What are the specs for this Wiring Harness?

The correct replacement for Goodman model GMNT040-3 — B1378701 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 GMNT040-3 — B1378701.

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 5-Pin Wiring Harness for GMNT040-3 — B1378701

Name: OEM Goodman 5-Pin Wiring Harness for GMNT040-3 — B1378701
Brand: Goodman
SKU: GOODMAN-11609
Price: 22.95 USD
Availability: InStock

SKU: GOODMAN-11609 Brand: Goodman

$22.95 $29.95

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Texas CMBL #19328542014

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The Goodman B1378701 5-Pin Wiring Harness is a genuine OEM plug-and-play wiring assembly for the Goodman/Amana GMNT040-3 gas furnace. This 5-circuit harness provides the correct keyed connection between the furnace control board and its component circuit, letting you replace damaged, overheated, or corroded wiring with a clean factory-terminated loom.

Specifications

Connector: 5-pin keyed plug
Type: Factory-terminated furnace control wiring harness
Conductors: Color-coded, correct-gauge OEM wire
OEM part number: B1378701
Fits: Goodman/Amana GMNT040-3 and compatible furnaces

OEM vs. Generic

The genuine Goodman harness matches the board's connector and pin-out exactly, so it seats securely and carries the correct signals. Improvised replacements risk loose connections and intermittent faults. For control-circuit wiring, OEM delivers dependable, no-guesswork results.

Installation Difficulty

Easy — the keyed connector makes replacement plug-and-play. Disconnect power first, snap a photo of the routing, and swap the harness one connector at a time. No cutting, stripping, or crimping needed.

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 5-Pin Wiring Harness...

$22.95

Frequently Asked Questions

Does this Wiring Harness fit my Goodman GMNT040-3 — B1378701?

Yes. This is the factory-specified OEM wiring harness for the Goodman GMNT040-3 — B1378701. 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 GMNT040-3 — B1378701?

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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