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Icom IC-M330GE VHF Radio wiring diagram
European GNSS/DSC marine VHF, nominal 13.8 V with 10.8–15.6 V input range. Maximum DC draw is 5 A while transmitting at 25 W RF, or 1 A at maximum receiver audio. Preserve the supplied fast 10 A fuse. Separate antenna, ground and NMEA interfaces require installation checks.
- Nominal voltage
- 12 V
- Compatible systems
- 12 V
- Continuous draw
- 5 A
Wiring diagram
How the IC-M330GE 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.
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 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.
10 ft one way
12 V system
- Wire
- 13 AWG · 2.5 mm²
- Example fuse
- 10 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.
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
Supporting parts
- 20 ft total of 13 AWG (2.5 mm²) marine cable
- Terminations for 13 AWG cable, matched to the equipment's screw terminals, leads or studs
- 10 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. A7420D-1EX-10, September 2023), checked 2026-10-01. Manufacturer documentation →
Select the GE variant and its supply
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.
Protect the DC feed separately from the RF system
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.
Identify the data and antenna interfaces
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.
Commission DSC deliberately
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.
Manual and scope
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.
Technical reference
Specifications and terminal map.
Check the model, ratings and connection points against your own unit before choosing installation hardware.
Catalog specification
European GNSS/DSC marine VHF, nominal 13.8 V with 10.8–15.6 V input range. Maximum DC draw is 5 A while transmitting at 25 W RF, or 1 A at maximum receiver audio. Preserve the supplied fast 10 A fuse. Separate antenna, ground and NMEA interfaces require installation checks.
- 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.
Red +
positive · input
Black −
negative · input
Ground
ground · bidi
NMEA 0183
signal · bidi
VHF/GPS RF
signal · bidi
A dash means a current rating is not specified here.
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 — the US reference, and what Transport Canada accepts as an alternative to TP 1332 for pleasure craft under 24 m. 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 IC-M330GE.
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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