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The Goodman B1378701 is a genuine OEM 5-pin wiring harness built for the APH1536M41BA packaged heat pump. This compact, keyed harness connects a discrete circuit — typically a sensor, reversing valve, or auxiliary control lead — to the unit's main control board. As a factory assembly it delivers a plug-and-play fit with the correct terminals, gauge, and pin-out already in place.
Generic 5-pin cables rarely match the factory keying, so they can be forced in backward and short a control circuit. The OEM B1378701 is keyed to seat only one way and uses factory-spec conductors, protecting the control board and preserving your warranty. For a small, inexpensive control harness, OEM is almost always the right call.
Easy (1/5). Kill power at the disconnect, unplug the old 5-pin harness, and snap the B1378701 into place. The keyed connector prevents misalignment. Restore power and confirm normal operation.
Compatible with APH1536M41BA. Verify your model and part number before ordering.