Marine horn/lamp relay requirements

The alarm pin on a chartplotter/sounder can accept a current draw of up to 100mA. Anything above 100mA requires a relay.

If the horn and/or light you are installing has a current draw under 100mA, you do not need a relay.

For more information on installing a horn or light, please refer to the installation manual for your unit.

Click here to find and download the installation manual for your unit if needed.