My furuno 1621 will not turn on..
I have the same problem with my 1621 it was sent to furuno before xmas just found out that the unit is to old they now hold no spares the only way I could get it working was to heat it up with a hairdryer or leave it in the sun in the summer.
With a voltmeter, verify that you are getting 12V at the plug end of the power cable. If so, check the fuses (there should be one or two fuse holders on the back). If all of that fails you will need to send it in to Furuno for repair.
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