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A broken NMEA 2000 connector plug on the back of a Garmin GPSMAP 5212 chartplotter left the unit without GPS signal while anchored in Biscayne Bay aboard a C&C 39.0:55 The plastic connector housing had cracked where the T-fitting plugged into the unit, severing the NMEA 2000 backbone connection to the GPS antenna.1:24 Gordon disassembled the chartplotter by removing perimeter screws — two of which were seized by electrolysis and required left-hand drill bits, a burr grinder, and a cut-off disc to remove — then separated the housing halves and lifted the internal board to access the broken fitting.6:02 He repaired the plastic housing with two-part epoxy and packed the connector with silicone grease, but an incorrect wire-pin soldering pattern prevented GPS lock even after the unit powered on.12:15 A second GPSMAP 5212 sourced from Facebook Marketplace failed to turn on but yielded a usable wire harness; a Klein continuity tester confirmed the correct pin-to-socket orientation.13:36 Swapping in the salvaged harness restored full GPS position and AIS display.15:22 Garmin confirmed it no longer sells replacement parts for this discontinued model.14:20 Correct wire-pin orientation, verified by continuity testing against a donor harness, is the critical step when repairing NMEA 2000 connector plugs on older Garmin units.

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