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The Goodman B1378701 5-Pin Wiring Harness is a genuine OEM connector harness for the APH1536M41AA heat pump. This pre-assembled harness links a low-voltage component circuit to the control system through a keyed 5-position plug, delivering clean, polarized connections that prevent cross-wiring during service.
Corroded pins, heat-damaged connectors, or broken conductors in the original harness lead to intermittent operation and nuisance faults. Installing the correct OEM harness restores dependable connectivity without splicing or repair.
This genuine OEM harness reproduces the factory pinout, wire colors, gauge, and connector keying exactly, so it drops in without adapters. Generic substitutes risk incorrect keying and gauge, which can cause poor contact or board damage.
Easy–Moderate (2/5). Disconnect power, note the original routing, unplug the old harness, install the replacement along the same path, and confirm both connectors click fully home. A quick low-voltage swap requiring only basic hand tools.