Thanks for all the replies, problem solved
I spoke to Garmin and….To use the device normally when it is connected to an external power source, the device needs to be changed to Garmin Spanner mode:
Open the Main Menu.
Select Setup.
Select System.
Select Interface.
Select Garmin Spanner.
From this point on, when the device is connected to the USB cable, the device will power on with the statement "USB cable detected. Would you like to go to Mass Storage?"
If Yes is selected, the device enters USB mass storage mode, which allows data and updates to be transferred between the computer and device
If No is selected, the device does not enter USB mass storage mode and remains operational while connected to the computer. However, no data or updates can be transferred between the computer and device until the device is unplugged and plugged back in, then Yes selected to enter USB mass storage mode
Whether or not the battery charges while the device is being used on external power depends on the power being supplied to the device. If the power supplied exceeds the power being used, then the excess power will charge the battery.
I don’t know how my Montana changed its setting, possibly my sausage fingers but all is good and tested
Wayne
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