I have a 100v A/C power / charger unit for my garmin C340 GPS that I use to charge my Garmin's battery every day. I can use thj adapter to run the GPS, or just turn it off and let it charge the GPS. But it connects dirctly to the Garmin GPS unit, not to the cradle like the Cigarrette lighter unit does. .
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Before writing the unit off as dead I would try obtaining a new 12v power cable and maybe try your cable in someone else vehicle, often the 12v power in your car can short not providing power to the GPS.
I had the same problem on a trip. Required two fixes and once I did this the unit worked fine.
1. Replace the fuse in the car adapter (reason it wasn't charging when I used it in the car).
2. See the users manual on page 31 regarding resetting your C340. http://www8.garmin.com/manuals/StreetPilotc340_OwnersManual.pdf
I followed the instructions of the Online manual for the Garmin Street Pilot c-340, I removed the faceplate of the Street Pilot and then using my thumb pressed down on the reset button. I then pressed the power on button on the side of the device- the screen lit up, I then plugged one end of the USB cable into my computer and the other end into the device. The information on the screen of the device indicated the Lithium Battery was charging properly.
I've had a couple of Garmin C330 units and a C340. They're good quality except for the flimsy power plugs. My first one out of the box had a defective plug which made intermittent contact when I plugged it into the lighter. Tightening the knurled nut on the tip of the plug helped somewhat, but didn't fix it completely. It became a non-issue after I bought a friction mount which came with a better cord and plug. The friction mount also stopped the problem of the suction cup constantly falling off the windshield.
Hello KTFORE1, The Street Pilot 330 comes with both a vehicle power cord and a USB cord for connecting the unit to the computer. If I understand you correctly the GPS isn't getting power from the vehicle power cord. Does the GPS charge if connected to a computer using the USB cable? If so the problem is likely the power cord or cigarette lighter socket you are using. If the GPS doesn't charge from USB port on your computer then the problem is likely the GPS itself. If you determine that the cable is the source of the problem, check and replace the cable's fuse. You will probably also want to check and replace your vehicle fuses as the circuit that powers the cigarette lighter might have a blown fuse. If replacing the fuses doesn't solve the issue then you might need to replace the power cord. Best Regards. Ken "Go Ahead. Use Us."
Only use Garmin approved power connector either AC or DC (cigarette lighter adapter), otherwise you risk ruining your unit. The DC power adapter actually step down the voltage from 12vdc to 5vdc. Using anything other than a Garmin approved adapter can fried the unit.
Make sure that you age getting power from the plugin.
Test: With the unit OFF plug adapter into cigarette lighter.
The Garmin should turn on automatically. If it does not,
you are not getting power to the unit. Make sure you have
good connection at the holder.
Generally it powers off by itself because it is not receiving
power from the plug.