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If the voltage supplied is within the rather broad specifications and requirements of this model, and also if it stays that way even when under load, then your EchoMap has a severe problem that is covered by warranty from Garmin.
(There is no 'reset' for a not-powering-on problem with this sort of device, except perhaps to disconnect it from the power for at least 1 hour and try again. I would presume that this has already been tried, if not, it should be tried just once.)
To send it to Garmin for warranty-covered, free-of-charge repair, go to
and use the
file a claim link to start the process.
Information on Garmin warranty coverage is to be found here, for your reference - the basic information on that is, that the warranty is good for one year after purchase date:
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