How do I connect Yanmar Panel B “idiot-light” alarms to Actisense EMU-1?

You may find that the Yanmar Panel B won’t allow you to connect your “idiot-light” circuit in parallel, as the EMU-1’s 50kohm input impedance may be enough to very slightly activate a sensitive engine buzzer. However, you could try the following fix:

– Break the output from the alarm sender and connect it to a relay on the low side with V-Ignition on the high side of the coil.

– Tie the common of the relay output to ground and connect the NO contact to the idiot light.

– On the NC contact, tie that to V-Ignition with a 2Kohm resistor and connect it to the EMU-1 input.

– Set the EMU-1 so that the alarm is active when the voltage is above (say) 5 Volts.

If the above fix doesn’t solve it for you, please contact our support team by raising a ticket here

For more information on NMEA 0183 and how it works, please download our free guide to NMEA 0183 networking.
For more information on NMEA 2000 and how it works, please download our free guide to NMEA 2000 networking.