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The B1378700 is a genuine Goodman 16-pin wiring harness built as a direct-fit replacement for the APH1524M41AC package heat pump. This harness carries the main low-voltage control connections between the integrated control board and the unit's components, using a keyed 16-position plug so every conductor lands in the correct terminal position.
The OEM harness ships with the correct wire gauge, color coding, connector keying, and lead lengths for the APH15 board layout. There is effectively no true generic equivalent — mismatched pin-outs or hand-splicing risk cross-wiring and board damage. The genuine plug-in harness eliminates guesswork and restores factory connections.
Moderate. Disconnect all power at the breaker, photograph the existing routing, unplug the old harness, and seat the new 16-pin connector until it clicks. Confirm the plug is fully locked and no leads are pinched before restoring power. Comfort with control-board wiring is recommended.
Match verified before shipment. Send your model and serial number to info@nationalhvacparts.com if you need confirmation.