Question about Garmin GPSMAP 421 GPS Receiver

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Power I have a gps421 I purchased about 2 years ago. I used it 3 or4 times and it worked well. I had some issues with the cord fitting on the 421 but was able to power up n use. Last year 2013 I could not power it up and just put it away. I have been unable to power it up n don't know why. I connect to charged battery but it won't power up. My guess is the power cord just because it seems difficult to connect. I checked the fuse n it seems fine. Any ideas

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  • Garmin Master
  • 3,904 Answers

I would locate the actual power supply that is supposed to be with it and try that. Using the wrong one has either ruined the connection point or fried the unit.

Posted on Apr 14, 2014

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SOURCE: Garmin C340 battery not charging

The Garmin batteries tend to die after about 2 years. Garmin will replace the battery for you but prepare to pay top dollar. It is a shame because the problem is commonplace. They should have made the replacement user friendly. The battery is buried deep inside and it is soldered.

Posted on Jul 13, 2008

cd_droptop
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SOURCE: garmin fishfinder 160 blue . no powerup

I have a 160 blue also, and this morning I had the same problem. I called tech support while I was out on the water but no help. When I got home I double checked my connections on the battery minder/selector and the fuse panel. My GPS worked fine but the FF only beeped, like it had low power and the display wouldnt come up. It came up once for about a second and then faded earlier on the water. I pulled the power and ground connections from the fuse block and put them directly on the battery, it came right up. I now run the FF wired straight to the single battery and the GPS and other items on my other battery.

Hope it helps.

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Posted on May 01, 2009

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SOURCE: My Garmin 255w will not power up. Can this device be fixed?

Do a soft reset by pushing the power switch to the left and hold it there for 10 to 15 seconds. The unit should turn on.

Posted on Jun 22, 2009

bestdarngood
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SOURCE: My Garmin 305 has stopped working. It is 1 1/2

If it won't start, try connecting it to your computer and see if you can get a firmware update to turn it on. Otherwise I would send it into garmin since there aren't replaceable parts for consumers.


Benjamin

Posted on Jul 17, 2009

  • 1584 Answers

SOURCE: garmin 178c turns off on it's own.

Hi

Sounds very much like the wiring plug connections in the back, always overlooked but so important that connections are tight and contacting.

Posted on Aug 13, 2009

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