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1. Make sure that the charger outlet is supplying +12VDC. Try another device by plugging it into the outlet and seeing if it powers on.
2. Make sure that the fuse in the charger tip is not blown. The tip usually unscrews. It is spring loaded so be careful that the fuse, spring and power tip are not lost. Check the fuse. It should read 0 ohms with an ohmmeter. If it is glass hold it up to the light and see if the wire inside is open (broken). If the fuse is bad, replace it with the same value.
3. Make sure that the charger outlet is controlled by your ignition. If the the unit is on all of the time, regardless of the ignition setting, then the outlet is wired directly to the battery via a fuse.
4. Does the unit power up on its internal battery? Is the charger working? If it is bad, the unit will not power up when plugged into a 12VDC outlet.
You had your GPS plugged into your vehicle power outlet (AKA cigarette lighter) and you thought you were charging the battery all along. However, your power outlet was not "live" (you checked?) so you replaced the fuse. Your GPS was telling you LOW BATTERY and turned off, and that was why you checked the fuse and it was blown, right?
So now, your power outlet is hot (you checked it right) and you have a good 12 volts DC. You have your GPS plugged in and it still says LOW BATTERY and shuts off. Is there a fuse in the GPS plug? Have you checked for this? Are you able to check the voltage where the cord plugs into the GPS with a volt meter?
There is that possibility that everything is well with your power supply - but you must check and assure you have power. If it is, and your GPS still says LOW BATTERY, I would be inclined to take it for a drive with it plugged in and turned off. At the end of the drive, try it again. (Is your power outlet HOT when the car is not running?) If all is well with the power and you have tried to charge it, the battery may not be accepting the charge due to a battery fault. I don't know if you have the tools required to change the battery or not. If you do and if you can find the battery (there are lots of batteries available at many sites) and it does not cost more than a replacement GPS, I would suggest you give it a try. What the heck, it doesn't work now so you don't have much to loose except the price of the battery.
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If I missed the ball, please provide a little more detail on the matter and I will try again.
If your GPS unit powers down before it can fully boot up, use the steps below to charge the GPS unit and test the vehicle power cable:
Connect device to a computer that is powered on
The unit should power On when you plug it in showing a computer plugged into the GPS unit on the screen (Mass Storage Mode)
Press Reset button on the bottom of device if it does not power On*
Allow the unit to set and charge for 3-4 hours
Once the device is charged please take it to the vehicle and test it on the vehicle power cable.
Connect the device to the vehicle power cable
Connect the vehicle power cable to outlet on vehicle
Power the vehicle On
Device should automatically power on
If a battery icon appears directly to the left of the time then it is not receiving a charge from the vehicle
Please check the fuse in the vehicle power cable
The end of the cable unscrews to reveal this fuse
Check to make sure the wire element inside the fuse is in contact and that there is no discoloration.
If you see either of these the fuse needs to be replaced with the replacement fuse specifications listed on the sticker attached to the cable.
If the fuse looks good and there is still no light, the vehicle power outlet may need to be checked to see if it has power.
*Note - The reset button may be found on either the left or right side. In some cases if the device does not have a reset button slide the power key to the left or On position for about 10 - 15 seconds.
You need to check the fuse for both the car's cigar lighter AND the one in the GPS power plug (that goes into the cigar lighter outlet). Both must be good for the GPS to charge and power up.
I don't know if your friends cord worked in you car - or hers - so you're going to have to find out if it is the cord fuse or the car fuse. Since her cord worked on your GPS, start by using HER CORD connected to YOUR GPS in both cars. If it works in her car, but not in yours, check & replace your car's cigar lighter fuse. If or when it works in both cars, disconnect her cable and connect your cable to your GPS again. Connect into your cigar lighter. If it works, you're done. If it doesn't work, disassemble the plug at the end of the GPS cord (cigar lighter end) and check and replace the fuse if blown. You should be good to go at this point.
Please rate this reply if found to be helpful - good luck!
There are several possible reasons why a GPS unit might not turn on. For example, there could be something wrong with the charger such as a blown fuse, bad power adapter, or defective cable connection. The internal battery inside of the GPS also might be defective or worn-out. Or, worse yet, the unit may have a more serious hardware fault.
You don't say how you are charging the unit. I'd recommend trying a different charge method. The GPS can be charged one of three ways: connection to you car via the automobile power cord, connection to your computer via a USB cable, or charging from a wall outlet using an optional AC adapter. If you are charging the unit in your car, try connecting it to your computer (or vice versa). If the GPS turns on after being charged using one method but not the other, then that pretty much tells you that the problem is with the cable or adapter being used for charging.
The Garmin NUVI 650 does not contain an internal fuse, but there is a common 3 amp fast-blow fuse located in the vehicle power cord. If you find that the problem happens when trying to charge the unit in your vehicle, then you should change this fuse and see if that corrects the issue. The fuse can be replaced by unscrewing the black round piece at the end of the cigarette lighter plug.
If the unit does not turn on regardless of what charge method you use, then the fault is likely with the GPS itself. Either the internal battery would need to be replaced or the unit would need to be serviced to correct whatever hardware fault is causing the problem.
I would recommend you contact the manufacturer before you attempt to open up the unit. Opening the case of the GPS may void your manufacturer's warranty (if the unit is still under warranty).
when you plug in the normal cigarette liter into the socket does it pop up hot? if so I suggest trying to replace the power cord to the tom tom. your car only puts out 13.8 volts. any more than that the fuses would blow.
Check the fuse at the tip of the power cord. Unscrew the round black plastic and this will release the fuse. Otherwise there could be a problem with the power cord. If the cord is defective, replace only a Garmin replacement.