{"product_id":"oem-goodman-16-pin-wiring-harness-for-gmn120-5-furnace-b1378700","title":"OEM Goodman 16-Pin Wiring Harness for GMN120-5 Furnace — B1378700","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1378700 16-Pin Wiring Harness\u003c\/strong\u003e is a genuine OEM replacement for \u003cstrong\u003eGMN120-5\u003c\/strong\u003e series gas furnaces. This factory-terminated harness carries power and signal between the integrated furnace control board and key components. Melted connectors, chafed insulation, or intermittent no-heat faults are classic signs a harness needs replacing.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: B1378700\u003c\/li\u003e\n\u003cli\u003eConnector: 16-Pin\u003c\/li\u003e\n\u003cli\u003eType: Control Board Wiring Harness\u003c\/li\u003e\n\u003cli\u003eCompatible Model: Goodman GMN120-5\u003c\/li\u003e\n\u003cli\u003eEquipment: Gas Furnace\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThis \u003cstrong\u003egenuine Goodman OEM harness\u003c\/strong\u003e arrives with the correct pinout, wire gauge, and keyed connectors already terminated — no crimping, guessing, or resistance mismatch. Generic aftermarket harnesses often require manual splicing that introduces failure points and voids diagnostic reliability. OEM guarantees a clean, code-compliant connection.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate (3\/5).\u003c\/strong\u003e Straightforward for a comfortable DIYer but demands care. Kill power at the breaker, photograph the existing routing, then unplug the keyed connectors one at a time and transfer. Match the connectors exactly — never force a plug. Allow 20–30 minutes.\u003c\/p\u003e\u003cp\u003eBacked by our fit guarantee. Questions? Contact info@nationalhvacparts.com.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058126733683,"sku":"GOODMAN-11591","price":18.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-16-pin-wiring-harness-for-gmn120-5-furnace-b1378700","provider":"National HVAC Parts","version":"1.0","type":"link"}