coax rather than increasing DC fuse size.
Icom installation manual, A7420D-1EX-10, September 2023; printed pp. 53–58 for connections, fuse, mounting and electrical specifications; MMSI and DSC chapters. The original PDF is retained in the marine source ledger. The drawing represents the identified electrical interfaces; it does not simulate the equipment’s mechanical performance, radio signals or fluid system. Unpublished connector ampacity and startup current remain unspecified.
Build it out
Add IC-M330GE to your diagram, then connect your batteries, chargers and loads. Crimp calculates cable sizes and checks the connections as you draw.
Every cable you draw there is sized against ABYC E-11, from the same tables as the reference on this page.
Technical reference
Check the model, ratings and connection points against your own unit before choosing installation hardware.
Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.
Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.
Red +
pos
positive · input
Black −
neg
negative · input
Ground
ground
ground · bidi
NMEA 0183
nmea
signal · bidi
VHF/GPS RF
antenna
signal · bidi
A dash means a current rating is not specified here.
Method & provenance
Manufacturer specifications describe the equipment. Crimp calculates cable results from the circuit and assumptions you enter.
From the maker
Manufacturer, model, ratings and which terminal does what come from the catalog. A newer revision, or the nameplate on the unit in your hand, can say something different — when it does, the nameplate wins.
ABYC E-11
Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. The run length and the current above are what drive the result. Crimp doesn't know how warm your space gets; draw the cable inside an engine-bay zone on the canvas and it sizes for the heat.
Next step
Open this example as a new project. Add your equipment and cable lengths, then review the sizing and checks for your setup.