Veteran-owned and operating on Shelter Island since 1986, Marine Electric San Diego in Point Loma has logged over 20,000 completed work orders across vessel electrical systems, onboard electronics, and engine-harness fabrication. Engine-room rewiring and ECU programming for Cummins, Volvo, Yanmar, MTU, and Cat powerplants place the shop alongside marine-service operations like Sea Monster Marine in the Shelter Island boatyard corridor. NMEA 2000 network integration connects chartplotters, radar, autopilots, and AIS transponders into a single helm bus, replacing legacy analog gauges with multiplexed digital dashboards. Custom wiring harnesses built to ABYC safety standards outperform OEM engine-supplier looms by routing conductors through marine-grade tinned copper with adhesive-lined heat-shrink terminations. Offshore-readiness inspections and USCG COI electrical surveys source replacement components through equipment dealers like Shelter Island Marine Electronics at manufacturer-invoice pricing. The shop's highest-value scope is full electrical-system design for new-build and repower projects — schematic drafting, panel fabrication, shore-power and generator integration, and sea-trial commissioning on vessels from sport-fishing yachts to commercial charter boats.