I have been wondering why no other charger works with a Magellan Maestro 3250 and other models. If you are not using the 'Magellan' charger, it shows that it's connected to the computer with a message: USB Connected - The USB has been connected to the unit. Please follow instructions from PC application for updating maps or software. This is great when actually connected to a computer as it allows you to get rid of the junk navigation software that the unit came with. But when you are trying to USE the unit for navigation this screen blocks the navigation. As an added hassle, the unit reboots as soon as it is disconnected from USB mode. The method that they use to determine if a charger or a standard USB mini-B cable is used all resides in the miniUSB connector. The difference is in the type of miniUSB connector, specifically pin 4, type A=connected to ground, type B=not connected to ground.
- Connect to computer = Standard mini-B connector
- Charge = Next to impossible to find mini-A connector
* NOTE: If you get the USB Connected message while using a Magellan charger, the connector/cable is dirty, warn, or broken.
Repair and Workaround Options:
- Use a Magellan charger(clean the contacts or replace connector if necessary).
- Open the unit and solder USB pins 4 and 5 together or even better, add a switch.
- Modify a mini-B connector by soldering pins 4 and 5 together.
