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A quick blow (fast-acting) fuse is used in all Garmin power cables. The maximum amperage in the fuse can vary between the different devices. For the specifications of the fuse, you can view the sticker on the cable. If you are unable to locate this information on the cable, please consult the owners manual for your device at the following link: https://buy.garmin.com/support/manuals/searchManuals.faces?refresh=true
If you unscrew the cigarette lighter end of the power cable the fuse should come out. With newer cables that do not unscrew at the end:
If the fuse is blackened, burned or the filament inside the fuse is broken the fuse will need to be replaced. If you are unable to tell if the fuse is blown it can also be checked using a multimeter or continuity tester.
If the fuse has been damaged and needs to be replaced, remove the fuse from the cable. The voltage and amperage is stamped onto one of the metal ends of the fuse. This style of fuse can be obtained from most electronic or automobile stores.
you may have to update the Garmin with the latest firmware
click the link below
let me know if you have any question.