Furuno fi-304 Instruction De Maintenance

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2.1.3 
Connection of log transducer
If you have another log instrument i.e. a FI-30 Log, you may connect the single log
pulse wire from that instrument to the Compass Data instrument terminal 4.
If you don’t have a log instrument, but want to install a log transducer, use the
connection box (Art. no: 21453).
From log transducer
3A Fuse