GPS Repair Problems? Ask a GPS Technician for Answers ASAP
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If you use a common house-current wall plug on your Garmin device, then the round (third) prong is the Ground, the narrow straight plug is the Hot (AC voltage), and the broad straight plug is the Neutral (other side of the AC voltage but near to Ground level usually).
If the plug is of some other type, please tell me briefly (or post me a picture) of its shape, please. Thanks.