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I purchased a Garmin nuvi 1390T for my trip to Florida this past October which proved to be very helpful for not only in mapping the trip but for finding motels etc. I have not used the unit since then until this week and find that the unit does not show a conection using the external power source cord provide with the unit when plugged into my automobile aux power outlet. A signal indicating "external power is lost" appears. Could you explain what to do with the unit? Walter Kyllonen

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  • wkyllone Dec 29, 2010

    The problem is not the fuse. The aux power works for oter applications. I have tried using the external power cord in two vehicles to no avail. I supect an internal problem with the GPS.
    Walt

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If you have the satnav plugged into the cigarette lighter socket and there's no power reaching the satnav it's possible that the fuse in the charger has blown.

First you need to check that the cigarette lighter socket is working but I assume you've done that. Then to check the fuse in the charger unscrew the ring at the end of the plug that goes in the cigarette lighter socket. The plug will come apart and you'll see the fuse. Be careful not to lose the silver nipple at the end of the plug. Replace the fuse and it should solve the problem. Also make sure the mini USB plug is fully pushed into the back of the satnav as this can sometimes cause problems. Even though it feels fully pushed in it may not be. Hopefully this will solve your problelm. If not you might need a new charger.

It's not good to let the battery run down too far in the satnav as sometimes this causes it to be unable to hold a charge again so if you don't get the charger working plug it into your computer and let it charge from it. This will take 8 hours approx. Also unplug your satnav charger before starting the car as you can get a surge of power when starting which can damage the satnav.

Posted on Dec 30, 2010

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Have you check the fuse for the "aux power"?

Posted on Dec 29, 2010

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