What are the specs for this Wiring Harness?

The correct replacement for Goodman model GMTH045-3 — 0259F00007P 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 GMTH045-3 — 0259F00007P.

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 12-Pin Wiring Harness for GMTH045-3 — 0259F00007P

Name: OEM Goodman 12-Pin Wiring Harness for GMTH045-3 — 0259F00007P
Brand: Goodman
SKU: GOODMAN-12510
Price: 29.95 USD
Availability: InStock

SKU: GOODMAN-12510 Brand: Goodman

$29.95 $39.95

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Goodman 0259F00007P 12-Pin Wiring Harness

The Goodman 0259F00007P is a genuine OEM 12-pin wiring harness engineered for GMTH045-3 gas furnaces. This factory connector routes low-voltage control signals between the integrated furnace control board and key components such as the gas valve, blower, and safety circuit. A cracked, melted, or corroded harness is a common cause of intermittent no-heat calls and error codes — replacing it with the exact OEM part restores reliable, code-compliant operation.

Specifications

Connector: 12-pin molded plug
OEM Part Number: 0259F00007P
Fits: Goodman GMTH045-3 furnace
Application: Low-voltage control wiring
Material: Heat-rated insulation with keyed connector

OEM vs. Generic

The genuine OEM harness ships with the correct pin count, wire gauge, and color-coded leads pre-terminated — no splicing or guesswork. Generic universal harnesses often require cutting factory connectors and hand-crimping, which introduces failure points and can void warranty coverage. For a furnace control circuit, the exact-fit OEM part is the safest choice.

Installation Difficulty

Easy (1/5) — Plug-and-play replacement. Disconnect power at the breaker, unplug the old harness, route and seat the new connector until it clicks. No wire cutting required. Professional installation is recommended if you are not comfortable working inside a furnace cabinet.

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 12-Pin Wiring Harnes...

$29.95

Frequently Asked Questions

Does this Wiring Harness fit my Goodman GMTH045-3 — 0259F00007P?

Yes. This is the factory-specified OEM wiring harness for the Goodman GMTH045-3 — 0259F00007P. 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 GMTH045-3 — 0259F00007P?

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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