{"product_id":"oem-goodman-16-pin-wiring-harness-for-gmp075-4-b1378700","title":"OEM Goodman 16-Pin Wiring Harness for GMP075-4 — B1378700","description":"\u003ch2\u003eGoodman B1378700 16-Pin Wiring Harness\u003c\/h2\u003e\u003cp\u003eThe Goodman \u003cstrong\u003eB1378700\u003c\/strong\u003e is a genuine OEM 16-pin wiring harness engineered as a direct-fit replacement for the \u003cstrong\u003eGMP075-4\u003c\/strong\u003e gas furnace. This multi-pin connector loom links the integrated furnace control board to the blower, limit switches, gas valve, and ignition circuit, delivering reliable low-voltage signal transfer throughout the appliance. Over years of thermal cycling, factory harnesses can develop brittle insulation, corroded terminals, or a cracked connector housing that produces intermittent no-heat faults and error codes — replacing the harness restores clean, stable connections.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e B1378700\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector:\u003c\/strong\u003e 16-pin plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit:\u003c\/strong\u003e Goodman GMP075-4 gas furnace\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Low-voltage control wiring harness\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Goodman OEM\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThis is the \u003cstrong\u003egenuine Goodman OEM harness\u003c\/strong\u003e, built to exact factory pin-out, wire gauge, and connector keying so it seats correctly the first time with no splicing or re-pinning. Aftermarket universal harnesses often require cutting and crimping, risk mismatched pin assignments, and can void equipment warranties. For guaranteed compatibility and a plug-and-play install, the OEM part is the safe choice.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate.\u003c\/strong\u003e Requires disconnecting power at the breaker, removing the furnace access panel, and unplugging\/re-seating keyed connectors. Photograph existing routing before removal. Most experienced DIYers complete the swap in 20–30 minutes; if you are unsure, consult a licensed HVAC technician.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eAlways shut off electrical power and gas supply before servicing your furnace.\u003c\/em\u003e\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058135581043,"sku":"GOODMAN-11855","price":18.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-16-pin-wiring-harness-for-gmp075-4-b1378700","provider":"National HVAC Parts","version":"1.0","type":"link"}