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The Goodman B1378700 is a factory 16-pin wiring harness built for the APH1624M41AB heat pump and compatible Goodman/Amana units. It carries low-voltage control and sensor signals between the unit control board and its components through a single keyed connector, so replacement is a clean plug-and-play job. Melted pins, chafed insulation, corroded terminals, or a harness damaged by rodents or heat can trigger intermittent faults, no-heat/no-cool calls, and error codes — a new OEM harness eliminates that failure point.
Universal harnesses require cutting, splicing, and re-pinning, which introduces resistance and moisture-intrusion points that fail again. The genuine Goodman B1378700 arrives pre-terminated with the correct pin-out and wire colors, so it drops straight into the board and mating components with no rewiring.
Easy–Moderate (2 of 5). No splicing needed, but you should photograph routing and connections before removal. Disconnect power at the breaker, unplug the old harness at both ends, route the new one along the original path, and click the connectors home. Roughly 20–40 minutes with basic tools. Verify all power is off before opening the control panel.