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The Goodman B1378701 is the 5-pin wiring harness for the AEPF18301AA air handler. It links a sub-circuit of the control system with a compact, keyed connector. If you're chasing intermittent operation, melted pins, or corrosion on this connector, a fresh OEM harness restores solid, factory-spec contact without splicing or crimping.
The OEM harness matches Goodman's exact pin spacing and lock-tab geometry for a secure seat. Generic alternatives can fit loosely and back out under vibration, causing nuisance trips. For dependable contact, OEM is the safe call.
About 10–15 minutes. Shut off power at the breaker, unplug the old 5-pin harness, and snap the replacement into place until it locks. No special tools required — an approachable repair for DIYers.