Question about Garmin Forerunner 305 GPS Receiver

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Wont turn on

It only turns on while on cradle, as soon as I disconect from cradle it turns off. it displays battery charging and battery charged complete messages.

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  • charl9 Mar 05, 2009

    As soon as I place it in the cradle the PC says new device detected. But as soon as I remove it from the cradle it dies. Hard reset did not help,

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  • 84 Answers

These units seem to be suffering from a bad connection on the inside of the unit. My wife's did the same thing. There was a connection inside that wasn't making contact. First try cleaning the 4 brass connection tabs on the watch and check your charger to make sure the tabs are raised and not squished. Second try to reset the unit. Hit mode reset and power buttons all at the same time. Hold these for 3 seconds and then release. If these do not work here is what I did. There are no screws holding the unit together. I used a exacto blade to very carefully pry the unit apart along the side seam. It's not easy to do. Be very cautious and gentle. Work the thickness of the blade into the joint to gently wedge apart. You are not trying to remove material! Once apart you will see some fingers that make a connection between the upper and lower part of the unit. This is where the problem was with my wife's 305. I gently raised these tabs to make a better connection, It's been working ever since. I didn't try it before but try pressing very hard on the unit where it says Forerunner 305. The case is very hard so it might not work. But if it powers up when pushing you found your problem. Hope this helps. Here is a link I found on opening a 205 (Same process) http://ctorunner.googlepages.com/dismantleforerunner205 To put the unit back together use Automotive silicon/gasket maker. Use a tooth pick to put a VERY small amount of silicon around the entire seam. Put the two half's together and wrap tightly with electrical tape. Test the unit immediately to see if it powers on and off. If it does not open it back up and raise the small prongs that make the connection from the bottom half to the top half. If any silicon squishes out the sides wipe with water and a rag. Let the unit sit over night. In the morning remove the tape.

Posted on Nov 13, 2009

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Posted on Jan 02, 2017

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1 Answer

The unit turns on and off every 1 minute (while charging) is there a way to avoid it this restart?


If this is happening while driving, you could have a cradle going out. Try moving the plug at cradle slightly and if it indicates battery then charges, your cradle is defective. Cradles can be found cheap at www.gpsnstuff.com.

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Battery is fully charged on my 205 and yet it turns itself off


Can it be turn on when the device is attached to the cradle with electric supply?
If so, I think the battey is aged and it cannot be charged to the operating voltage to turn the device on.
A change of battery is required.
I had such a case recently.

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You may have to replace your battery, these go faulty often, even though they seem OK.

Feb 07, 2010 | Garmin Forerunner 305 GPS Receiver

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Today i turned on my garmin after a few months, it was working will for about 2 min, then it lost satellites, so I turned it off, then tried to turn it back on, but it never turned back on. the battery...


If the GPS's internal battery is allowed to discharge too far, it will not be possible to recharge with the card charger, until it is brought up to a certain level. Connect the nuvi to a computer with USB cable overnight. This will trickle charge the internal battery to a level that will allow the car charger / cradle to keep the GPS charged from that point on. Anytime the car charger fails to recharge the internal battery, the USB charge method will have to be performed first.

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Garmin 305 wont power on, wont charge on cradle


Same thing happened to mine. Put the unit in the cradle (just like you are going to recharge it) and press the reset and mode button at the same time for 3 seconds. This will "wake" the unit up.

Mar 30, 2009 | Garmin Forerunner 305 GPS Receiver

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Low battery, wont' charge in car


I pushed the reset button, on the side,during the brief moment that it stays powered up. Now it is staying on with the wall plug.
I'll let that stay on for a while and then try to keep charging it with it turned off.

Aug 10, 2008 | Magellan MAESTRO 3100 98083401 GPS Device

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Internal battery won't charge


Common issue. Steps to troubleshoot/solve:
1. Pull off face, press reset tab.
2. If unit wont turn on or if turns off immediately, connect to home computer using mini usb on side of gps (any usb cord that fits will do). This will charge the internal gps battery, which is discharged.
3. You will not be able to see the gps charge indicator while the usb cord is plugged into the unit. To check charge level, disconnect it, turn it on, and note the large "battery" icon.
4 Do you have a dead internal battery? If the gps holds a charge from your computer usb port, you don't.
5. If you have a dead battery, Google DIY replacement. With some soldering it can done for $15 total.
6. If you don't have a dead battery, the issue is charging from the cigarette lighter socket. Your car socket may have blown a fuse (check car manual). Your charger unit may have blown a fuse (unscrew the tip, check fuse inside). Also, some car sockets don't work when the ignition is off. Test yours.
7. There is a good chance the connection of the charger wire to the gps cradle is the problem. Fiddle with that. Replacement cradles are available for the c340 at about $25.
8. If your unit is not charging from the cradle/socket, buy a 12v usb cord. Plug into socket and into usb port of the gps. This is a workaround or alternative to buying a new cradle.
9. IMPORTANT: observe the "battery" icon while driving, esp. if you have doubts about charging. Basically, if you can see the icon, you're not connected to an outside (car or computer) power source. That is, if you can see the battery-charge indication, it means your battery is currently discharging and unless you get another power source to work it will be dead in a few hours.

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2 Answers

Ique 3600


This is correct. If you want to use it all the time you will have to get a new battery.

Apr 17, 2007 | Garmin iQue 3600 GPS Receiver

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