I have a problem with power it works fine when on mains power i.e car charger but will not turn on with battery just get a fint dark screen can any one help me?? the batteries are fully charged it did work fine on them just stoped working iv tryed chane then to different ones but it still dose the same thing any help will be greatfull thanx
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When the charger is plugged into the unit, look at the main menu screen. If the charger is working correctly, the green battery icon in the upper right-hand corner eill go out. If the charger is plugged in and there is a light lit on the charger but you see the green battery icon in the upper right-hand corner of the screen on the main menu, then the unit is on battery power and the battery is not getting power from the charger. Common problem with these units are loose rear USB ports. More information can be found here:
Yes, many aftermarket chargers are not wired the same as a Garmin charger and will cause your Nuvi to think it's connected to a PC. What happened to the original charger that plugged into the cradle (the part your Nuvi snaps into?)
Does the car charger cord have a fuse in it at the point where it plugs into the lighter port, a lot of car chargers have a fuse, I can't tell if your end, the part that goes inside the lighter port has a cap that you unscrew to replace the fuse, and garmin does not show it.
If the car is running, and it does not work, there is something wrong with the car adapter, or the unit at the plug, the battery should not have anything to do with it.
If the battery starts the car the battery is fine.
Sound as though the I3 is not getting power from the lighter. Hook the garmin to your laptop and turn on the laptop, now turn on the I3, does it still shows low battery message on the screen? If the answer is yes then the USB connector has failed (know problem with the I3). There are many unit sold on ebay with broken USB connector. If the I3 doesn't show Battery Low then the lighter cable is defective.