{"product_id":"oem-goodman-wiring-harness-for-gmt090-4a-b1225020","title":"OEM Goodman Wiring Harness for GMT090-4A — B1225020","description":"\u003ch2\u003eGoodman B1225020 Wiring Harness\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eB1225020\u003c\/strong\u003e is a genuine OEM wiring harness for \u003cstrong\u003eGoodman GMT090-4A\u003c\/strong\u003e gas furnaces. This pre-terminated wire loom carries power and control signals between the furnace control board, gas valve, igniter, blower, and safety switches. Insulation that has cracked, melted, or been chewed, or connectors that have corroded, cause intermittent operation, fault codes, or no-heat calls — a fresh harness restores clean, reliable connections.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eType: Pre-terminated furnace control wiring harness\u003c\/li\u003e\n\u003cli\u003eConnectors: Factory-matched plugs and quick-connects\u003c\/li\u003e\n\u003cli\u003eInsulation: High-temperature rated for furnace cabinet use\u003c\/li\u003e\n\u003cli\u003eFunction: Interconnects control board, valve, igniter, and switches\u003c\/li\u003e\n\u003cli\u003eFits: Goodman GMT090-4A furnace\u003c\/li\u003e\n\u003cli\u003eOEM Part Number: B1225020\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eFor a harness we recommend the \u003cstrong\u003eOEM B1225020\u003c\/strong\u003e — the connector pinout, wire colors, gauge, and lead lengths are matched exactly to the GMT090-4A, making it a true plug-and-play swap. Generic replacements almost never match a molded harness; mismatched connectors force splicing, which introduces failure points on a safety-critical circuit.\u003c\/p\u003e\u003ch3\u003eInstall Difficulty: Moderate\u003c\/h3\u003e\u003cp\u003ePlan for 30–45 minutes. Shut off power and gas, then \u003cstrong\u003ephotograph every connection before unplugging anything\u003c\/strong\u003e. Transfer connectors one at a time from old harness to new so nothing is crossed. Route wires away from hot surfaces and moving blower parts, and verify each plug is fully seated before restoring power.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058159403379,"sku":"GOODMAN-12384","price":9.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-wiring-harness-for-gmt090-4a-b1225020","provider":"National HVAC Parts","version":"1.0","type":"link"}