What are the specs for this Wiring Harness?

The correct replacement for Goodman model GMT090-4 Furnace — B1225020 is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Goodman equipment which lists the model number GMT090-4 Furnace — B1225020.

What symptoms indicate I need a new wiring harness?

Common symptoms that indicate you need a new wiring harness include unusual noises, intermittent operation, complete failure to operate, or visible damage. For specific diagnostic guidance, visit nationalhvacparts.com/pages/hvac-diagnostic.

Is this wiring harness compatible with Bryant or Payne systems too?

Many Goodman parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

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Goodman

OEM Goodman Wiring Harness for GMT090-4 Furnace — B1225020

Name: OEM Goodman Wiring Harness for GMT090-4 Furnace — B1225020
Brand: Goodman
SKU: GOODMAN-12370
Price: 9.95 USD
Availability: InStock

SKU: GOODMAN-12370 Brand: Goodman

$9.95 $12.99

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Goodman B1225020 Wiring Harness

The Goodman B1225020 is a genuine OEM wiring harness engineered as a direct-fit replacement for GMT090-4 gas furnaces. Over years of heating cycles, factory wiring can suffer from insulation cracking, connector corrosion, and heat fatigue near the burner and control board. This harness restores clean, reliable electrical connections between the control board, gas valve, igniter, and safety switches so your furnace fires and sequences correctly.

Specifications

Genuine Goodman OEM part number: B1225020
Compatible equipment: GMT090-4 gas furnace
Pre-terminated, color-coded conductors with factory connectors
High-temperature insulation rated for furnace cabinet service
Plug-and-play — no splicing or crimping required

OEM vs. Generic

This is the genuine Goodman OEM harness, built to the exact conductor gauge, connector pinout, and length the furnace was designed around. Generic or hand-built harnesses often use undersized wire and loose connectors that can cause intermittent faults, nuisance lockouts, or overheating. Choosing OEM guarantees a factory-correct fit and protects your control board warranty.

Installation Difficulty

Moderate. Replacement is a plug-for-plug swap, but it requires photographing the original routing, disconnecting power at the breaker, and confirming each connector lands on the correct terminal. Most experienced DIYers finish in 30–45 minutes; if you are unsure of the wiring diagram, have an HVAC technician perform the swap.

Always disconnect power before servicing. Verify the part number against your unit's rating plate before ordering.

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $75
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

OEM Goodman Wiring Harness for G...

$9.95

Frequently Asked Questions

Does this Wiring Harness fit my Goodman GMT090-4 Furnace — B1225020?

Yes. This is the factory-specified OEM wiring harness for the Goodman GMT090-4 Furnace — B1225020. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the wiring harness on my Goodman GMT090-4 Furnace — B1225020?

Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.

What symptoms mean I need a new wiring harness?

Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.

Is this wiring harness compatible with Bryant or Payne too?

Many Goodman parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Goodman wiring harness?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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