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The Goodman B1378700 16-Pin Wiring Harness is a genuine OEM control harness built as a direct-fit replacement for the Goodman/Amana APH1530M41AB heat pump. This harness carries the low-voltage and control signals between the unit's control board and its components through a keyed 16-position connector. Over time, outdoor exposure, heat, and vibration can crack insulation, corrode terminals, or loosen crimps — causing intermittent faults, no-heat/no-cool calls, or error codes that a simple harness swap resolves.
This genuine OEM harness arrives with the correct wire gauges, colors, terminal types, and factory pinout for a true plug-and-play install. Building a generic harness or splicing individual wires risks miswiring the 16-pin connector, which can damage the control board or components. OEM guarantees the pinout and connector keying match your unit exactly.
Moderate — comfortable DIY or technician. With power disconnected, photograph the existing routing, unplug the keyed 16-pin connector and any inline terminals, remove the old harness, and route the new one along the same path. The keyed connector prevents backward insertion. Verify each end is fully seated before restoring power. Allow 30–45 minutes.