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The B1378700 is a genuine OEM 16-pin control wiring harness for the Goodman/Amana APH1630M41AA heat pump. It carries low-voltage control and sensor signals between the unit's control board and its components through a keyed 16-position connector. Factory-crimped terminals and color-coded leads mean a true plug-and-play swap — eliminating the intermittent faults, melted connectors, and control lockouts caused by corroded pins or chafed insulation.
OEM delivers the correct pin-out, wire gauge, and lead lengths so every circuit lands where it should — no guesswork. A generic harness or hand-built splice risks mis-pinned connections that can damage the control board or trigger nuisance faults. For control wiring, OEM is the safe choice.
Rating: Moderate (Advanced DIY / Pro) — Disconnect power, photograph existing routing, unplug the old harness, route and clip the new one, and reconnect. No brazing, but attention to routing and strain relief is required.