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I recently got ahold of a Garmin Echo 550c which didn't come with a power cable. I was just trying to look for the schematics for this model but can't seem to find any. I can't figure out which of the 4 pins is power and which is ground.
The owner's manual doesn't mention it at all and after taking the cover off I found out there are no wires at all to differentiate. Does anyone have any idea? Attached is a photo.
TIA
 

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