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The B1378700 is a genuine OEM 16-pin wiring harness for the Goodman/Amana APH1530M41AC package heat pump. It carries the low-voltage and control connections between the unit's control board and its components using the factory 16-position connector. Because the harness is pre-terminated with the correct gauge, colors, and pinout, it drops in without splicing — eliminating the miswire risk that comes with rebuilding connections by hand. Replacing a chafed, heat-damaged, or corroded harness restores reliable communication and clears intermittent control faults.
The OEM harness matches the board's exact pin assignment, wire gauge, and connector keying, so it plugs straight in. Hand-built or universal harnesses invite pinout errors that can damage the control board or components. For control wiring, OEM plug-and-play is the safe route.
Difficulty: Moderate — technician recommended. No refrigerant work. Disconnect power, photograph and label routing, unplug the old harness, and route the new one clear of hot and moving parts. Verify each connector is fully seated before restoring power.