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The B1378701 is a genuine OEM 5-pin wiring harness for the Goodman/Amana APH1530M41AC package heat pump. This shorter harness links a specific subassembly — such as a sensor, switch, or motor lead group — to the unit's control board through the factory 5-position connector. Pre-terminated with the correct wire colors, gauge, and keying, it installs without splicing so the circuit reconnects exactly as designed. Swapping a burned, chafed, or corroded harness is an inexpensive way to cure intermittent faults caused by degraded wiring.
The OEM harness matches the exact pin assignment and connector keying, so it plugs directly in with no guesswork. Universal or hand-spliced substitutes risk reversed connections that can damage components. For control wiring, plug-and-play OEM is the reliable choice.
Difficulty: Moderate — technician recommended. No refrigerant work. Kill power at the disconnect, note the routing, unplug the old harness, and seat the replacement fully while keeping it away from sharp edges and hot surfaces. Confirm the connector locks before restoring power.