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The Goodman B1378701 5-Pin Wiring Harness is the genuine OEM connector harness for the APH1560M41AB packaged heat pump. This factory-terminated harness links a specific subassembly — such as the motor, sensor, or reversing-valve circuit — to the control board through a keyed 5-position connector. When pins corrode, terminals loosen, or the connector body cracks, the result is intermittent operation or a component that won't energize. Swapping in the exact OEM harness restores solid, correctly-keyed connections without field splices.
The B1378701 comes pre-pinned with the correct terminals, colors, and lead length for a direct plug-in fit. A hand-built or universal harness risks a wrong pinout and weak crimps that fail under vibration. The OEM part is the reliable, plug-and-play repair.
Easy–Moderate (2/5). Disconnect power, note the routing, unplug the old harness at both keyed ends, install the replacement along the same path, and reconnect. About 15–30 minutes; confirm connector locations against the unit's wiring diagram.