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The first solution is, of course, to try recharging your Streetpilot III by plugging it in to either your accessory outlet (cigarette lighter) in your car.......or a USB port on your PC. (preferably a USB2 outlet that has a higher power output).
Try charging for at least an hour with the 'other' cord, if the unit won't power up after using the 'first' one.
If the unit STILL won't power up after charging with BOTH cords (for an hour each), then either open the unit and replace the battery, or, sorry....if you're mechanically/electrically challenged......you're best to send your unit in to Garmin for repair, because it could be any number of different problems.
Try the dc plug too (also make sure the battery connections are good in the caste). IF still no power up, the internal battery may be shorted. Lots of info online for replacing the internal battery. Good Luck!
This is a common problem. If you carefully open up the unit with a smallPhillips screwdriver you'll see the PCB against the back (where the batteries are). You'll either see that a screw is missing and need to replace it, or you'll just need to tighten down all the screws. I just did this with my SP3. Mine was missing a screw. I found a suitable replacement, tightened all of them down, and the unit boots right up on battery power only. Good luck!
Try leaving it on for a few days on cig lighter with unit ON. gps III plus has a rechargeable valadium battery soldered to the board on the inside of the unit to hold memory of your waypoints.You can solder a new one in for about 5 buks-it may need a new one but try charging it first
March 2009 I replaced the solder type battery of my GPS III Plus with a battery holder (clip) that a “Basic CR or BR2032 Coin type battery”, without solder connections, that is, they simply clip into place. Replacement batteries can be purchased at less than a $1.00 of E-Bay.
I have a GPSII+ that has a screen problem. Several of the x and y coordinates have failed and I think it is due to condensation in the unit due to hot day temps then cold nights. If I open it and dry out the unit for a while... the display will be better but will not return to full display. Some of the X and Y lines don't work.